WO2014155611A1 - Broadcast reception device, method for controlling broadcast reception device, broadcast reception program, and computer-readable recording medium - Google Patents

Broadcast reception device, method for controlling broadcast reception device, broadcast reception program, and computer-readable recording medium Download PDF

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Publication number
WO2014155611A1
WO2014155611A1 PCT/JP2013/059290 JP2013059290W WO2014155611A1 WO 2014155611 A1 WO2014155611 A1 WO 2014155611A1 JP 2013059290 W JP2013059290 W JP 2013059290W WO 2014155611 A1 WO2014155611 A1 WO 2014155611A1
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WIPO (PCT)
Prior art keywords
frequency band
filter
frequency
mhz
interval
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PCT/JP2013/059290
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French (fr)
Japanese (ja)
Inventor
智子 土方
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シャープ株式会社
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Priority to PCT/JP2013/059290 priority Critical patent/WO2014155611A1/en
Publication of WO2014155611A1 publication Critical patent/WO2014155611A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits

Definitions

  • the present invention relates to a broadcast receiving apparatus that can receive analog broadcast waves.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 2005-236761 (published on September 2, 2005)”
  • station discrimination is performed without particularly considering the analog signal television system-specific filter. That is, without considering the possibility that there is a television signal having a fixed frequency and a frequency within an adjacent range, the reception setting frequency of the tuner is changed and the television system corresponding to the frequency is detected. Yes. Therefore, when an inappropriate filter is set, an erroneous television system may be detected, and there is a possibility that the search time cannot be generally shortened.
  • FIG. 9 is a diagram illustrating an example of a state in which television signals of channel A (Channel ⁇ ⁇ ⁇ ⁇ ⁇ A) and channel B (Channel ⁇ B) exist adjacent to each other.
  • FIG. 10 is a diagram showing an example of the conventional filter setting and the discrimination result of the television system (color system and sound system).
  • the frequency bands of the television signal A100 of channel A and the television signal B100 of channel B are each 6 MHz, and the interval between the center frequencies of channels A and B is 6 MHz.
  • the conventional television signal receiving apparatus it is possible to set a 6 MHz filter and an 8 MHz filter.
  • the color system and sound system of channel A are “NTSC 3.58” and “MN”, respectively.
  • both a filter having a 6 MHz frequency band (hereinafter referred to as a 6 MHz filter) and a filter having an 8 MHz frequency band (hereinafter referred to as an 8 MHz filter) are set for one channel. After that, the color system and the sound system are discriminated. When it is determined that the color system and sound system of the channel are valid, station registration for the channel is performed.
  • the frequency bands of the television signals A100 and B100 are as shown in FIG. Since it is 6 MHz, a part of the television signal B100 is also filtered. Therefore, a part of the television signal B100 is filtered as a channel A television signal. Therefore, when an 8 MHz filter is set, an erroneous discrimination result different from the valid discrimination result A, such as “NTSC 4.43 / BG”, as the discrimination result of the channel A color system and sound system.
  • the determination result B is obtained.
  • a standard color system and sound system are predetermined for each region or country. For this reason, it is possible to acquire an effective color system and sound system for each channel by setting one type of filter corresponding to these systems.
  • the filter of 8 MHz corresponding to these systems is set in the channel search. Is called.
  • the filter setting of 6 MHz is necessary, and the filter setting of 7 MHz or 8 MHz different from this filter is made, the appropriate color system and sound system are set.
  • the result of discrimination could not be obtained. That is, in the case where the channel search process is performed in an analog broadcasting environment where television signals having a plurality of color systems and sound systems are mixed, there is a possibility that the color system and the sound system are erroneously determined.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a broadcast receiving apparatus and the like capable of improving the detection accuracy of a broadcast system in analog broadcasting.
  • a broadcast receiving device provides: A broadcast receiver capable of receiving analog broadcast waves, Local oscillation frequency detection means for detecting the frequency of each of the plurality of stations; Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station among the frequencies detected by the local oscillation frequency detecting means and the frequency band adjacent to the target frequency band. Filter selection means for selecting a filter having a predetermined frequency band.
  • a control method for a broadcast receiving apparatus includes: A control method for a broadcast receiving apparatus capable of receiving an analog broadcast wave, A local oscillation frequency detection step for detecting a frequency of each of the plurality of stations; Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station and the frequency band adjacent to the target frequency band among the frequencies detected in the local oscillation frequency detection step. And a filter selection step of selecting a filter having a predetermined frequency band.
  • FIG. 1 It is a functional block diagram which shows an example of the broadcast receiver which concerns on one Embodiment of this invention. It is a block diagram which shows an example of schematic structure of the said broadcast receiving apparatus.
  • (A) And (b) is a figure which shows an example of a filter table. It is a figure which shows an example of the frequency band for every channel. It is a figure which shows an example of the channel search process in the said broadcast receiving apparatus. It is a figure which shows an example of the channel search process in the said broadcast receiving apparatus. It is a figure which shows an example of the channel search process in the said broadcast receiving apparatus. It is a figure which shows an example of the channel search process in the broadcast receiving apparatus as a comparative example.
  • FIG. It is a figure which shows an example of a processing sequence
  • (a) is a figure which shows the processing sequence of the broadcast receiving apparatus as a comparative example
  • (b) shows the processing sequence of the broadcast receiving apparatus which concerns on one Embodiment of this invention.
  • FIG. It is a figure for demonstrating a prior art, and is a figure which shows an example of a mode that the television signal of the channel A (Channel A) and the channel B (Channel B) exists adjacently.
  • (A) And (b) is a figure which shows an example of the conventional filter setting and the discrimination
  • FIG. 2 is a block diagram illustrating a schematic configuration of the broadcast receiving apparatus 1.
  • the broadcast receiving device 1 is a device capable of receiving analog broadcast compatible television signals (analog broadcast waves). As shown in FIG. 2, the antenna 2, the tuner 3, the video / audio processing circuit 4, the control unit 5, and A storage unit 6 is provided.
  • the antenna 2 is a member that receives a television signal, is connected to the tuner 3, and transmits the received television signal to the tuner 3.
  • the tuner 3 generates a video signal (CVBS, composite signal) and an audio signal based on the received television signal, and transmits these signals to the video / audio processing circuit 4.
  • the tuner 3 includes an IF conversion processing circuit 31, a filter setting circuit 32, and an analog demodulation processing circuit (demodulation circuit) 33 in order to perform the processing.
  • the IF conversion processing circuit 31 converts an RF (radio frequency) signal that is a received television signal into an IF (intermediate frequency) signal, and transmits the IF signal to the filter setting circuit 32.
  • the filter setting circuit 32 uses an IF filter so that only the IF signal within a specific frequency band of the IF signal is used so that the subsequent analog demodulation processing circuit 33 can process the received IF signal. It is to pass through.
  • the IF signal that has passed through the IF filter is transmitted to the analog demodulation processing circuit 33.
  • the analog demodulation processing circuit 33 performs demodulation processing on the received IF signal to generate the above-described video signal and audio signal (collectively referred to as a demodulated signal), and uses the demodulated signal as video / audio. Transmit to the processing circuit 4. That is, the analog demodulation processing circuit 33 is a member that performs signal conversion processing from an IF signal to a demodulated signal.
  • the tuner 3 receives a television signal corresponding to each of a plurality of channels via the antenna 2 at the time of channel search. That is, the tuner 3 detects a frequency band possessed by each of the plurality of stations as a television signal.
  • a filter (tuner filter) having a frequency band suitable for each broadcasting system is connected to the analog demodulation processing circuit 33. After that, it is necessary to determine the broadcasting system of the signal in the color / sound discrimination processing circuit 41 in the subsequent stage.
  • the correspondence between each broadcasting system and the frequency band of the filter is determined in advance. Therefore, when a filter having a frequency band not corresponding to the broadcasting system is applied to a television signal defined by a certain broadcasting system, that is, when an inappropriate filter setting is performed, Depending on the reception status of the television signal, there is a possibility that a desired discrimination result cannot be obtained as a subsequent broadcast format discrimination result (does not match the broadcast format specified in the television signal).
  • channel filters for example, all filters of 6 MHz, 7 MHz, and 8 MHz
  • the target frequency band the demodulated signal included in the band
  • the analog demodulation processing circuit 33 after all the frequency bands (channels) having the stations are detected, (1) the center frequencies of the frequency bands of the detected television signal are determined. (2) calculating the interval between the center frequency of the target frequency band that is the target of channel search (target for determining the broadcasting system) and the center frequency of the frequency band adjacent to the target frequency band, and (3) A filter that acts on the demodulated signal is selected and set according to the interval.
  • a filter corresponding to the broadcasting system can be appropriately selected for each channel, so that the broadcasting system can be accurately determined even in a situation where the television signal is mixed. It becomes possible. That is, it is possible to improve the detection accuracy of the broadcasting system in analog broadcasting.
  • the selected filter is described as being applied to the demodulated signal converted from the IF signal, but the filter may be applied to the IF signal.
  • the broadcasting system and a predetermined frequency band of the filter. That is, as a broadcasting system (color system / sound system) that requires 7 MHz or 8 MHz filter setting, for example, PAL / BG, PAL / DK, PAL / I, SECAM / BG, SECAL / DK, SECAM / I, NTSC4 .43 / BG, NTSC 4.43 / DK, NTSC 4.43 / I, SECAM / L, SECAM / L ′.
  • a broadcasting system color system / sound system
  • examples of broadcast systems (color system / sound system) that require 6 MHz filter settings include NTSC 3.58 / MN and PAL / MN.
  • the tuner 3 is described as including the IF conversion processing circuit 31, the filter setting circuit 32, and the analog demodulation processing circuit 33.
  • the present invention is not limited to this, and the functions of the three processing circuits are described. It only has to have.
  • the tuner 3 may not be configured to include these processing circuits separately, but may be configured from, for example, one IC chip having the functions of these circuits.
  • two of the IF conversion processing circuit 31, the filter setting circuit 32, and the analog demodulation processing circuit 33 may be composed of the same IC chip.
  • the IF conversion processing circuit 31 and the filter setting circuit 32 may be configured by one circuit (tuner unit), and the tuner 3 may include the tuner unit and the analog demodulation processing circuit 33.
  • the filter setting circuit 32 and the analog demodulation processing circuit 33 may be configured by one circuit (analog demodulation unit), and the tuner 3 may include the analog demodulation unit and the IF conversion processing circuit 31. .
  • the video / audio processing circuit 4 performs various processes on the demodulated signal transmitted from the analog demodulation processing circuit 33 of the tuner 3.
  • the video / audio processing circuit 4 includes a color / sound discrimination processing circuit 41, a video encoder 42, an audio encoder 43, and a signal output circuit 44 in order to perform the processing.
  • the color / sound discrimination processing circuit 41 discriminates a color system and a sound system which are broadcast systems of demodulated signals, and performs station registration.
  • the color / sound discrimination processing circuit 41 transmits the video signal after station registration to the video encoder 42 and transmits the audio signal to the audio encoder 43.
  • the video encoder 42 performs encoding processing on the video signal
  • the audio encoder 43 performs encoding processing on the audio signal.
  • the signal output circuit 44 transmits the decoded video signal and audio signal as AV signals to, for example, a VRAM (Video Random Access Memory) (not shown) connected to the subsequent stage.
  • VRAM Video Random Access Memory
  • video display by a display device (not shown) and audio output by a speaker (not shown) are possible.
  • the control unit 5 performs various processing such as processing of each member by reading and executing the program stored in the storage unit 6 into a temporary recording unit (not shown) configured by, for example, a RAM or the like.
  • the storage unit 6 records a control program, an application program, and the like of each unit executed by the control unit 5.
  • the storage unit 6 is configured by a non-volatile recording device such as a ROM (Read Only Memory) flash memory.
  • the temporary storage unit described above is configured by a volatile recording device such as a RAM, but the storage unit 6 may also have a function of a temporary storage unit.
  • FIG. 1 is a functional block diagram showing an example of a broadcast receiving apparatus 1 according to the present embodiment.
  • the channel search process local frequency determination process when scanning a television signal and broadcast system determination process
  • the control unit 5 mainly includes a tuner control unit 50 and a video / audio processing circuit control unit 60.
  • the tuner control unit 50 gives a command to each circuit included in the tuner 3 to control processing of each circuit.
  • the tuner control unit 50 mainly includes a local oscillation frequency detection unit (local oscillation frequency detection unit) 51, a station setting unit 52, a frequency interval calculation unit 53, a filter selection unit (filter selection unit) 54, and a filter setting unit 55. Yes.
  • the local oscillation frequency detector 51 detects the frequency of each of the plurality of stations. Specifically, the local oscillation frequency detector 51 uses AFC or AFT to detect a frequency band that may be set in the tuner 3 in the entire frequency range in which a television signal may exist. Then, the local oscillation frequency detection unit 51 confirms whether the station exists within a certain frequency range before and after the frequency set in the tuner 3. The existence of this station is confirmed by checking whether or not the television signal within a certain frequency range before and after the frequency set in the tuner 3 has an ATV (Analog Television) signal defined by a predetermined broadcasting system. When the ATV signal is present, this is performed by detecting how far the frequency set in the tuner 3 and the local oscillation frequency (local oscillation frequency) are separated.
  • ATV Analog Television
  • the tuner 3 is reset to the original local oscillation frequency, and the presence or absence of the ATV signal is determined again. It is determined that the frequency band has a station, and the frequency band is associated with the station and stored in the storage unit 6.
  • the station setting unit 52 sets a frequency band having a station as a target frequency band for the tuner 3. Specifically, the station setting unit 52 sequentially reads out each frequency band stored in the storage unit 6 and sets it as a target frequency band.
  • the frequency interval calculation unit 53 detects all the center frequencies of the frequency band having the stations stored in the storage unit 6, and (1) the interval between adjacent center frequencies, and (2) the lowest frequency in the entire frequency range. , The interval between the lowest frequency (for example, 45 MHz) and the adjacent center frequency, and (3) the highest frequency (for example, 860 MHz) in the entire frequency range and the interval between the highest frequency and the adjacent center frequency. Then, the calculation result is stored in the storage unit 6.
  • the interval is calculated using the center frequency of each frequency band.
  • the present invention is not limited to this, and the interval may be calculated using frequencies that exist at the same position in each frequency band. .
  • the center frequency can be easily detected with an accuracy of about 10 to 25 kHz, it is more efficient to perform the above calculation using the center frequency.
  • the filter selection unit 54 includes a target frequency band that is a frequency band having the detected station among the frequencies detected by the local oscillation frequency detection unit 51, and a frequency band adjacent to the target frequency band calculated by the frequency interval calculation unit 53. In accordance with the interval, a filter (filter bandwidth) having a predetermined frequency band to be applied to the target frequency band is selected.
  • the predetermined frequency band included in the plurality of filters that may be set in the analog demodulation processing circuit 33 is (1) the center frequency of the target frequency band and the target frequency band adjacent to the target frequency band.
  • a first interval with a center frequency (or lowest frequency) of a low adjacent frequency band, which is a lower frequency band, and (2) a center frequency of the target frequency band and higher than the target frequency band adjacent to the target frequency band It is stored in the storage unit 6 in association with the second interval from the center frequency (or highest frequency) of the high adjacent frequency band that is the frequency band. Therefore, the filter selection unit 54 reads the data indicating the first interval and the second interval among the intervals of the frequencies calculated by the frequency interval calculation unit 53, and then reads the first interval and the second interval. Is determined as a filter to be set in the analog demodulation processing circuit 33.
  • the filter selection unit 54 may select a filter having a frequency band that matches a frequency band set in advance for each region as a filter that acts on the target frequency band. Good.
  • the broadcasting system is preset for each region.
  • the filter selection unit 54 associates the selected filter with the standard broadcast method by setting the broadcast method (standard broadcast method) for each region in advance at the installation position of the broadcast receiving device 1. It is possible to determine whether there is a match with the frequency band of the selected filter. Therefore, even when a plurality of filters are selected, the filters can be uniquely selected thereafter.
  • the filter setting unit 55 sets the filter selected by the filter selection unit 54 in the analog demodulation processing circuit 33. When the filter setting for the analog demodulation processing circuit 33 is completed, the filter setting unit 55 notifies the system determination unit (broadcast method determination means) 61 to that effect.
  • the video / audio processing circuit control unit 60 gives a command to each circuit included in the video / audio processing circuit 4 and controls processing of each circuit. In the present embodiment, the control of the color / sound discrimination processing circuit 41 included in the video / audio processing circuit 4 will be specifically described.
  • the video / audio processing circuit control unit 60 mainly includes a system discrimination unit 61 and a station registration processing unit 62.
  • the system discriminating unit 61 When the system discriminating unit 61 receives the notification of the completion of the filter setting to the analog demodulation processing circuit 33, it confirms that the color / sound discrimination processing circuit 41 has received the demodulated signal from the analog demodulation processing circuit 33. When the confirmation is made, the system discriminating unit 61 discriminates the broadcast system of the demodulated signal received by the color / sound discrimination processing circuit 41 and transmits the discrimination result to the station registration processing unit 62.
  • the system determination unit 61 determines whether the television signal (analog signal) received from the analog demodulation processing circuit 33 is an effective color system (PAL / SECAM / NTSC) or an effective sound system (BG / DK). / I / MN / L / L ′), and if a valid system can be obtained for both the color system and the sound system, the determination result is transmitted to the station registration processing unit 62.
  • PAL / SECAM / NTSC effective color system
  • BG / DK effective sound system
  • the station registration processing unit 62 performs station registration of the frequency band (target frequency band) where the broadcasting system is determined. On the other hand, the station registration processing unit 62 does not perform station registration of the frequency band for which the broadcasting method is determined when the determination result indicates that an effective broadcasting method has not been acquired.
  • the filter selection unit 54 selects a filter to be applied to the target frequency band based on the first interval and the second interval.
  • An example of the correspondence between the frequency band of the filter and the first and second intervals will be described with reference to FIG.
  • FIG. 3 is a diagram showing an example of this correspondence relationship, where (a) shows an example of the filter table T1, and (b) shows an example of the filter table T2. Note that “6M”, “7M”, and “8M” in the filter tables T1 and T2 indicate “6 MHz filter”, “7 MHz filter”, and “8 MHz filter”.
  • the filter table T1 shown in FIG. 3A is a table showing the above-described correspondence in the current VHF (Very High Frequency) method.
  • a filter table T2 shown in (b) of FIG. 3 is a table showing the correspondence relationship in the current UHF (Ultra High Frequency) system.
  • the vertical axis is the first interval (Lower-Target), and the horizontal axis is the second interval (Target-Upper).
  • the frequency band of the filter is set so that the selected filter does not filter a part of the television signal included in the adjacent frequency band.
  • the filter tables T1 and T2 are stored in the storage unit 6. Therefore, when the filter selection unit 54 reads the data indicating the two intervals that are the first interval and the second interval, the filter selection unit 54 determines whether the antenna 2 is the VHF method or the UHF method according to the frequency of the television signal received. By referring to the filter table T1 or T2, it is possible to select any of 6 MHz, 7 MHz, and 8 MHz filters corresponding to the first interval and the second interval.
  • the filter table T1 as a filter corresponding to the first interval of “6.5 or more and less than 7” and the second interval of “7 or more and less than 7.5”, “6 MHz filter or 7 MHz filter (6M / 7M) ”. That is, in the filter tables T1 and T2, a plurality of filters (“6 MHz filter or 7 MHz filter (6M / 7M)”, “6 MHz filter, 7 MHz filter, or 8 MHz filter (6M / 7M) are selectable filters. / 8M) ”and“ 6 MHz filter or 8 MHz filter (6M / 8M) ”) are set (shaded portions in FIGS. 3A and 3B). That is, when a value corresponding to the shaded portion of the first interval and the second interval is reached, there are a plurality of filters that can be applied to the target frequency band.
  • the filter selection unit 54 selects a filter having a frequency band that matches the frequency band set for each region as a filter that acts on the target frequency band. Thereby, a filter with high possibility of being appropriate can be selected.
  • the broadcasting method may be determined by applying each filter to the target frequency band, but the channel search processing time can be shortened by selecting the filter using the frequency band for each region as described above. It becomes possible to plan.
  • FIG. 4 is a diagram illustrating an example of a frequency band for each channel.
  • the example shown in FIG. 4 shows a case where there are three frequency bands having a station, which are stored in the storage unit 6 by the local oscillation frequency detection unit 51.
  • the target frequency band (Target Channel) is channel B1
  • the lower frequency band (low adjacent frequency band, Lower Channel) is channel A1
  • the higher frequency band (high adjacent frequency band, UpperUpChannel) is defined as channel C1.
  • the received television signals A11, B11, and C11 are UHF.
  • the lower frequency band adjacent to the target frequency band becomes the low adjacent frequency band
  • the higher frequency band adjacent to the target frequency band is the high adjacent frequency band. Further, all the frequency bands having the plurality of stations are sequentially selected as the target frequency band.
  • the frequency interval calculation unit 53 detects the center frequencies Ac, Bc, and Cc of the channels A1, B1, and C1, respectively. Then, an interval ⁇ 0 between the lowest frequency and the center frequency Ac, an interval ⁇ 1 between the center frequencies Ac and Bc, an interval ⁇ 2 between the center frequencies Bc and Cc, and an interval ⁇ 3 between the center frequency Cc and the highest frequency are calculated.
  • the “6 MHz filter” of the corresponding part (the thick frame part shown in FIG. 3B) is determined as the filter to be selected.
  • FIG. 5 is a diagram illustrating an example of channel search processing in the broadcast receiving apparatus 1.
  • the local oscillation frequency detection unit 51 uses the AFC or AFT, and the difference between the frequency set in the tuner 3 and the local oscillation frequency in the entire frequency range where the television signal may exist. Is repeated, and the control to reset the detected local oscillation frequency to the tuner 3 is repeated, so that an accurate local oscillation frequency is obtained and it is determined whether or not a frequency band having a station exists (S1).
  • S1 Local oscillation frequency detection step
  • the local oscillation frequency detector 51 sets a frequency in the tuner 3 (S1), and confirms whether a station exists within a certain range from the set frequency (tuner set frequency) (S2). . If it is determined that a station exists within a certain range (YES in S2), a local oscillation frequency (local oscillation frequency) is acquired (S3), and the tuner 3 is set to the local oscillation frequency (S4). Then, the presence / absence of the ATV signal is determined again to determine whether or not a frequency band (station frequency) having a station exists (S5).
  • the local oscillation frequency detection unit 51 determines that there is a frequency band having a station, the local oscillation frequency detection unit 51 stores the frequency band (local frequency) in the storage unit 6 (S6). Thereafter, it is determined whether or not the frequency band has been detected up to the highest frequency in the entire frequency range (that is, in the entire frequency range) (S7). If the detection is completed, the local oscillation frequency detection unit 51 is detected. The process by is terminated. At this time, the local oscillation frequency detection unit 51 notifies the station setting unit 52 that its own processing has been completed.
  • the detection of all the frequency bands having the station is completed before the filter setting and the broadcasting method are determined.
  • the station setting unit 52 Upon receiving the completion notification from the local oscillation frequency detection unit 51, the station setting unit 52 sets one of the detected frequency bands having the station as a target frequency band in the tuner 3 as shown in FIG. (S11), to that effect is notified to the frequency interval calculation unit 53.
  • the frequency interval calculation unit 53 calculates the interval between the center frequencies described above (S12). Then, the calculation result is stored in the storage unit 6 and the filter selection unit 54 is notified that the calculation of the interval is completed. In addition, the order of the process of S11 and the process of S12 is not ask
  • the filter selection unit 54 When the filter selection unit 54 receives the above notification from the frequency interval calculation unit 53, the filter selection unit 54 reads data indicating the first interval and the second interval from the storage unit 6, and refers to the filter table T1 or T2. A filter (filter to be applied) having a frequency band corresponding to the first interval and the second interval is selected (S13: filter selection step).
  • the filter selection unit 54 determines whether or not there is one type of selected filter (S14), and if it is one type (YES in S14), notifies the filter setting unit 55 to that effect. To do. Upon receiving this notification, the filter setting unit 55 sets the filter selected by the filter selection unit 54 as a filter used in the analog demodulation processing circuit 33 (S16).
  • a frequency band that matches the frequency band for the standard broadcasting system set in advance for each region (country) is selected from the filters selected in S14.
  • the filter is selected (S15), and a notification to that effect is sent to the filter setting unit 55.
  • the filter setting unit 55 sets the filter selected by the filter selection unit 54 in the analog demodulation processing circuit 33 (S16).
  • the system discrimination unit 61 discriminates the broadcast system of the demodulated signal received by the color / sound discrimination processing circuit 41 from the analog demodulation processing circuit 33 (S17). If it is determined that the correspondence between the determination result and the frequency band of the selected filter matches the specified correspondence, that is, it is determined that the broadcasting system (color system and sound system) is effective. If so (YES in S17), the station registration processing unit 62 is notified of this. Upon receiving this notification, the station registration processing unit 62 performs station registration in the target frequency band (S18).
  • the system determination unit 61 notifies the station registration processing unit 62 to that effect.
  • the station registration processing unit 62 does not register the target frequency band (S19).
  • the station registration processing unit 62 checks whether all the station registration processing is completed (S20). For example, the station registration processing unit 62 determines whether or not the frequency band stored in the storage unit 6 and having the station closest to the highest frequency in the entire frequency range is the target frequency band. Confirm whether all the station registration processes are completed.
  • the channel search process is terminated. On the other hand, if there is a frequency band that has not yet been set as the target frequency band (NO in S20), the process returns to S11, and one of the frequency bands is set in the tuner 3 as the target frequency band.
  • FIG. 7 is a diagram illustrating an example of channel search processing in a broadcast receiving apparatus as a comparative example.
  • FIG. 8 is a diagram illustrating an example of a processing sequence, (a) is a diagram illustrating a processing sequence 110 of a broadcast receiving apparatus as a comparative example, and (b) is a diagram illustrating a processing sequence 11 of the broadcast receiving apparatus 1. is there. It is assumed that the broadcast receiving apparatus as the comparative example can set a 6 MHz filter and an 8 MHz filter for the analog demodulation processing circuit.
  • a 6 MHz filter is first set in the analog demodulation processing circuit (S103), and the broadcast system (color system and sound) of the demodulated signal output from the analog demodulation processing circuit is set. It is confirmed whether or not (system) is valid (S104).
  • the television signal having the set frequency band can be confirmed to be a valid signal (S111), and station registration for the frequency band is performed. (S106).
  • the broadcasting system is not valid (NO in S110)
  • there is no settable filter there is no settable filter, and station registration of the detected frequency band is not performed (S112).
  • the station registration process (S106 or S112 process) is a station registration process for a frequency band closest to the highest frequency in the entire frequency range (S107). If it is the station registration process for the frequency band (YES in S107), there is no more frequency band that can be set, and the channel search process is terminated. On the other hand, if it is not the station registration process for the frequency band (NO in S107), since there is still a settable frequency band, the process returns to the process of S101 to detect one next local oscillation frequency, The process after S102 is performed.
  • FIG. 8A shows a processing sequence 110 when the processing of FIG. 7 is performed in the order of the frequency bands of AAA MHz, BBB MHz, and CCC MHz
  • FIG. 8B shows FIG. 7 shows a processing sequence 11 when the processing of FIG. 6 is performed for the frequency bands of AAA MHz, BBB MHz, and CCC MHz.
  • the AAA ⁇ ⁇ ⁇ ⁇ ⁇ MHz channel search is started (“channel search AAA MHz” in the processing sequence 110). That is, when it is confirmed that a station exists in the AAA MHz frequency band, a 6 MHz filter is set in the analog demodulation processing circuit ("6 MHz band filter setting" in the processing sequence 110), and then a broadcasting system (color system and sound system). ) Is valid (“color discrimination / sound discrimination” in the processing sequence 110).
  • the 8 MHz filter is set in the analog demodulation processing circuit (“8 MHz band filter setting” in the processing sequence 110), and then the broadcasting system (color system and sound is set again). Check whether the system is valid.
  • the above processing is performed in the order of the BBBBMHz frequency band and the CCC MHz frequency band. That is, in the comparative example, there is a possibility that both the 6 MHz filter and the 8 MHz filter are applied for each frequency band, and the broadcasting system for each filter is determined.
  • the channel search process when the channel search process is started, first, from the lowest frequency where the station may exist to the highest frequency. Between the local oscillation frequencies of AAA MHz, BBB MHz, and CCC MHz, and the local oscillation frequencies of AAA (MHz, CCC MHz are acquired ("channel search AAA MHz" and "channel search of processing sequence 11"). BBB MHz ",” Channel search CCC MHz ").
  • a filter to be applied to the AAA MHz frequency band is selected based on the interval between adjacent frequency bands. Specifically, the minimum frequency, the maximum frequency, and the interval with the center frequency of each frequency band of AAA MHz to CCC MHz are calculated. Of the intervals, the filter table T1 or T2 is defined by setting the interval between the center frequency of AAA ⁇ MHz and the lowest frequency as the first interval, and the interval between the center frequency of AAA MHz and the center frequency of BBB MHz as the second interval.
  • a 6 MHz filter suitable as a fill to be applied to the AAA MHz frequency band is selected ("filter selection (6 MHz filter selection) in processing sequence 11").
  • an 8 MHz filter is selected as a filter suitable for the BBB MHz frequency band based on the interval between the adjacent frequency bands and the filter that acts on the BBB MHz frequency band ("Filter selection ( 8 MHz filter selection))), and the filter is set ("8 MHz band filter setting" in the processing sequence 11). Then, it is confirmed whether or not the broadcasting system (color system and sound system) is valid ("color discrimination / sound discrimination" in the processing sequence 11).
  • a filter of 6 MHz and 8 MHz is selected as a filter suitable for the frequency band of CCC MHz based on the interval between the adjacent frequency bands for the filter that operates on the frequency band of CCC MHz ("processing sequence 11" Filter selection (6 MHz and 8 MHz filter selection) ").
  • processing sequence 11 Filter selection (6 MHz and 8 MHz filter selection) ".
  • a 6 MHz filter is first set ("6 MHz band filter setting" in the processing sequence 11), and it is confirmed whether or not the broadcasting system (color system and sound system) is valid (processing sequence).
  • 11 “Color discrimination / Sound discrimination”.
  • an 8 MHz filter is set (“8 MHz band filter setting” in the processing sequence 11), and whether the broadcasting system (color system and sound system) is valid. Is confirmed ("color discrimination / sound discrimination" in the processing sequence 11).
  • one of 6 MHz and 8 MHz filters is selected using the frequency band set for each region, and the filter of the selected filter is selected. It may be configured to determine the setting and the broadcasting system.
  • the filter is applied to each frequency band. Further, the filter to be applied to each frequency band is selected based on the interval between the frequency band adjacent to the frequency band (target frequency band) for determining the broadcasting system. That is, unlike the comparative example, the station discrimination process and the broadcast system discrimination process are performed separately, such as performing the broadcast system discrimination process for each frequency band after performing the station discrimination process for all frequency bands at the time of channel search. It is carried out at the timing.
  • the broadcast receiving apparatus 1 it is possible to prevent the filter that acts on the target frequency band from acting on a part of the television signal included in the adjacent frequency band. That is, an appropriate filter corresponding to the target frequency band can be selected and operated.
  • the broadcast receiving apparatus 1 it is possible to prevent an inappropriate filter from acting on the target frequency band, and thus it is possible to prevent erroneous determination of the broadcast system that may occur in the comparative example. That is, the broadcast receiving apparatus 1 can determine the broadcast method with higher accuracy than the comparative example. In the broadcast receiving apparatus 1, it is also possible to reduce the processing time that occurs when an inappropriate filter is applied.
  • the broadcast receiving apparatus 1 in an analog broadcasting environment in which a plurality of broadcasting systems are mixed, it is possible to determine the broadcasting system with high accuracy without performing erroneous determination of the broadcasting system by unique filter control as in the past. Can do.
  • the frequency bands having the stations are “534.25 MHz”, “542.25 MHz”, “550.25 MHz”, and “558.25 MHz”.
  • the broadcast receiving device 1 and the comparative example (1) About 200 ms for tuner frequency band setting and station discrimination processing; (2) About 300 ms until a filter is set and a stable signal is extracted, (3) About 200 ms for broadcasting system discrimination It takes a long processing time.
  • the processing of (1) to (3) is performed after all the frequency bands having stations are detected. Therefore, if the time for filter selection processing is added, the channel in the broadcast receiving apparatus 1
  • the processing time can be shortened by about 0.8 seconds at the maximum as compared with the comparative example.
  • the control block (especially each part with which the control part 5 is equipped) of the broadcast receiving apparatus 1 may be implement
  • the broadcast receiving apparatus 1 includes a CPU that executes instructions of a program that is software for realizing each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU).
  • a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like are provided.
  • the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it.
  • a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
  • a transmission medium such as a communication network or a broadcast wave
  • the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
  • the broadcast receiving device (1) includes: A broadcast receiver capable of receiving an analog broadcast wave (television signal), Local oscillation frequency detection means (local oscillation frequency detection unit 51) for detecting the frequency of each of the plurality of stations; Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station among the frequencies detected by the local oscillation frequency detecting means and the frequency band adjacent to the target frequency band.
  • Filter selection means filter selection unit 54 for selecting a filter having a predetermined frequency band.
  • control method of the broadcast receiver (1) is as follows: A control method for a broadcast receiving apparatus capable of receiving an analog broadcast wave, A local oscillation frequency detecting step (S1 to S5) for detecting a frequency of each of the plurality of stations; Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station and the frequency band adjacent to the target frequency band among the frequencies detected in the local oscillation frequency detection step. And a filter selection step (S13) for selecting a filter having a predetermined frequency band.
  • interval of the target frequency band which is a frequency band which has the detected station among the frequencies which each of the detected some station has, and the frequency band adjacent to the said target frequency band A filter having a predetermined frequency band is selected. Therefore, it is possible to prevent the filter that acts on the target frequency band from acting on a part of the analog broadcast wave included in the adjacent frequency band. That is, an appropriate filter corresponding to the target frequency band can be selected and operated.
  • an appropriate filter corresponding to the target frequency band can be selected, so that it is possible to accurately determine the broadcast system. . That is, it is possible to improve the detection accuracy of the broadcasting system in analog broadcasting.
  • an appropriate filter corresponding to the target frequency band can be selected, it is possible to prevent the occurrence of processing such as selecting an appropriate filter again by selecting an inappropriate filter. Therefore, it is possible to shorten the processing time in the channel search.
  • the predetermined frequency band of the filter selected by the filter selecting means is (1) a first interval between a center frequency of the target frequency band and a center frequency of a low adjacent frequency band that is adjacent to the target frequency band and is lower than the target frequency band; and (2) the target And a second interval between the center frequency of the frequency band and the center frequency of the high adjacent frequency band that is adjacent to the target frequency band and is higher than the target frequency band,
  • the filter selection means selects the filter based on the first interval and the second interval.
  • a filter selection means is a 1st space
  • the filter selection means When there are a plurality of the selected filters, the filter selection means preferably causes a filter having a frequency band that matches a frequency band set in advance for each region to act on the target frequency band.
  • a demodulation circuit for demodulating the analog broadcast wave to generate a demodulated signal;
  • the demodulating circuit preferably causes the filter selected by the filter selecting means to act on the demodulated signal included in the target frequency band.
  • the selected filter can be set in the demodulation circuit, and the filter can be applied to the demodulated signal generated in the demodulation circuit. Therefore, it is possible to obtain an appropriate discrimination result in discrimination of the broadcasting system generally performed in the subsequent stage of the demodulation circuit.
  • the demodulating circuit includes a broadcasting system discrimination means for discriminating a broadcasting system of the demodulated signal on which the filter is applied.
  • the broadcast system discrimination means discriminates the broadcast system of the demodulated signal on which the filter selected by the filter selection means is applied. Therefore, since a discrimination result suitable for the demodulated signal can be obtained, station registration in the target frequency region can be performed reliably and accurately.
  • the broadcast receiving apparatus may be realized by a computer.
  • the broadcast receiving apparatus is operated by a computer by causing the computer to operate as each unit included in the broadcast receiving apparatus.
  • a broadcast receiving program of a broadcast receiving apparatus to be realized and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.
  • the broadcast receiving device has a filter bandwidth that acts on the target frequency band according to an interval between the target frequency band and a frequency band adjacent to the target frequency band. It can be said that the configuration is selected.
  • the present invention can be suitably used for a broadcast receiving apparatus that can receive analog broadcast waves defined by a plurality of broadcast stations using different broadcast systems.
  • Analog demodulation processing circuit (demodulation circuit) 51 Local oscillation frequency detector (local oscillation frequency detector) 54 Filter selection section (filter selection means) 61 System discriminator (broadcast system discriminating means)

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Abstract

A broadcast reception device (1) equipped with: a local oscillation frequency detection unit (51) that detects the frequency possessed by each of multiple stations; and a filter selection unit (54) that selects a filter to be applied to a target frequency band, said selection being made in accordance with the intervals between a target frequency band, which is the frequency band of the detected frequencies that is possessed by a detected station, and the frequency bands adjacent to the target frequency band.

Description

放送受信装置、放送受信装置の制御方法、放送受信プログラムおよびコンピュータ読取可能な記録媒体Broadcast receiving apparatus, broadcast receiving apparatus control method, broadcast receiving program, and computer-readable recording medium
　本発明は、アナログ放送波を受信可能な放送受信装置等に関する。 The present invention relates to a broadcast receiving apparatus that can receive analog broadcast waves.
　従来から、アナログ放送の電波受信環境によっては、テレビジョン信号の周波数と規定の周波数との間にずれが生じることがある。そのため、近年のテレビジョン信号受信装置には、オートチューニング機能として、自動的に周波数のずれを吸収するＡＦＴ（Auto Fine Tuning）やＡＦＣ（Auto Frequency Control）等が備えられている。このＡＦＴおよびＡＦＣを備えたテレビジョン信号受信装置の例として、特許文献１が挙げられる。 Conventionally, there may be a deviation between the frequency of the television signal and the specified frequency depending on the radio wave reception environment for analog broadcasting. For this reason, recent television signal receiving apparatuses are equipped with AFT (Auto-Fine-Tuning), AFC (Auto-Frequency Control), etc., which automatically absorb frequency shifts, as an auto-tuning function. As an example of a television signal receiving apparatus provided with this AFT and AFC, Patent Document 1 is cited.
　特許文献１の技術では、設定した標準周波数（固定の周波数）において映像信号が検出された場合のみ音声信号の有無を判断し、且つ音声信号を検出するときに各テレビシステムを順に変更して検索することにより、複数のテレビシステムを考慮して検索時間の短縮を可能にしている。 In the technique of Patent Document 1, the presence / absence of an audio signal is determined only when a video signal is detected at a set standard frequency (fixed frequency), and each TV system is changed in order when detecting the audio signal. By doing so, it is possible to shorten the search time in consideration of a plurality of television systems.
日本国公開特許公報「特開２００５－２３６７６１号公報（２００５年９月２日公開）」Japanese Patent Publication “Japanese Patent Laid-Open No. 2005-236761 (published on September 2, 2005)”
　しかしながら、特許文献１の技術では、アナログ信号のテレビシステム固有のフィルタを特に考慮せずに、局判別を行っている。すなわち、固定の周波数と隣接する範囲内の周波数を有するテレビジョン信号が存在する可能性を考慮せずに、チューナの受信設定周波数を変更して、当該周波数に対応するテレビシステムの検出を行っている。それゆえ、不適切なフィルタが設定された場合には、誤ったテレビシステムが検出される可能性があり、一概に検索時間の短縮が図れない可能性があった。 However, in the technique of Patent Document 1, station discrimination is performed without particularly considering the analog signal television system-specific filter. That is, without considering the possibility that there is a television signal having a fixed frequency and a frequency within an adjacent range, the reception setting frequency of the tuner is changed and the television system corresponding to the frequency is detected. Yes. Therefore, when an inappropriate filter is set, an erroneous television system may be detected, and there is a possibility that the search time cannot be generally shortened.
　すなわち、特許文献１の技術では、複数のテレビシステムが混在するアナログ放送波の受信環境においてチャンネルサーチ処理を行う場合に、固定の周波数による一意的なフィルタ設定により、テレビシステムの誤判別を行ってしまう可能性があった。 That is, in the technique of Patent Document 1, when channel search processing is performed in an analog broadcast wave reception environment in which a plurality of television systems coexist, the television system is erroneously identified by a unique filter setting with a fixed frequency. There was a possibility.
　ここで、図９および図１０に基づいて、従来のチャンネルサーチ（チャンネルスキャン）処理について説明する。図９は、チャンネルＡ（Channel A）およびチャンネルＢ（Channel B）のテレビジョン信号が隣接して存在している様子の一例を示す図である。また、図１０は、従来のフィルタ設定とテレビシステム（カラーシステムおよびサウンドシステム）の判別結果との一例を示す図である。 Here, a conventional channel search (channel scan) process will be described based on FIG. 9 and FIG. FIG. 9 is a diagram illustrating an example of a state in which television signals of channel A (Channel チ ャ ン ネ ル A) and channel B (Channel 隣接 B) exist adjacent to each other. FIG. 10 is a diagram showing an example of the conventional filter setting and the discrimination result of the television system (color system and sound system).
　図９の例では、チャンネルＡのテレビジョン信号Ａ１００とチャンネルＢのテレビジョン信号Ｂ１００との周波数帯域がそれぞれ６ＭＨｚであり、チャンネルＡおよびＢの中心周波数の間隔も６ＭＨｚである。また、従来のテレビジョン信号受信装置では、６ＭＨｚのフィルタおよび８ＭＨｚのフィルタの設定を行うことが可能となっているものとする。また、図９のテレビジョン信号の例では、チャンネルＡのカラーシステムおよびサウンドシステムはそれぞれ「ＮＴＳＣ３．５８」、「ＭＮ」であるとする。 In the example of FIG. 9, the frequency bands of the television signal A100 of channel A and the television signal B100 of channel B are each 6 MHz, and the interval between the center frequencies of channels A and B is 6 MHz. In the conventional television signal receiving apparatus, it is possible to set a 6 MHz filter and an 8 MHz filter. In the example of the television signal in FIG. 9, the color system and sound system of channel A are “NTSC 3.58” and “MN”, respectively.
　従来のテレビジョン受信信号装置では、１つのチャンネルに対して６ＭＨｚの周波数帯域を有するフィルタ（以降、６ＭＨｚのフィルタ）および８ＭＨｚの周波数帯域を有するフィルタ（以降、８ＭＨｚのフィルタ）の両方の設定を行った後に、カラーシステムおよびサウンドシステムの判別を行う。そして、そのチャンネルのカラーシステムおよびサウンドシステムが有効であると判別された場合に、当該チャンネルの局登録を行う。 In a conventional television reception signal apparatus, both a filter having a 6 MHz frequency band (hereinafter referred to as a 6 MHz filter) and a filter having an 8 MHz frequency band (hereinafter referred to as an 8 MHz filter) are set for one channel. After that, the color system and the sound system are discriminated. When it is determined that the color system and sound system of the channel are valid, station registration for the channel is performed.
　例えば、図９に示すチャンネルＡの局登録を行う場合、図１０の（ａ）で示すように、６ＭＨｚのフィルタの設定を行った場合には、当該フィルタの周波数帯域とテレビジョン信号Ａ１００の周波数帯域とが略一致するため、その後のカラーシステムおよびサウンドシステムの判別においては、有効なカラーシステムおよびサウンドシステムを得ることができる。同図の例では、チャンネルＡのカラーシステムおよびサウンドシステムの判別結果として、「ＮＴＳＣ３．５８／ＭＮ」という有効な判別結果（カラーシステム／サウンドシステム）Ａが得られる。 For example, when station registration for channel A shown in FIG. 9 is performed, as shown in FIG. 10A, when a 6 MHz filter is set, the frequency band of the filter and the frequency of the television signal A100 are set. Since the bands substantially coincide with each other, an effective color system and sound system can be obtained in the subsequent determination of the color system and sound system. In the example shown in the figure, an effective discrimination result (color system / sound system) A of “NTSC 3.58 / MN” is obtained as the discrimination result of the color system and sound system of channel A.
　一方、従来のテレビジョン信号受信装置では、図１０の（ｂ）で示すように、８ＭＨｚのフィルタの設定を行った場合には、図９に示すようにテレビジョン信号Ａ１００およびＢ１００の周波数帯域は６ＭＨｚであるため、テレビジョン信号Ｂ１００の一部もあわせてフィルタリングされてしまう。そのため、そのテレビジョン信号Ｂ１００の一部を含めてチャンネルＡのテレビジョン信号としてフィルタリングされてしまう。したがって、８ＭＨｚのフィルタの設定を行った場合には、チャンネルＡのカラーシステムおよびサウンドシステムの判別結果として、上記有効な判別結果Ａとは異なる誤った判別結果、例えば「ＮＴＳＣ４．４３／ＢＧ」などの判別結果Ｂが得られることになる。 On the other hand, in the conventional television signal receiving apparatus, when an 8 MHz filter is set as shown in FIG. 10B, the frequency bands of the television signals A100 and B100 are as shown in FIG. Since it is 6 MHz, a part of the television signal B100 is also filtered. Therefore, a part of the television signal B100 is filtered as a channel A television signal. Therefore, when an 8 MHz filter is set, an erroneous discrimination result different from the valid discrimination result A, such as “NTSC 4.43 / BG”, as the discrimination result of the channel A color system and sound system. The determination result B is obtained.
　この場合、従来のテレビジョン信号受信装置では、チャンネルＡのカラーシステムおよびサウンドシステムの判別結果として、いずれの判別結果を採用するかを判別することができなくなり、誤って判別結果Ｂを採用してしまう可能性があった。 In this case, in the conventional television signal receiving apparatus, it becomes impossible to determine which determination result is adopted as the determination result of the color system and the sound system of channel A, and the determination result B is erroneously adopted. There was a possibility.
　また、上記とは異なり、従来のテレビジョン信号受信装置が、地域または国に応じて設定されている１種類のフィルタを用いる場合には、以下のような問題が生じる可能性がある。 Also, unlike the above, when a conventional television signal receiving apparatus uses one type of filter set according to the region or country, the following problems may occur.
　一般に、地域または国ごとに標準のカラーシステムおよびサウンドシステムが予め決められている。このため、これらのシステムに対応する１種類のフィルタが設定されることにより、チャンネルごとに有効なカラーシステムおよびサウンドシステムを取得することは可能である。 Generally, a standard color system and sound system are predetermined for each region or country. For this reason, it is possible to acquire an effective color system and sound system for each channel by setting one type of filter corresponding to these systems.
　しかし、国境付近の地域またはＳＴＢ（セットトップボックス）からの信号等が同一アンテナ上に混在している場合、特に標準のカラーシステムおよびサウンドシステムとは異なるカラーシステムおよびサウンドシステムで規定された信号が混在している場合には、各テレビジョン信号のカラーシステムおよびサウンドシステムを精度よく判別できない可能性があった。 However, when signals from regions near the border or STB (Set Top Box) are mixed on the same antenna, signals specified by a color system and sound system that are different from the standard color system and sound system in particular. If they are mixed, the color system and sound system of each television signal may not be accurately discriminated.
　例えば、ある国（例えば中国）の標準のカラーシステムおよびサウンドシステムがそれぞれ「ＰＡＬ」、「ＤＫ」に設定されている場合、チャンネルサーチにおいては、これらのシステムに対応する８ＭＨｚのフィルタの設定が行われる。 For example, when the standard color system and sound system of a certain country (for example, China) are set to “PAL” and “DK”, respectively, the filter of 8 MHz corresponding to these systems is set in the channel search. Is called.
　このとき、「ＮＴＳＣ３．５８／ＭＮ」というカラーシステムおよびサウンドシステムで規定された信号（６ＭＨｚのフィルタが適用されるべき信号）が混在した場合には、図１０の（ｂ）に示すように、８ＭＨｚのフィルタの設定によって、当該信号のカラーシステムおよびサウンドシステムを誤って「ＮＴＳＣ４．４３／ＢＧ」などと判別してしまう可能性があった。そして、信号の受信状態によっては、無効なカラーシステムおよびサウンドシステムと判別され、この信号の局登録を行うことができない可能性があった。 At this time, when signals defined by the color system and the sound system of “NTSC 3.58 / MN” (signals to which a 6 MHz filter is to be applied) are mixed, as shown in FIG. Depending on the setting of the 8 MHz filter, the color system and sound system of the signal may be mistakenly identified as “NTSC 4.43 / BG” or the like. Depending on the reception state of the signal, it may be determined that the color system and the sound system are invalid, and there is a possibility that station registration of this signal cannot be performed.
　このように、カラーシステムおよびサウンドシステムの判別において、例えば６ＭＨｚのフィルタ設定が必要である場合に、このフィルタとは異なる７ＭＨｚまたは８ＭＨｚのフィルタ設定がなされた場合には、適切なカラーシステムおよびサウンドシステムの判別結果を得られない可能性があった。すなわち、複数のカラーシステムおよびサウンドシステムを有するテレビジョン信号が混在するアナログ放送環境でチャンネルサーチ処理を行う場合においては、カラーシステムおよびサウンドシステムを誤って判別してしまう可能性があった。 As described above, in the determination of the color system and the sound system, for example, when the filter setting of 6 MHz is necessary, and the filter setting of 7 MHz or 8 MHz different from this filter is made, the appropriate color system and sound system are set. There was a possibility that the result of discrimination could not be obtained. That is, in the case where the channel search process is performed in an analog broadcasting environment where television signals having a plurality of color systems and sound systems are mixed, there is a possibility that the color system and the sound system are erroneously determined.
　アナログ放送が放送されている地域（特に国境付近の地域）では、上述のように、複数の放送局が発信するテレビジョン信号が混信した状態で、テレビジョン信号受信装置が受信する可能性がある。発展途上国などでは未だアナログ放送が主流な地域も多く、アナログ放送の需要は依然として衰えていない。しかし、テレビジョン信号受信装置が備えるオートチューニング機能（自動チャンネルスキャン制御）によっては、上記複数のテレビシステムを正確に判別できず、テレビジョン信号を受信したとき、映像に色が付かない、音が鳴らない、などの問題が発生する場合があった。このように、デジタル放送未普及のアナログ放送地域では、ストレスなくテレビジョン信号を受信できる機能を有する装置が求められている。 In an area where analog broadcasting is broadcast (particularly in the vicinity of the border), as described above, there is a possibility that the television signal receiving apparatus receives the signal while the television signals transmitted from a plurality of broadcasting stations are mixed. . In developing countries, there are many areas where analog broadcasting is still mainstream, and the demand for analog broadcasting has not declined. However, depending on the auto-tuning function (automatic channel scan control) provided in the television signal receiving device, the plurality of television systems cannot be accurately identified, and when the television signal is received, the video is not colored, and there is no sound. There were cases where problems such as not sounding occurred. As described above, in an analog broadcasting area where digital broadcasting is not widely used, a device having a function capable of receiving a television signal without stress is required.
　本発明は、上記の問題点に鑑みてなされたものであって、その目的は、アナログ放送における放送方式の検出精度を向上させることが可能な放送受信装置等を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a broadcast receiving apparatus and the like capable of improving the detection accuracy of a broadcast system in analog broadcasting.
　上記の課題を解決するために、本発明の一態様に係る放送受信装置は、
　アナログ放送波を受信可能な放送受信装置であって、
　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出手段と、
　上記局部発振周波数検出手段が検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択手段と、を備えている。 In order to solve the above problems, a broadcast receiving device according to one aspect of the present invention provides:
A broadcast receiver capable of receiving analog broadcast waves,
Local oscillation frequency detection means for detecting the frequency of each of the plurality of stations;
Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station among the frequencies detected by the local oscillation frequency detecting means and the frequency band adjacent to the target frequency band. Filter selection means for selecting a filter having a predetermined frequency band.
　また、上記の課題を解決するために、本発明の一態様に係る放送受信装置の制御方法は、
　アナログ放送波を受信可能な放送受信装置の制御方法であって、
　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出ステップと、
　上記局部発振周波数検出ステップにおいて検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択ステップと、を含んでいる。 In order to solve the above problem, a control method for a broadcast receiving apparatus according to an aspect of the present invention includes:
A control method for a broadcast receiving apparatus capable of receiving an analog broadcast wave,
A local oscillation frequency detection step for detecting a frequency of each of the plurality of stations;
Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station and the frequency band adjacent to the target frequency band among the frequencies detected in the local oscillation frequency detection step. And a filter selection step of selecting a filter having a predetermined frequency band.
　本発明の一態様によれば、アナログ放送における放送方式の検出精度を向上させるという効果を奏する。 According to one aspect of the present invention, there is an effect of improving the detection accuracy of a broadcasting system in analog broadcasting.
本発明の一実施形態に係る放送受信装置の一例を示す機能ブロック図である。It is a functional block diagram which shows an example of the broadcast receiver which concerns on one Embodiment of this invention. 上記放送受信装置の概略構成の一例を示すブロック図である。It is a block diagram which shows an example of schematic structure of the said broadcast receiving apparatus. （ａ）および（ｂ）はフィルタテーブルの一例を示す図である。(A) And (b) is a figure which shows an example of a filter table. チャンネル毎の周波数帯域の一例を示す図である。It is a figure which shows an example of the frequency band for every channel. 上記放送受信装置におけるチャンネルサーチ処理の一例を示す図である。It is a figure which shows an example of the channel search process in the said broadcast receiving apparatus. 上記放送受信装置におけるチャンネルサーチ処理の一例を示す図である。It is a figure which shows an example of the channel search process in the said broadcast receiving apparatus. 比較例としての放送受信装置におけるチャンネルサーチ処理の一例を示す図である。It is a figure which shows an example of the channel search process in the broadcast receiving apparatus as a comparative example. 処理シーケンスの一例を示す図であり、（ａ）は比較例としての放送受信装置の処理シーケンスを示す図であり、（ｂ）は本発明の一実施形態に係る放送受信装置の処理シーケンスを示す図である。It is a figure which shows an example of a processing sequence, (a) is a figure which shows the processing sequence of the broadcast receiving apparatus as a comparative example, (b) shows the processing sequence of the broadcast receiving apparatus which concerns on one Embodiment of this invention. FIG. 従来技術を説明するための図であり、チャンネルＡ（Channel A）およびチャンネルＢ（Channel B）のテレビジョン信号が隣接して存在している様子の一例を示す図である。It is a figure for demonstrating a prior art, and is a figure which shows an example of a mode that the television signal of the channel A (Channel A) and the channel B (Channel B) exists adjacently. （ａ）および（ｂ）は従来のフィルタ設定とテレビシステムの判別結果との一例を示す図である。(A) And (b) is a figure which shows an example of the conventional filter setting and the discrimination | determination result of a television system.
　以下、本発明の実施の形態について、図１～図８に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS.
　〔放送受信装置１の概略構成〕
　まず、本実施形態に係る放送受信装置１の概略構成について、図２に基づいて説明する。図２は、放送受信装置１の概略構成を示すブロック図である。 [Schematic configuration of broadcast receiving apparatus 1]
First, a schematic configuration of the broadcast receiving apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a schematic configuration of the broadcast receiving apparatus 1.
　放送受信装置１は、アナログ放送対応のテレビジョン信号（アナログ放送波）を受信可能な装置であり、図２に示すように、アンテナ２、チューナ３、映像・音声処理回路４、制御部５および記憶部６を備えている。 The broadcast receiving device 1 is a device capable of receiving analog broadcast compatible television signals (analog broadcast waves). As shown in FIG. 2, the antenna 2, the tuner 3, the video / audio processing circuit 4, the control unit 5, and A storage unit 6 is provided.
　アンテナ２は、テレビジョン信号を受信する部材であり、チューナ３に接続されており、受信したテレビジョン信号をチューナ３に送信する。 The antenna 2 is a member that receives a television signal, is connected to the tuner 3, and transmits the received television signal to the tuner 3.
　チューナ３は、受信したテレビジョン信号に基づく映像信号（ＣＶＢＳ、コンポジット信号）および音声信号を生成し、これらの信号を映像・音声処理回路４に送信する。チューナ３は、当該処理を行うために、ＩＦ変換処理回路３１、フィルタ設定回路３２およびアナログ復調処理回路（復調回路）３３を備えている。 The tuner 3 generates a video signal (CVBS, composite signal) and an audio signal based on the received television signal, and transmits these signals to the video / audio processing circuit 4. The tuner 3 includes an IF conversion processing circuit 31, a filter setting circuit 32, and an analog demodulation processing circuit (demodulation circuit) 33 in order to perform the processing.
　ＩＦ変換処理回路３１は、受信したテレビジョン信号であるＲＦ（無線周波数）信号を、ＩＦ（中間周波数）信号に変換し、当該ＩＦ信号をフィルタ設定回路３２に送信する。 The IF conversion processing circuit 31 converts an RF (radio frequency) signal that is a received television signal into an IF (intermediate frequency) signal, and transmits the IF signal to the filter setting circuit 32.
　フィルタ設定回路３２は、受信したＩＦ信号に対する処理を後段のアナログ復調処理回路３３が行うことが可能なように、ＩＦフィルタを用いて、当該ＩＦ信号のうち特定の周波数帯域内のＩＦ信号のみを通過させるものである。このＩＦフィルタを通過したＩＦ信号が、アナログ復調処理回路３３に送信される。 The filter setting circuit 32 uses an IF filter so that only the IF signal within a specific frequency band of the IF signal is used so that the subsequent analog demodulation processing circuit 33 can process the received IF signal. It is to pass through. The IF signal that has passed through the IF filter is transmitted to the analog demodulation processing circuit 33.
　アナログ復調処理回路３３は、受信したＩＦ信号に対して復調処理を行うことにより、上述の映像信号および音声信号（これらを総称して復調信号とする）を生成し、当該復調信号を映像・音声処理回路４に送信する。すなわち、アナログ復調処理回路３３は、ＩＦ信号から復調信号への信号変換処理を行う部材である。 The analog demodulation processing circuit 33 performs demodulation processing on the received IF signal to generate the above-described video signal and audio signal (collectively referred to as a demodulated signal), and uses the demodulated signal as video / audio. Transmit to the processing circuit 4. That is, the analog demodulation processing circuit 33 is a member that performs signal conversion processing from an IF signal to a demodulated signal.
　また、チューナ３は、チャンネルサーチ時に、アンテナ２を介して、複数のチャンネルのそれぞれに対応するテレビジョン信号を受信する。すなわち、チューナ３は、複数の局のそれぞれが有する周波数帯域をテレビジョン信号として検出している。 The tuner 3 receives a television signal corresponding to each of a plurality of channels via the antenna 2 at the time of channel search. That is, the tuner 3 detects a frequency band possessed by each of the plurality of stations as a television signal.
　ここで、異なる放送方式（カラーシステムおよびサウンドシステム）で規定されたテレビジョン信号が混在している環境においては、各放送方式に適した周波数帯域を有するフィルタ（チューナフィルタ）をアナログ復調処理回路３３に設定した上で、後段のカラー・サウンド判別処理回路４１において当該信号の放送方式の判別を行う必要がある。 Here, in an environment where television signals defined by different broadcasting systems (color system and sound system) are mixed, a filter (tuner filter) having a frequency band suitable for each broadcasting system is connected to the analog demodulation processing circuit 33. After that, it is necessary to determine the broadcasting system of the signal in the color / sound discrimination processing circuit 41 in the subsequent stage.
　上述したように、各放送方式と上記フィルタが有する周波数帯域との対応関係は予め決められている。そのため、ある放送方式で規定されたテレビジョン信号に対して、当該放送方式と対応していない周波数帯域を有するフィルタを作用させた場合、すなわち不適切なフィルタ設定が行われた場合には、テレビジョン信号の受信状況によっては、その後の放送方式の判別結果として所望の判別結果が得られない（テレビジョン信号に規定された放送方式と一致しない）可能性がある。 As described above, the correspondence between each broadcasting system and the frequency band of the filter is determined in advance. Therefore, when a filter having a frequency band not corresponding to the broadcasting system is applied to a television signal defined by a certain broadcasting system, that is, when an inappropriate filter setting is performed, Depending on the reception status of the television signal, there is a possibility that a desired discrimination result cannot be obtained as a subsequent broadcast format discrimination result (does not match the broadcast format specified in the television signal).
　一方で、チャンネルサーチ時に、対象周波数帯域（その帯域に含まれる復調信号）に対して、各放送方式に対応したフィルタ（例えば、６ＭＨｚ、７ＭＨｚ、８ＭＨｚのフィルタの全て）を順次作用させた後に当該対象周波数帯域に対する放送方式の判別を行うとなると、正常な局登録が可能な判別結果を得るまでに時間を要する可能性がある。また、誤ったテレビシステムにて局登録がなされてしまう可能性もある。 On the other hand, after channel filters (for example, all filters of 6 MHz, 7 MHz, and 8 MHz) are sequentially applied to the target frequency band (the demodulated signal included in the band) during channel search, When determining the broadcasting system for the target frequency band, it may take time to obtain a determination result that allows normal station registration. There is also a possibility that the station registration is made by an incorrect television system.
　本実施形態においては、アナログ復調処理回路３３は、局を有する周波数帯域（チャンネル）の検出が全て行われた後に、（１）上記検出されたテレビジョン信号が有する周波数帯域のそれぞれの中心周波数を確認し、（２）チャンネルサーチの対象（放送方式の判別を行う対象）となる対象周波数帯域の中心周波数と、対象周波数帯域に隣接する周波数帯域の中心周波数との間隔を算出し、（３）当該間隔に応じて、上記復調信号に対して作用させるフィルタを選択および設定している。これにより、各チャンネルに対して、放送方式に対応したフィルタを適切に選択することができるので、テレビジョン信号が混線している状況化であっても、放送方式の正確な判別を行うことが可能となる。すなわち、アナログ放送における放送方式の検出精度を向上させることができる。これらの具体的な処理については〔放送受信装置１の詳細構成〕以降において説明する。 In the present embodiment, the analog demodulation processing circuit 33, after all the frequency bands (channels) having the stations are detected, (1) the center frequencies of the frequency bands of the detected television signal are determined. (2) calculating the interval between the center frequency of the target frequency band that is the target of channel search (target for determining the broadcasting system) and the center frequency of the frequency band adjacent to the target frequency band, and (3) A filter that acts on the demodulated signal is selected and set according to the interval. As a result, a filter corresponding to the broadcasting system can be appropriately selected for each channel, so that the broadcasting system can be accurately determined even in a situation where the television signal is mixed. It becomes possible. That is, it is possible to improve the detection accuracy of the broadcasting system in analog broadcasting. These specific processes will be described in the following [Detailed configuration of broadcast receiving apparatus 1].
　なお、本実施形態では、ＩＦ信号から変換された復調信号に対して、選択されたフィルタを作用させるものとして説明するが、ＩＦ信号に対して当該フィルタを作用させてもよい。 In the present embodiment, the selected filter is described as being applied to the demodulated signal converted from the IF signal, but the filter may be applied to the IF signal.
　また、上記放送方式と、フィルタが有する所定の周波数帯域との間には、現在以下のような対応関係が規定されている。すなわち、７ＭＨｚまたは８ＭＨｚのフィルタ設定が必要な放送方式（カラーシステム／サウンドシステム）としては、例えば、ＰＡＬ／ＢＧ、ＰＡＬ／ＤＫ、ＰＡＬ／Ｉ、ＳＥＣＡＭ／ＢＧ、ＳＥＣＡＬ／ＤＫ、ＳＥＣＡＭ／Ｉ、ＮＴＳＣ４．４３／ＢＧ、ＮＴＳＣ４．４３／ＤＫ、ＮＴＳＣ４．４３／Ｉ、ＳＥＣＡＭ／Ｌ、ＳＥＣＡＭ／Ｌ’が挙げられる。この例において、サウンドシステム「ＢＧ」のみが７ＭＨｚのフィルタ設定が必要であり、その他のカラーシステムおよびサウンドシステムは８ＭＨｚのフィルタ設定が必要となる。一方、６ＭＨｚのフィルタ設定が必要な放送方式（カラーシステム／サウンドシステム）としては、例えば、ＮＴＳＣ３．５８／ＭＮ、ＰＡＬ／ＭＮが挙げられる。 In addition, the following correspondence is currently defined between the broadcasting system and a predetermined frequency band of the filter. That is, as a broadcasting system (color system / sound system) that requires 7 MHz or 8 MHz filter setting, for example, PAL / BG, PAL / DK, PAL / I, SECAM / BG, SECAL / DK, SECAM / I, NTSC4 .43 / BG, NTSC 4.43 / DK, NTSC 4.43 / I, SECAM / L, SECAM / L ′. In this example, only the sound system “BG” requires a 7 MHz filter setting, and the other color and sound systems require an 8 MHz filter setting. On the other hand, examples of broadcast systems (color system / sound system) that require 6 MHz filter settings include NTSC 3.58 / MN and PAL / MN.
　なお、本実施形態では、チューナ３が上記のＩＦ変換処理回路３１、フィルタ設定回路３２およびアナログ復調処理回路３３をそれぞれ備えるものとして説明するが、これに限らず、上記３つの処理回路の機能を有していればよい。すなわち、チューナ３がこれらの処理回路を別々に備えた構成ではなく、例えば、これらの回路が有する機能を備えた１つのＩＣチップから構成されていてもよい。また、ＩＦ変換処理回路３１、フィルタ設定回路３２およびアナログ復調処理回路３３のうちの２つの回路が同一のＩＣチップから構成されていてもよい。この場合例えば、（１）ＩＦ変換処理回路３１およびフィルタ設定回路３２が１つの回路（チューナ部）からなり、チューナ３が当該チューナ部とアナログ復調処理回路３３とを備えた構成であってもよいし、（２）フィルタ設定回路３２およびアナログ復調処理回路３３が１つの回路（アナログ復調部）からなり、チューナ３が当該アナログ復調部とＩＦ変換処理回路３１とを備えた構成であってもよい。 In the present embodiment, the tuner 3 is described as including the IF conversion processing circuit 31, the filter setting circuit 32, and the analog demodulation processing circuit 33. However, the present invention is not limited to this, and the functions of the three processing circuits are described. It only has to have. In other words, the tuner 3 may not be configured to include these processing circuits separately, but may be configured from, for example, one IC chip having the functions of these circuits. Further, two of the IF conversion processing circuit 31, the filter setting circuit 32, and the analog demodulation processing circuit 33 may be composed of the same IC chip. In this case, for example, (1) the IF conversion processing circuit 31 and the filter setting circuit 32 may be configured by one circuit (tuner unit), and the tuner 3 may include the tuner unit and the analog demodulation processing circuit 33. (2) The filter setting circuit 32 and the analog demodulation processing circuit 33 may be configured by one circuit (analog demodulation unit), and the tuner 3 may include the analog demodulation unit and the IF conversion processing circuit 31. .
　次に、映像・音声処理回路４は、チューナ３のアナログ復調処理回路３３から送信された復調信号に対する各種処理を行うものである。映像・音声処理回路４は、当該処理を行うために、カラー・サウンド判別処理回路４１、ビデオエンコーダ４２、オーディオエンコーダ４３および信号出力回路４４を備えている。 Next, the video / audio processing circuit 4 performs various processes on the demodulated signal transmitted from the analog demodulation processing circuit 33 of the tuner 3. The video / audio processing circuit 4 includes a color / sound discrimination processing circuit 41, a video encoder 42, an audio encoder 43, and a signal output circuit 44 in order to perform the processing.
　カラー・サウンド判別処理回路４１は、復調信号の放送方式であるカラーシステムおよびサウンドシステムを判別し、局登録を行うものである。カラー・サウンド判別処理回路４１は、局登録後の映像信号をビデオエンコーダ４２に送信し、音声信号をオーディオエンコーダ４３に送信する。 The color / sound discrimination processing circuit 41 discriminates a color system and a sound system which are broadcast systems of demodulated signals, and performs station registration. The color / sound discrimination processing circuit 41 transmits the video signal after station registration to the video encoder 42 and transmits the audio signal to the audio encoder 43.
　ビデオエンコーダ４２は、映像信号に対して符号化処理を行うものであり、オーディオエンコーダ４３は、音声信号に対して符号化処理を行うものである。 The video encoder 42 performs encoding processing on the video signal, and the audio encoder 43 performs encoding processing on the audio signal.
　信号出力回路４４は、復号化された映像信号および音声信号をＡＶ信号として、例えば後段に接続されたＶＲＡＭ（Video Random Access Memory）（不図示）に送信する。これにより、表示装置（不図示）による映像表示、および、スピーカ（不図示）による音声出力が可能となる。 The signal output circuit 44 transmits the decoded video signal and audio signal as AV signals to, for example, a VRAM (Video Random Access Memory) (not shown) connected to the subsequent stage. Thereby, video display by a display device (not shown) and audio output by a speaker (not shown) are possible.
　制御部５は、記憶部６に格納されているプログラムを、例えばＲＡＭ等で構成される一時記録部（不図示）に読み出して実行することにより、上記各部材の処理等の各種処理を行う。 The control unit 5 performs various processing such as processing of each member by reading and executing the program stored in the storage unit 6 into a temporary recording unit (not shown) configured by, for example, a RAM or the like.
　記憶部６は、制御部５が実行する各部の制御プログラムおよびアプリケーションプログラム等を記録するものである。記憶部６は、例えばＲＯＭ（Read Only Memory）フラッシュメモリなどの不揮発性の記録装置によって構成されるものである。なお、上述した一時記憶部は、ＲＡＭなどの揮発性の記録装置によって構成されているが、記憶部６が一時記憶部の機能も備えていてもよい。 The storage unit 6 records a control program, an application program, and the like of each unit executed by the control unit 5. The storage unit 6 is configured by a non-volatile recording device such as a ROM (Read Only Memory) flash memory. The temporary storage unit described above is configured by a volatile recording device such as a RAM, but the storage unit 6 may also have a function of a temporary storage unit.
　〔放送受信装置１の詳細構成〕
　次に、図１に基づいて、放送受信装置１の詳細構成、特に制御部５の詳細構成について説明する。図１は、本実施形態に係る放送受信装置１の一例を示す機能ブロック図である。以降では、特に断りがない限り、チャンネルサーチ処理（テレビジョン信号をスキャンするときの局発周波数判別処理および放送方式の判別処理）に特化して、その説明を行う。 [Detailed Configuration of Broadcast Receiver 1]
Next, based on FIG. 1, the detailed structure of the broadcast receiver 1, especially the detailed structure of the control part 5 is demonstrated. FIG. 1 is a functional block diagram showing an example of a broadcast receiving apparatus 1 according to the present embodiment. Hereinafter, unless otherwise specified, the channel search process (local frequency determination process when scanning a television signal and broadcast system determination process) will be described specifically.
　制御部５は、主として、チューナ制御部５０および映像・音声処理回路制御部６０を備えている。 The control unit 5 mainly includes a tuner control unit 50 and a video / audio processing circuit control unit 60.
　チューナ制御部５０は、チューナ３が備える各回路に指令を与えて、各回路の処理を制御するものである。本実施形態では特に、チューナ３が備えるフィルタ設定回路３２およびアナログ復調処理回路３３に対する制御について具体的に説明する。チューナ制御部５０は、主として、局部発振周波数検出部（局部発振周波数検出手段）５１、局設定部５２、周波数間隔算出部５３、フィルタ選択部（フィルタ選択手段）５４およびフィルタ設定部５５を備えている。 The tuner control unit 50 gives a command to each circuit included in the tuner 3 to control processing of each circuit. In the present embodiment, the control for the filter setting circuit 32 and the analog demodulation processing circuit 33 provided in the tuner 3 will be specifically described. The tuner control unit 50 mainly includes a local oscillation frequency detection unit (local oscillation frequency detection unit) 51, a station setting unit 52, a frequency interval calculation unit 53, a filter selection unit (filter selection unit) 54, and a filter setting unit 55. Yes.
　局部発振周波数検出部５１は、複数の局のそれぞれが有する周波数を検出する。具体的には、局部発振周波数検出部５１は、ＡＦＣまたはＡＦＴを用いて、テレビジョン信号が存在する可能性がある全周波数範囲において、チューナ３に設定する可能性がある周波数帯域を検出する。そして、局部発振周波数検出部５１は、チューナ３に設定した周波数の前後一定周波数範囲内に局が存在しているかを確認する。この局の存在の確認は、チューナ３に設定した周波数の前後一定周波数範囲内のテレビジョン信号が、所定の放送方式で規定されたＡＴＶ（Analog Television）信号を有しているか否かについて確認し、ＡＴＶ信号が存在する場合にはチューナ３に設定した周波数と局部発振周波数（局発周波数）とがどの程度離れているかを検出することにより行われる。そして、ＡＴＶ信号を有している場合には、局部発振周波数との周波数差を補正し、本来の局部発振周波数にチューナ３を再設定し、再度ＡＴＶ信号の有無を判別することにより、検出した周波数帯域が局を有すると判定し、当該周波数帯域を局と対応づけて記憶部６に記憶する。 The local oscillation frequency detector 51 detects the frequency of each of the plurality of stations. Specifically, the local oscillation frequency detector 51 uses AFC or AFT to detect a frequency band that may be set in the tuner 3 in the entire frequency range in which a television signal may exist. Then, the local oscillation frequency detection unit 51 confirms whether the station exists within a certain frequency range before and after the frequency set in the tuner 3. The existence of this station is confirmed by checking whether or not the television signal within a certain frequency range before and after the frequency set in the tuner 3 has an ATV (Analog Television) signal defined by a predetermined broadcasting system. When the ATV signal is present, this is performed by detecting how far the frequency set in the tuner 3 and the local oscillation frequency (local oscillation frequency) are separated. If the ATV signal is present, the frequency difference from the local oscillation frequency is corrected, the tuner 3 is reset to the original local oscillation frequency, and the presence or absence of the ATV signal is determined again. It is determined that the frequency band has a station, and the frequency band is associated with the station and stored in the storage unit 6.
　局設定部５２は、チューナ３に対して、局を有する周波数帯域を対象周波数帯域として設定するものである。具体的には、局設定部５２は、記憶部６に記憶されている各周波数帯域を順に読み出して、対象周波数帯域として設定する。 The station setting unit 52 sets a frequency band having a station as a target frequency band for the tuner 3. Specifically, the station setting unit 52 sequentially reads out each frequency band stored in the storage unit 6 and sets it as a target frequency band.
　周波数間隔算出部５３は、記憶部６に記憶された、局を有する周波数帯域の中心周波数を全て検出し、（１）隣接する中心周波数どうしの間隔、（２）上記全周波数範囲の最低周波数と、当該最低周波数（例えば４５ＭＨｚ）と隣接する中心周波数との間隔、（３）上記全周波数範囲の最高周波数（例えば８６０ＭＨｚ）と、当該最高周波数と隣接する中心周波数との間隔、を算出する。そして、この算出結果を記憶部６に記憶する。 The frequency interval calculation unit 53 detects all the center frequencies of the frequency band having the stations stored in the storage unit 6, and (1) the interval between adjacent center frequencies, and (2) the lowest frequency in the entire frequency range. , The interval between the lowest frequency (for example, 45 MHz) and the adjacent center frequency, and (3) the highest frequency (for example, 860 MHz) in the entire frequency range and the interval between the highest frequency and the adjacent center frequency. Then, the calculation result is stored in the storage unit 6.
　なお、上記では、各周波数帯域の中心周波数を用いて上記間隔を算出しているが、これに限らず、各周波数帯域において同じ位置に存在する周波数を用いて上記間隔の算出を行ってもよい。ただし、中心周波数の検出は、１０～２５ｋＨｚ程度の精度で容易に検出可能であるため、中心周波数を用いて上記算出を行った方が処理効率がよい。 In the above description, the interval is calculated using the center frequency of each frequency band. However, the present invention is not limited to this, and the interval may be calculated using frequencies that exist at the same position in each frequency band. . However, since the center frequency can be easily detected with an accuracy of about 10 to 25 kHz, it is more efficient to perform the above calculation using the center frequency.
　フィルタ選択部５４は、局部発振周波数検出部５１が検出した周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、周波数間隔算出部５３が算出した対象周波数帯域に隣接する周波数帯域との間隔に応じて、対象周波数帯域に作用させる所定の周波数帯域を有するフィルタ（フィルタ帯域幅）を選択するものである。 The filter selection unit 54 includes a target frequency band that is a frequency band having the detected station among the frequencies detected by the local oscillation frequency detection unit 51, and a frequency band adjacent to the target frequency band calculated by the frequency interval calculation unit 53. In accordance with the interval, a filter (filter bandwidth) having a predetermined frequency band to be applied to the target frequency band is selected.
　具体的には、アナログ復調処理回路３３に設定される可能性がある複数のフィルタが有する所定の周波数帯域は、（１）対象周波数帯域の中心周波数と、対象周波数帯域に隣接する、対象周波数帯域よりも低い周波数帯域である低隣接周波数帯域の中心周波数（または最低周波数）との第１間隔と、（２）対象周波数帯域の中心周波数と、対象周波数帯域に隣接する、対象周波数帯域よりも高い周波数帯域である高隣接周波数帯域の中心周波数（または最高周波数）との第２間隔と、に対応付けて記憶部６に記憶されている。そのため、フィルタ選択部５４は、周波数間隔算出部５３が算出した各周波数の間隔のうち、上記第１間隔および第２間隔となる間隔を示すデータを読み出した後、当該第１間隔および第２間隔に対応する周波数帯域を有するフィルタを、アナログ復調処理回路３３に設定するフィルタとして決定する。 Specifically, the predetermined frequency band included in the plurality of filters that may be set in the analog demodulation processing circuit 33 is (1) the center frequency of the target frequency band and the target frequency band adjacent to the target frequency band. A first interval with a center frequency (or lowest frequency) of a low adjacent frequency band, which is a lower frequency band, and (2) a center frequency of the target frequency band and higher than the target frequency band adjacent to the target frequency band It is stored in the storage unit 6 in association with the second interval from the center frequency (or highest frequency) of the high adjacent frequency band that is the frequency band. Therefore, the filter selection unit 54 reads the data indicating the first interval and the second interval among the intervals of the frequencies calculated by the frequency interval calculation unit 53, and then reads the first interval and the second interval. Is determined as a filter to be set in the analog demodulation processing circuit 33.
　また、フィルタ選択部５４は、選択したフィルタが複数存在する場合には、予め地域別に設定されている周波数帯域と一致する周波数帯域を有するフィルタを、対象周波数帯域に作用させるフィルタとして選択してもよい。 In addition, when there are a plurality of selected filters, the filter selection unit 54 may select a filter having a frequency band that matches a frequency band set in advance for each region as a filter that acts on the target frequency band. Good.
　上述したように、放送方式は地域別に予め設定されている。放送受信装置１の設置位置において、ユーザがその地域別の放送方式（標準放送方式）を予め設定しておくことで、フィルタ選択部５４は、選択したフィルタの中に、標準放送方式に対応づけられたフィルタの周波数帯域と一致するものがあるか否かを判定することができる。そのため、複数のフィルタを選択した場合であっても、その後一意的にフィルタを選択することができる。 As described above, the broadcasting system is preset for each region. The filter selection unit 54 associates the selected filter with the standard broadcast method by setting the broadcast method (standard broadcast method) for each region in advance at the installation position of the broadcast receiving device 1. It is possible to determine whether there is a match with the frequency band of the selected filter. Therefore, even when a plurality of filters are selected, the filters can be uniquely selected thereafter.
　なお、フィルタが有する所定の周波数帯域と、各地域（国）の標準放送方式との間には、現在以下のような対応関係が規定されている。
・中国：８ＭＨｚ（標準ＰＡＬ／ＤＫ）
・英国：８ＭＨｚ（標準ＰＡＬ／Ｉ）
・台湾：６ＭＨｚ（標準ＮＴＳＣ／Ｍ）
・フランス：８ＭＨｚ（標準ＳＥＣＡＭ／Ｌ）
・ドイツ（ＶＨＦ）：７ＭＨｚ（標準ＰＡＬ／Ｂ）
・ドイツ（ＵＨＦ）：８ＭＨｚ（標準ＰＡＬ／Ｇ）
・アメリカ：６ＭＨｚ（標準ＮＴＳＣ／Ｍ）
・ロシア：８ＭＨｚ（標準ＳＥＣＡＭ／ＤＫ）
　フィルタ設定部５５は、フィルタ選択部５４が選択したフィルタを、アナログ復調処理回路３３に設定するものである。フィルタ設定部５５は、アナログ復調処理回路３３へのフィルタ設定が完了すると、その旨システム判別部（放送方式判別手段）６１に通知する。 The following correspondence is currently defined between the predetermined frequency band of the filter and the standard broadcasting system of each region (country).
-China: 8 MHz (standard PAL / DK)
・ UK: 8 MHz (standard PAL / I)
・ Taiwan: 6 MHz (standard NTSC / M)
・ France: 8 MHz (standard SECAM / L)
・ Germany (VHF): 7 MHz (standard PAL / B)
・ Germany (UHF): 8 MHz (standard PAL / G)
・ US: 6 MHz (standard NTSC / M)
・ Russia: 8 MHz (standard SECAM / DK)
The filter setting unit 55 sets the filter selected by the filter selection unit 54 in the analog demodulation processing circuit 33. When the filter setting for the analog demodulation processing circuit 33 is completed, the filter setting unit 55 notifies the system determination unit (broadcast method determination means) 61 to that effect.
　映像・音声処理回路制御部６０は、映像・音声処理回路４が備える各回路に指令を与えて、各回路の処理を制御するものである。本実施形態では特に、映像・音声処理回路４が備えるカラー・サウンド判別処理回路４１に対する制御について具体的に説明する。映像・音声処理回路制御部６０は、主として、システム判別部６１および局登録処理部６２を備えている。 The video / audio processing circuit control unit 60 gives a command to each circuit included in the video / audio processing circuit 4 and controls processing of each circuit. In the present embodiment, the control of the color / sound discrimination processing circuit 41 included in the video / audio processing circuit 4 will be specifically described. The video / audio processing circuit control unit 60 mainly includes a system discrimination unit 61 and a station registration processing unit 62.
　システム判別部６１は、アナログ復調処理回路３３へのフィルタ設定完了の通知を受けると、カラー・サウンド判別処理回路４１が、アナログ復調処理回路３３から復調信号を受信していることを確認する。システム判別部６１は、その確認ができた場合に、カラー・サウンド判別処理回路４１が受信した復調信号の放送方式を判別し、その判別結果を局登録処理部６２に送信する。 When the system discriminating unit 61 receives the notification of the completion of the filter setting to the analog demodulation processing circuit 33, it confirms that the color / sound discrimination processing circuit 41 has received the demodulated signal from the analog demodulation processing circuit 33. When the confirmation is made, the system discriminating unit 61 discriminates the broadcast system of the demodulated signal received by the color / sound discrimination processing circuit 41 and transmits the discrimination result to the station registration processing unit 62.
　具体的には、システム判別部６１は、アナログ復調処理回路３３から受信したテレビジョン信号（アナログ信号）が有効なカラーシステム（ＰＡＬ／ＳＥＣＡＭ／ＮＴＳＣ）であるか、有効なサウンドシステム（ＢＧ／ＤＫ／Ｉ／ＭＮ／Ｌ／Ｌ’）であるか、を判別し、カラーシステム・サウンドシステム共に有効なシステムが取得できた場合、その判別結果を局登録処理部６２に送信する。 Specifically, the system determination unit 61 determines whether the television signal (analog signal) received from the analog demodulation processing circuit 33 is an effective color system (PAL / SECAM / NTSC) or an effective sound system (BG / DK). / I / MN / L / L ′), and if a valid system can be obtained for both the color system and the sound system, the determination result is transmitted to the station registration processing unit 62.
　局登録処理部６２は、上記判別結果が有効な放送方式が取得できたことを示す場合には、放送方式の判別が行われた周波数帯域（対象周波数帯域）の局登録を行う。一方、局登録処理部６２は、上記判別結果が有効な放送方式が取得できなかったことを示す場合には、放送方式の判別が行われた周波数帯域の局登録を行わない。 If the determination result indicates that an effective broadcasting system has been acquired, the station registration processing unit 62 performs station registration of the frequency band (target frequency band) where the broadcasting system is determined. On the other hand, the station registration processing unit 62 does not perform station registration of the frequency band for which the broadcasting method is determined when the determination result indicates that an effective broadcasting method has not been acquired.
　〔フィルタテーブル〕
　上述のように、フィルタ選択部５４は、対象周波数帯域に作用させるフィルタは、上記第１間隔および第２間隔に基づいて選択される。そのフィルタが有する周波数帯域と、第１間隔および第２間隔との対応関係の一例を、図３を用いて説明する。図３は、この対応関係の一例を示す図であり、（ａ）がフィルタテーブルＴ１の一例を示し、（ｂ）がフィルタテーブルＴ２の一例を示すものである。なお、フィルタテーブルＴ１およびＴ２の「６Ｍ」、「７Ｍ」および「８Ｍ」は、「６ＭＨｚのフィルタ」、「７ＭＨｚのフィルタ」および「８ＭＨｚのフィルタ」を指す。 [Filter table]
As described above, the filter selection unit 54 selects a filter to be applied to the target frequency band based on the first interval and the second interval. An example of the correspondence between the frequency band of the filter and the first and second intervals will be described with reference to FIG. FIG. 3 is a diagram showing an example of this correspondence relationship, where (a) shows an example of the filter table T1, and (b) shows an example of the filter table T2. Note that “6M”, “7M”, and “8M” in the filter tables T1 and T2 indicate “6 MHz filter”, “7 MHz filter”, and “8 MHz filter”.
　図３の（ａ）に示すフィルタテーブルＴ１は、現在のＶＨＦ（Very High Frequency）方式における上記の対応関係を示すテーブルである。図３の（ｂ）に示すフィルタテーブルＴ２は、現在のＵＨＦ（Ultra High Frequency）方式における上記の対応関係を示すテーブルである。また、図３の（ａ）および（ｂ）において、縦軸を第１間隔（Lower-Target）、横軸を第２間隔（Target-Upper）としている。 The filter table T1 shown in FIG. 3A is a table showing the above-described correspondence in the current VHF (Very High Frequency) method. A filter table T2 shown in (b) of FIG. 3 is a table showing the correspondence relationship in the current UHF (Ultra High Frequency) system. In FIGS. 3A and 3B, the vertical axis is the first interval (Lower-Target), and the horizontal axis is the second interval (Target-Upper).
　フィルタテーブルＴ１およびＴ２では、選択されたフィルタが、隣接する周波数帯域に含まれるテレビジョン信号の一部をフィルタリングしないように、フィルタの周波数帯域が設定されている。 In the filter tables T1 and T2, the frequency band of the filter is set so that the selected filter does not filter a part of the television signal included in the adjacent frequency band.
　また、フィルタテーブルＴ１およびＴ２は記憶部６に記憶されている。そのため、フィルタ選択部５４は、上記第１間隔および第２間隔となる２つの間隔を示すデータを読み出すと、アンテナ２が受信したテレビジョン信号の周波数に応じてＶＨＦ方式かＵＨＦ方式かを判断し、フィルタテーブルＴ１またはＴ２を参照することにより、当該第１間隔および第２間隔に対応する６ＭＨｚ、７ＭＨｚおよび８ＭＨｚのフィルタのいずれかを選択することができる。 The filter tables T1 and T2 are stored in the storage unit 6. Therefore, when the filter selection unit 54 reads the data indicating the two intervals that are the first interval and the second interval, the filter selection unit 54 determines whether the antenna 2 is the VHF method or the UHF method according to the frequency of the television signal received. By referring to the filter table T1 or T2, it is possible to select any of 6 MHz, 7 MHz, and 8 MHz filters corresponding to the first interval and the second interval.
　また、例えばフィルタテーブルＴ１において、第１間隔が「６．５以上７未満」、第２間隔が「７以上７．５未満」に対応するフィルタとして、「６ＭＨｚのフィルタまたは７ＭＨｚのフィルタ（６Ｍ／７Ｍ）」と設定されている。すなわち、フィルタテーブルＴ１およびＴ２では、選択可能なフィルタとして、複数のフィルタ（「６ＭＨｚのフィルタまたは７ＭＨｚのフィルタ（６Ｍ／７Ｍ）」、「６ＭＨｚのフィルタ、７ＭＨｚのフィルタまたは８ＭＨｚのフィルタ（６Ｍ／７Ｍ／８Ｍ）」、「６ＭＨｚのフィルタまたは８ＭＨｚのフィルタ（６Ｍ／８Ｍ）」）が設定されている箇所がある（図３の（ａ）および（ｂ）の網掛け部分）。すなわち、第１間隔および第２間隔の当該網掛け部分に対応する値となった場合には、対象周波数帯域に作用させることが可能なフィルタが複数存在することになる。 Further, for example, in the filter table T1, as a filter corresponding to the first interval of “6.5 or more and less than 7” and the second interval of “7 or more and less than 7.5”, “6 MHz filter or 7 MHz filter (6M / 7M) ”. That is, in the filter tables T1 and T2, a plurality of filters (“6 MHz filter or 7 MHz filter (6M / 7M)”, “6 MHz filter, 7 MHz filter, or 8 MHz filter (6M / 7M) are selectable filters. / 8M) ”and“ 6 MHz filter or 8 MHz filter (6M / 8M) ”) are set (shaded portions in FIGS. 3A and 3B). That is, when a value corresponding to the shaded portion of the first interval and the second interval is reached, there are a plurality of filters that can be applied to the target frequency band.
　この場合には、上述のように、フィルタ選択部５４が地域別に設定されている周波数帯域と一致する周波数帯域を有するフィルタを、対象周波数帯域に作用させるフィルタとして選択する。これにより、適切である可能性の高いフィルタを選択することができる。なお、各フィルタをそれぞれ対象周波数帯域に作用させて放送方式の判別を行ってもよいが、上記のように地域別の周波数帯域を用いたフィルタ選択を行うことで、チャンネルサーチ処理時間の短縮を図ることが可能となる。 In this case, as described above, the filter selection unit 54 selects a filter having a frequency band that matches the frequency band set for each region as a filter that acts on the target frequency band. Thereby, a filter with high possibility of being appropriate can be selected. Note that the broadcasting method may be determined by applying each filter to the target frequency band, but the channel search processing time can be shortened by selecting the filter using the frequency band for each region as described above. It becomes possible to plan.
　〔フィルタ適用例〕
　次に、図４に基づいて、フィルタの具体的な適用例について説明する。図４は、チャンネル毎の周波数帯域の一例を示す図である。 [Filter application example]
Next, a specific application example of the filter will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of a frequency band for each channel.
　図４に示す例では、局部発振周波数検出部５１によって記憶部６に記憶された、局を有する周波数帯域が３つである場合を示している。また、同図では、対象周波数帯域（Target Channel）をチャンネルＢ１とし、その両隣りに存在する周波数帯域のうち、低い方の周波数帯域（低隣接周波数帯域、Lower Channel）をチャンネルＡ１、高い方の周波数帯域（高隣接周波数帯域、Upper Channel）をチャンネルＣ１とする。さらに、受信するテレビジョン信号Ａ１１、Ｂ１１、Ｃ１１がＵＨＦ方式であるとして説明する。 The example shown in FIG. 4 shows a case where there are three frequency bands having a station, which are stored in the storage unit 6 by the local oscillation frequency detection unit 51. Further, in the figure, the target frequency band (Target Channel) is channel B1, and of the frequency bands existing on both sides thereof, the lower frequency band (low adjacent frequency band, Lower Channel) is channel A1, and the higher frequency band. The frequency band (high adjacent frequency band, UpperUpChannel) is defined as channel C1. Further, description will be made assuming that the received television signals A11, B11, and C11 are UHF.
　すなわち、複数の局を有する周波数帯域のうち、放送方式の判別を行う対象となる周波数帯域を対象周波数帯域とした場合、その対象周波数帯域に隣接する低い側の周波数帯域が低隣接周波数帯域となり、その対象周波数帯域に隣接する高い側の周波数帯域が高隣接周波数帯域となる。また、上記対象周波数帯域としては、上記複数の局を有する周波数帯域の全てが順次選択される。 That is, out of the frequency bands having a plurality of stations, when the frequency band that is a target for determining the broadcasting method is the target frequency band, the lower frequency band adjacent to the target frequency band becomes the low adjacent frequency band, The higher frequency band adjacent to the target frequency band is the high adjacent frequency band. Further, all the frequency bands having the plurality of stations are sequentially selected as the target frequency band.
　図４に示す例の場合、周波数間隔算出部５３は、チャンネルＡ１、チャンネルＢ１、チャンネルＣ１のそれぞれの中心周波数Ａｃ、Ｂｃ、Ｃｃを検出する。そして、最低周波数と中心周波数Ａｃとの間隔α０、中心周波数ＡｃとＢｃとの間隔α１、中心周波数ＢｃとＣｃとの間隔α２、中心周波数Ｃｃと最高周波数との間隔α３、をそれぞれ算出する。 In the example shown in FIG. 4, the frequency interval calculation unit 53 detects the center frequencies Ac, Bc, and Cc of the channels A1, B1, and C1, respectively. Then, an interval α0 between the lowest frequency and the center frequency Ac, an interval α1 between the center frequencies Ac and Bc, an interval α2 between the center frequencies Bc and Cc, and an interval α3 between the center frequency Cc and the highest frequency are calculated.
　また、この例では、チャンネルＢ１を対象周波数帯域としているので、フィルタ選択部５４は、上記第１間隔として間隔α１（＝６．５ＭＨｚ）、上記第２間隔として間隔α２（＝７ＭＨｚ）を示す２つのデータを読み出すとともに、図３の（ｂ）に示すフィルタテーブルＴ２を読み出す。そのため、フィルタ選択部５４は、フィルタテーブルＴ２を参照して、第１間隔（縦軸）が「６．５以上７未満」、第２間隔（横軸）が「７以上７．５未満」に対応する部分（図３の（ｂ）に示す太枠部分）の「６ＭＨｚのフィルタ」を、選択するフィルタとして決定する。 In this example, since the channel B1 is the target frequency band, the filter selection unit 54 indicates the interval α1 (= 6.5 MHz) as the first interval and 2 indicating the interval α2 (= 7 MHz) as the second interval. While reading out two pieces of data, the filter table T2 shown in FIG. 3B is read out. Therefore, the filter selection unit 54 refers to the filter table T2 so that the first interval (vertical axis) is “6.5 or more and less than 7” and the second interval (horizontal axis) is “7 or more and less than 7.5”. The “6 MHz filter” of the corresponding part (the thick frame part shown in FIG. 3B) is determined as the filter to be selected.
　〔放送受信装置１におけるチャンネルサーチ処理〕
　次に、図５および図６に基づいて、放送受信装置１におけるチャンネルサーチ処理の一例について説明する。図５は、放送受信装置１におけるチャンネルサーチ処理の一例を示す図である。 [Channel Search Processing in Broadcast Receiver 1]
Next, an example of channel search processing in the broadcast receiving apparatus 1 will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram illustrating an example of channel search processing in the broadcast receiving apparatus 1.
　図５に示すように、局部発振周波数検出部５１は、ＡＦＣまたはＡＦＴを用いて、テレビジョン信号が存在する可能性がある全周波数範囲において、チューナ３に設定した周波数と局部発振周波数との差を検出し、検出した局部発振周波数をチューナ３に再設定する、という制御を繰り返すことで、正確な局部発振周波数を取得し、局を有する周波数帯域が存在しているか否かを判別する（Ｓ１～Ｓ５：局部発振周波数検出ステップ）。 As shown in FIG. 5, the local oscillation frequency detection unit 51 uses the AFC or AFT, and the difference between the frequency set in the tuner 3 and the local oscillation frequency in the entire frequency range where the television signal may exist. Is repeated, and the control to reset the detected local oscillation frequency to the tuner 3 is repeated, so that an accurate local oscillation frequency is obtained and it is determined whether or not a frequency band having a station exists (S1). ~ S5: Local oscillation frequency detection step).
　具体的には、局部発振周波数検出部５１は、チューナ３に周波数を設定し（Ｓ１）、当該設定した周波数（チューナ設定周波数）から一定範囲内に局が存在しているかを確認する（Ｓ２）。そして、一定範囲内に局が存在すると判断した場合には（Ｓ２でＹＥＳ）、局部発振周波数（局発周波数）を取得し（Ｓ３）、チューナ３を当該局部発振周波数に設定する（Ｓ４）。そして、再度ＡＴＶ信号の有無を判別することにより、局を有する周波数帯域（局有り周波数）が存在しているか否かを判別する（Ｓ５）。 Specifically, the local oscillation frequency detector 51 sets a frequency in the tuner 3 (S1), and confirms whether a station exists within a certain range from the set frequency (tuner set frequency) (S2). . If it is determined that a station exists within a certain range (YES in S2), a local oscillation frequency (local oscillation frequency) is acquired (S3), and the tuner 3 is set to the local oscillation frequency (S4). Then, the presence / absence of the ATV signal is determined again to determine whether or not a frequency band (station frequency) having a station exists (S5).
　局部発振周波数検出部５１は、局を有する周波数帯域が存在していると判別した場合には、その周波数帯域（局有り周波数）を記憶部６に保存する（Ｓ６）。その後、上記全周波数範囲の最高周波数まで（すなわち全周波数範囲において）、当該周波数帯域の検出を行ったか否かを判定し（Ｓ７）、当該検出が完了していれば、局部発振周波数検出部５１による処理を終了する。このとき、局部発振周波数検出部５１は、自身の処理が完了した旨を局設定部５２に通知する。 If the local oscillation frequency detection unit 51 determines that there is a frequency band having a station, the local oscillation frequency detection unit 51 stores the frequency band (local frequency) in the storage unit 6 (S6). Thereafter, it is determined whether or not the frequency band has been detected up to the highest frequency in the entire frequency range (that is, in the entire frequency range) (S7). If the detection is completed, the local oscillation frequency detection unit 51 is detected. The process by is terminated. At this time, the local oscillation frequency detection unit 51 notifies the station setting unit 52 that its own processing has been completed.
　一方、Ｓ２でＮＯの場合（Ｓ１でチューナ３に設定した周波数の一定範囲内に局が存在しない場合）、Ｓ５でＮＯの場合（局を有する周波数帯域が存在しない場合）、および、Ｓ７でＮＯの場合（最高周波数まで周波数帯域の検出が完了していない場合）には、Ｓ１に戻り局を有する周波数帯域の検出処理を開始する。 On the other hand, if NO in S2 (when there is no station within a certain range of the frequency set in tuner 3 in S1), if NO in S5 (when there is no frequency band having stations), and NO in S7 In the case of (when the detection of the frequency band up to the maximum frequency is not completed), the process returns to S1 and the detection process of the frequency band having the station is started.
　このように、放送受信装置１においては、フィルタ設定および放送方式の判別を行う前に、局を有する周波数帯域の全ての検出を完了している。 As described above, in the broadcast receiving apparatus 1, the detection of all the frequency bands having the station is completed before the filter setting and the broadcasting method are determined.
　局設定部５２は、局部発振周波数検出部５１から上記完了通知を受けると、図６に示すように、検出された局を有する周波数帯域のうちの１つを対象周波数帯域としてチューナ３に設定し（Ｓ１１）、その旨を周波数間隔算出部５３に通知する。 Upon receiving the completion notification from the local oscillation frequency detection unit 51, the station setting unit 52 sets one of the detected frequency bands having the station as a target frequency band in the tuner 3 as shown in FIG. (S11), to that effect is notified to the frequency interval calculation unit 53.
　周波数間隔算出部５３は、局設定部５２から上記通知を受けると、上述した各中心周波数の間隔等を算出する（Ｓ１２）。そして、その算出結果を記憶部６に記憶するとともに、上記間隔の算出が完了した旨を、フィルタ選択部５４に通知する。なお、Ｓ１１の処理とＳ１２の処理との順序は問わない。 When the frequency interval calculation unit 53 receives the notification from the station setting unit 52, the frequency interval calculation unit 53 calculates the interval between the center frequencies described above (S12). Then, the calculation result is stored in the storage unit 6 and the filter selection unit 54 is notified that the calculation of the interval is completed. In addition, the order of the process of S11 and the process of S12 is not ask | required.
　フィルタ選択部５４は、周波数間隔算出部５３から上記通知を受けると、記憶部６から、第１間隔および第２間隔となる間隔を示すデータを読み出し、フィルタテーブルＴ１またはＴ２を参照することにより、当該第１間隔および第２間隔に対応する周波数帯域を有するフィルタ（適用するフィルタ）を選択する（Ｓ１３：フィルタ選択ステップ）。 When the filter selection unit 54 receives the above notification from the frequency interval calculation unit 53, the filter selection unit 54 reads data indicating the first interval and the second interval from the storage unit 6, and refers to the filter table T1 or T2. A filter (filter to be applied) having a frequency band corresponding to the first interval and the second interval is selected (S13: filter selection step).
　その後、フィルタ選択部５４は、選択されたフィルタが１種類であるか否かを判定し（Ｓ１４）、１種類であった場合には（Ｓ１４でＹＥＳ）、その旨をフィルタ設定部５５に通知する。フィルタ設定部５５は、この通知を受けると、フィルタ選択部５４によって選択されたフィルタを、アナログ復調処理回路３３にて用いられるフィルタとして設定する（Ｓ１６）。 Thereafter, the filter selection unit 54 determines whether or not there is one type of selected filter (S14), and if it is one type (YES in S14), notifies the filter setting unit 55 to that effect. To do. Upon receiving this notification, the filter setting unit 55 sets the filter selected by the filter selection unit 54 as a filter used in the analog demodulation processing circuit 33 (S16).
　一方、複数種類であった場合には（Ｓ１４でＮＯ）、Ｓ１４において選択されたフィルタの中から、例えば地域（国）ごとに予め設定されている標準放送方式に対する周波数帯域と一致する周波数帯域を有するフィルタを選択し（Ｓ１５）、その旨をフィルタ設定部５５に通知する。フィルタ設定部５５は、この通知を受けると、フィルタ選択部５４によって選択されたフィルタをアナログ復調処理回路３３に設定する（Ｓ１６）。 On the other hand, if there are a plurality of types (NO in S14), a frequency band that matches the frequency band for the standard broadcasting system set in advance for each region (country) is selected from the filters selected in S14. The filter is selected (S15), and a notification to that effect is sent to the filter setting unit 55. Upon receiving this notification, the filter setting unit 55 sets the filter selected by the filter selection unit 54 in the analog demodulation processing circuit 33 (S16).
　その後、システム判別部６１は、フィルタ設定部５５から設定完了の通知を受けると、アナログ復調処理回路３３からカラー・サウンド判別処理回路４１が受信した復調信号の放送方式を判別する（Ｓ１７）。そして、その判別結果と、選択されたフィルタが有する周波数帯域との対応関係が、規定された対応関係と一致すると判別された場合、すなわち放送方式（カラーシステムおよびサウンドシステム）が有効であると判定された場合には（Ｓ１７でＹＥＳ）、その旨を局登録処理部６２に通知する。局登録処理部６２は、この通知を受けると、対象周波数帯域の局登録を行う（Ｓ１８）。 After that, upon receiving notification of setting completion from the filter setting unit 55, the system discrimination unit 61 discriminates the broadcast system of the demodulated signal received by the color / sound discrimination processing circuit 41 from the analog demodulation processing circuit 33 (S17). If it is determined that the correspondence between the determination result and the frequency band of the selected filter matches the specified correspondence, that is, it is determined that the broadcasting system (color system and sound system) is effective. If so (YES in S17), the station registration processing unit 62 is notified of this. Upon receiving this notification, the station registration processing unit 62 performs station registration in the target frequency band (S18).
　一方、システム判別部６１は、放送方式が有効ではないと判定された場合（Ｓ１７でＮＯ）、その旨を局登録処理部６２に通知する。局登録処理部６２は、この通知を受けた場合には、対象周波数帯域の局登録を行わない（Ｓ１９）。 On the other hand, when it is determined that the broadcasting system is not valid (NO in S17), the system determination unit 61 notifies the station registration processing unit 62 to that effect. When receiving this notification, the station registration processing unit 62 does not register the target frequency band (S19).
　局登録処理部６２は、対象周波数帯域に対する局登録処理（Ｓ１８またはＳ１９の処理）を完了すると、全ての局登録処理が完了したか否かを確認する（Ｓ２０）。例えば、局登録処理部６２は、記憶部６に記憶された、局を有する周波数帯域のうち、上記全周波数範囲の最高周波数に最も近い周波数帯域が対象周波数帯域であったか否かを判定することにより、全ての局登録処理が完了したか否かを確認する。 When the station registration processing unit 62 completes the station registration processing (S18 or S19) for the target frequency band, the station registration processing unit 62 checks whether all the station registration processing is completed (S20). For example, the station registration processing unit 62 determines whether or not the frequency band stored in the storage unit 6 and having the station closest to the highest frequency in the entire frequency range is the target frequency band. Confirm whether all the station registration processes are completed.
　全ての局登録処理が完了している場合には（Ｓ２０でＹＥＳ）、チャンネルサーチ処理を終了する。一方、まだ対象周波数帯域として設定されていない周波数帯域が存在する場合には（Ｓ２０でＮＯ）、Ｓ１１の処理に戻り、その周波数帯域の１つを対象周波数帯域としてチューナ３に設定する。 If all the station registration processes have been completed (YES in S20), the channel search process is terminated. On the other hand, if there is a frequency band that has not yet been set as the target frequency band (NO in S20), the process returns to S11, and one of the frequency bands is set in the tuner 3 as the target frequency band.
　〔比較例との差異〕
　次に、図７および図８に基づいて、本実施形態に係る放送受信装置１の比較例としての放送受信装置におけるチャンネルサーチ処理の説明、および、放送受信装置１と比較例としての放送受信装置とにおけるチャンネルサーチ処理の違いについて説明する。図７は、比較例としての放送受信装置におけるチャンネルサーチ処理の一例を示す図である。図８は処理シーケンスの一例を示す図であり、（ａ）は比較例としての放送受信装置の処理シーケンス１１０を示す図であり、（ｂ）は放送受信装置１の処理シーケンス１１を示す図である。この比較例としての放送受信装置は、アナログ復調処理回路に対して６ＭＨｚのフィルタと８ＭＨｚのフィルタとを設定することが可能となっているものとする。 [Difference from the comparative example]
Next, based on FIG. 7 and FIG. 8, description of channel search processing in the broadcast receiving apparatus as a comparative example of the broadcast receiving apparatus 1 according to the present embodiment, and the broadcast receiving apparatus as a comparative example with the broadcast receiving apparatus 1 Differences in channel search processing between and will be described. FIG. 7 is a diagram illustrating an example of channel search processing in a broadcast receiving apparatus as a comparative example. FIG. 8 is a diagram illustrating an example of a processing sequence, (a) is a diagram illustrating a processing sequence 110 of a broadcast receiving apparatus as a comparative example, and (b) is a diagram illustrating a processing sequence 11 of the broadcast receiving apparatus 1. is there. It is assumed that the broadcast receiving apparatus as the comparative example can set a 6 MHz filter and an 8 MHz filter for the analog demodulation processing circuit.
　（比較例におけるチャンネルサーチ処理）
　図７に示すように、比較例としての放送受信装置では、まず、ＡＦＣまたはＡＦＴを用いて、テレビジョン信号が存在する可能性がある全周波数範囲において、チューナに設定する可能性がある局部発振周波数を１つ検出し、局部発振周波数を中心としたテレビジョン信号の局を有する周波数帯域を対象周波数帯域としてチューナに設定し（Ｓ１０１：チューナ周波数帯域設定）、ＡＴＶ信号の存在を確認することにより、その周波数帯域に局が存在するか否かを判定する（Ｓ１０２）。局が存在しない場合には（Ｓ１０２でＮＯ）、Ｓ１０１の処理に戻る。 (Channel search process in comparative example)
As shown in FIG. 7, in the broadcast receiving apparatus as a comparative example, first, local oscillation that may be set in the tuner in the entire frequency range in which a television signal may exist using AFC or AFT. By detecting one frequency, setting the frequency band having the station of the television signal centered on the local oscillation frequency as the target frequency band (S101: Tuner frequency band setting), and confirming the presence of the ATV signal Then, it is determined whether or not a station exists in the frequency band (S102). If there is no station (NO in S102), the process returns to S101.
　局の存在が確認できた場合には（Ｓ１０２でＹＥＳ）、まず６ＭＨｚのフィルタをアナログ復調処理回路に設定し（Ｓ１０３）、アナログ復調処理回路から出力された復調信号の放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（Ｓ１０４）。 If the presence of the station can be confirmed (YES in S102), a 6 MHz filter is first set in the analog demodulation processing circuit (S103), and the broadcast system (color system and sound) of the demodulated signal output from the analog demodulation processing circuit is set. It is confirmed whether or not (system) is valid (S104).
　放送方式が有効であると判定された場合（Ｓ１０４でＹＥＳ）、上記設定された周波数帯域に含まれるテレビジョン信号が有効な信号であると確認できるため（Ｓ１０５）、当該周波数帯域の局登録を行う（Ｓ１０６）。 If it is determined that the broadcasting system is valid (YES in S104), it can be confirmed that the television signal included in the set frequency band is a valid signal (S105). Perform (S106).
　一方、放送方式が有効でないと判定された場合（Ｓ１０４でＮＯ）、上記設定された周波数帯域に含まれるテレビジョン信号が有効な信号でないと確認できる（Ｓ１０８）。この場合、次に８ＭＨｚのフィルタをアナログ復調処理回路に設定し（Ｓ１０９）、アナログ復調処理回路から出力された復調信号の放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（Ｓ１１０）。 On the other hand, if it is determined that the broadcasting system is not valid (NO in S104), it can be confirmed that the television signal included in the set frequency band is not a valid signal (S108). In this case, an 8 MHz filter is then set in the analog demodulation processing circuit (S109), and it is confirmed whether the broadcast system (color system and sound system) of the demodulated signal output from the analog demodulation processing circuit is valid. (S110).
　放送方式が有効であると判定された場合（Ｓ１１０でＹＥＳ）、上記設定された周波数帯域を有するテレビジョン信号が有効な信号であると確認できるため（Ｓ１１１）、当該周波数帯域の局登録を行う（Ｓ１０６）。一方、放送方式が有効でないと判定された場合（Ｓ１１０でＮＯ）、設定可能なフィルタが存在しないため、検出された周波数帯域の局登録を行わない（Ｓ１１２）。 If it is determined that the broadcasting system is valid (YES in S110), the television signal having the set frequency band can be confirmed to be a valid signal (S111), and station registration for the frequency band is performed. (S106). On the other hand, when it is determined that the broadcasting system is not valid (NO in S110), there is no settable filter, and station registration of the detected frequency band is not performed (S112).
　そして、上記局登録処理（Ｓ１０６またはＳ１１２の処理）が上記全周波数範囲の最高周波数に最も近い周波数帯域に対する局登録処理であったか否かを判定する（Ｓ１０７）。当該周波数帯域に対する局登録処理であった場合には（Ｓ１０７でＹＥＳ）、これ以上設定可能な周波数帯域が存在しないので、チャンネルサーチ処理を終了する。一方、上記周波数帯域に対する局登録処理でなかった場合には（Ｓ１０７でＮＯ）、まだ設定可能な周波数帯域が存在するため、Ｓ１０１の処理に戻り、次の局部発振周波数を１つ検出して、Ｓ１０２以降の処理を行う。 Then, it is determined whether or not the station registration process (S106 or S112 process) is a station registration process for a frequency band closest to the highest frequency in the entire frequency range (S107). If it is the station registration process for the frequency band (YES in S107), there is no more frequency band that can be set, and the channel search process is terminated. On the other hand, if it is not the station registration process for the frequency band (NO in S107), since there is still a settable frequency band, the process returns to the process of S101 to detect one next local oscillation frequency, The process after S102 is performed.
　（比較）
　次に、放送受信装置１と、比較例としての放送受信装置とにおけるチャンネルサーチ処理の違いについて、図８に基づいて説明する。図８では、ＡＡＡ ＭＨｚ、ＢＢＢ ＭＨｚ、ＣＣＣ ＭＨｚの各周波数帯域に対して放送方式の判別処理を行う場合について説明する。 (Comparison)
Next, a difference in channel search processing between the broadcast receiving apparatus 1 and a broadcast receiving apparatus as a comparative example will be described with reference to FIG. In FIG. 8, a case will be described in which a broadcast system discrimination process is performed for each frequency band of AAA MHz, BBB MHz, and CCC MHz.
　すなわち、図８の（ａ）は、図７の処理をＡＡＡ ＭＨｚ、ＢＢＢ ＭＨｚ、ＣＣＣ ＭＨｚの周波数帯域順に行った場合の処理シーケンス１１０を示すものであり、図８の（ｂ）は、図５および図６の処理をＡＡＡ ＭＨｚ、ＢＢＢ ＭＨｚ、ＣＣＣ ＭＨｚの周波数帯域に対して行った場合の処理シーケンス１１を示すものである。 8A shows a processing sequence 110 when the processing of FIG. 7 is performed in the order of the frequency bands of AAA MHz, BBB MHz, and CCC MHz, and FIG. 8B shows FIG. 7 shows a processing sequence 11 when the processing of FIG. 6 is performed for the frequency bands of AAA MHz, BBB MHz, and CCC MHz.
　図８の（ａ）に示すように、比較例の処理シーケンス１１０においては、まず、ＡＡＡ ＭＨｚのチャンネルサーチを開始する（処理シーケンス１１０の「チャンネルサーチ　ＡＡＡ ＭＨｚ」）。すなわち、ＡＡＡ ＭＨｚの周波数帯域に局が存在することを確認すると、６ＭＨｚのフィルタをアナログ復調処理回路に設定した後（処理シーケンス１１０の「６ＭＨｚ帯域フィルタ設定」）、放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（処理シーケンス１１０の「カラー判別・サウンド判別」）。そして、放送方式が有効でないと判定された場合には、次に８ＭＨｚのフィルタをアナログ復調処理回路に設定した後（処理シーケンス１１０の「８ＭＨｚ帯域フィルタ設定」）、再度放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する。 As shown in FIG. 8A, in the processing sequence 110 of the comparative example, first, the AAA チ ャ ン ネ ル MHz channel search is started (“channel search AAA MHz” in the processing sequence 110). That is, when it is confirmed that a station exists in the AAA MHz frequency band, a 6 MHz filter is set in the analog demodulation processing circuit ("6 MHz band filter setting" in the processing sequence 110), and then a broadcasting system (color system and sound system). ) Is valid (“color discrimination / sound discrimination” in the processing sequence 110). If it is determined that the broadcasting system is not valid, the 8 MHz filter is set in the analog demodulation processing circuit (“8 MHz band filter setting” in the processing sequence 110), and then the broadcasting system (color system and sound is set again). Check whether the system is valid.
　そして、上記の処理が、ＢＢＢ ＭＨｚの周波数帯域、ＣＣＣ ＭＨｚの周波数帯域の順に行われる。すなわち、比較例においては、周波数帯域ごとに、６ＭＨｚのフィルタおよび８Ｍｈｚのフィルタの両方を適用して、それぞれのフィルタに対する放送方式の判別を行う可能性がある。 The above processing is performed in the order of the BBBＢMHz frequency band and the CCC MHz frequency band. That is, in the comparative example, there is a possibility that both the 6 MHz filter and the 8 MHz filter are applied for each frequency band, and the broadcasting system for each filter is determined.
　一方、図８の（ｂ）に示すように、本実施形態の放送受信装置１における処理シーケンス１１は、チャンネルサーチ処理を開始すると、まず、局の存在する可能性のある最低周波数から最高周波数までの間で、どの周波数に局部発振周波数が存在するかを検出し、ＡＡＡ ＭＨｚ、ＢＢＢ ＭＨｚ、ＣＣＣ ＭＨｚのそれぞれの局部発振周波数を取得する（処理シーケンス１１の「チャンネルサーチ　ＡＡＡ ＭＨｚ」、「チャンネルサーチ　ＢＢＢ ＭＨｚ」、「チャンネルサーチ　ＣＣＣ ＭＨｚ」）。 On the other hand, as shown in FIG. 8B, in the processing sequence 11 in the broadcast receiving apparatus 1 of the present embodiment, when the channel search process is started, first, from the lowest frequency where the station may exist to the highest frequency. Between the local oscillation frequencies of AAA MHz, BBB MHz, and CCC MHz, and the local oscillation frequencies of AAA （MHz, CCC MHz are acquired ("channel search AAA MHz" and "channel search of processing sequence 11"). BBB MHz "," Channel search CCC MHz ").
　その後、まずＡＡＡ ＭＨｚの周波数帯域に作用させるフィルタを、隣接する周波数帯域との間隔に基づいて選択する。具体的には、最低周波数、最高周波数、ＡＡＡ ＭＨｚ～ＣＣＣ ＭＨｚの各周波数帯域の中心周波数とのそれぞれ間隔を算出する。そして、その間隔のうち、ＡＡＡ ＭＨｚの中心周波数と最低周波数との間隔を第１間隔とし、ＡＡＡ ＭＨｚの中心周波数とＢＢＢ ＭＨｚの中心周波数との間隔を第２間隔として、フィルタテーブルＴ１またはＴ２を参照することにより、ＡＡＡ ＭＨｚの周波数帯域に作用させるフィルとして適した６ＭＨｚのフィルタを選択する（処理シーケンス１１の「フィルタ選択（６ＭＨｚフィルタ選択）」）。そして、６ＭＨｚのフィルタをアナログ復調処理回路３３に設定した後（処理シーケンス１１の「６ＭＨｚ帯域フィルタ設定」）、放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（処理シーケンス１１の「カラー判別・サウンド判別」）。 Then, first, a filter to be applied to the AAA MHz frequency band is selected based on the interval between adjacent frequency bands. Specifically, the minimum frequency, the maximum frequency, and the interval with the center frequency of each frequency band of AAA MHz to CCC MHz are calculated. Of the intervals, the filter table T1 or T2 is defined by setting the interval between the center frequency of AAA と MHz and the lowest frequency as the first interval, and the interval between the center frequency of AAA MHz and the center frequency of BBB MHz as the second interval. By referring to this, a 6 MHz filter suitable as a fill to be applied to the AAA MHz frequency band is selected ("filter selection (6 MHz filter selection) in processing sequence 11"). Then, after setting the 6 MHz filter in the analog demodulation processing circuit 33 (“6 MHz band filter setting” in the processing sequence 11), it is confirmed whether or not the broadcasting system (color system and sound system) is valid (processing sequence). 11 “Color discrimination / Sound discrimination”).
　次に、ＢＢＢ ＭＨｚの周波数帯域に作用させるフィルタを、隣接する周波数帯域との間隔に基づいて、ＢＢＢ ＭＨｚの周波数帯域に適したフィルタとして８ＭＨｚのフィルタを選択し（処理シーケンス１１の「フィルタ選択（８ＭＨｚフィルタ選択）」）、当該フィルタを設定する（処理シーケンス１１の「８ＭＨｚ帯域フィルタ設定」）。そして、放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（処理シーケンス１１の「カラー判別・サウンド判別」）。 Next, an 8 MHz filter is selected as a filter suitable for the BBB MHz frequency band based on the interval between the adjacent frequency bands and the filter that acts on the BBB MHz frequency band ("Filter selection ( 8 MHz filter selection))), and the filter is set ("8 MHz band filter setting" in the processing sequence 11). Then, it is confirmed whether or not the broadcasting system (color system and sound system) is valid ("color discrimination / sound discrimination" in the processing sequence 11).
　その次に、ＣＣＣ ＭＨｚの周波数帯域に作用させるフィルタを、隣接する周波数帯域との間隔に基づいて、ＣＣＣ ＭＨｚの周波数帯域に適したフィルタとして６ＭＨｚおよび８ＭＨｚのフィルタを選択する（処理シーケンス１１の「フィルタ選択（６ＭＨｚと８ＭＨｚフィルタ選択）」）。この場合、処理シーケンス１１では、まず６ＭＨｚのフィルタを設定し（処理シーケンス１１の「６ＭＨｚ帯域フィルタ設定」）、放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（処理シーケンス１１の「カラー判別・サウンド判別」）。その後、放送方式が有効でないと判定された場合には、８ＭＨｚのフィルタを設定し（処理シーケンス１１の「８ＭＨｚ帯域フィルタ設定」）、放送方式（カラーシステムおよびサウンドシステム）が有効であるか否かを確認する（処理シーケンス１１の「カラー判別・サウンド判別」）。 Next, a filter of 6 MHz and 8 MHz is selected as a filter suitable for the frequency band of CCC MHz based on the interval between the adjacent frequency bands for the filter that operates on the frequency band of CCC MHz ("processing sequence 11" Filter selection (6 MHz and 8 MHz filter selection) "). In this case, in the processing sequence 11, a 6 MHz filter is first set ("6 MHz band filter setting" in the processing sequence 11), and it is confirmed whether or not the broadcasting system (color system and sound system) is valid (processing sequence). 11 “Color discrimination / Sound discrimination”). Thereafter, when it is determined that the broadcasting system is not valid, an 8 MHz filter is set (“8 MHz band filter setting” in the processing sequence 11), and whether the broadcasting system (color system and sound system) is valid. Is confirmed ("color discrimination / sound discrimination" in the processing sequence 11).
　なお、図６に示すように、ＣＣＣ ＭＨｚの周波数帯域に作用させるフィルタとしては、地域別に設定された周波数帯域を用いて、６ＭＨｚおよび８ＭＨｚのフィルタのいずれかを選択して、その選択したフィルタの設定および放送方式の判別を行う構成であってもよい。 As shown in FIG. 6, as a filter that acts on the frequency band of CCC MHz, one of 6 MHz and 8 MHz filters is selected using the frequency band set for each region, and the filter of the selected filter is selected. It may be configured to determine the setting and the broadcasting system.
　このように、放送受信装置１では、比較例とは異なり、全周波数範囲に存在する局を有する周波数帯域の全てを検出した後に、それぞれの周波数帯域に対してフィルタを作用させる。また、各周波数帯域に作用させるフィルタは、放送方式の判別を行う周波数帯域（対象周波数帯域）に隣接する周波数帯域との間隔に基づいて選択される。すなわち、比較例とは異なり、チャンネルサーチ時の全ての周波数帯域に対する局判別処理を行った後に、各周波数帯域に対する放送方式判別処理を行うというように、局判別処理と放送方式判別処理とを別々のタイミングで実施している。 Thus, unlike the comparative example, in the broadcast receiving apparatus 1, after detecting all the frequency bands having stations existing in the entire frequency range, the filter is applied to each frequency band. Further, the filter to be applied to each frequency band is selected based on the interval between the frequency band adjacent to the frequency band (target frequency band) for determining the broadcasting system. That is, unlike the comparative example, the station discrimination process and the broadcast system discrimination process are performed separately, such as performing the broadcast system discrimination process for each frequency band after performing the station discrimination process for all frequency bands at the time of channel search. It is carried out at the timing.
　それゆえ、放送受信装置１では、対象周波数帯域に作用させるフィルタが、隣接する周波数帯域に含まれるテレビジョン信号の一部にまで作用してしまうことを防止することができる。すなわち、対象周波数帯域に対応した適切なフィルタを選択して作用させることができる。 Therefore, in the broadcast receiving apparatus 1, it is possible to prevent the filter that acts on the target frequency band from acting on a part of the television signal included in the adjacent frequency band. That is, an appropriate filter corresponding to the target frequency band can be selected and operated.
　また、放送受信装置１においては、不適切なフィルタを対象周波数帯域に作用させることを防ぐことができるので、比較例において生じる可能性がある放送方式の誤判別を防ぐことができる。すなわち、放送受信装置１では、比較例に比べて、より精度の高い放送方式の判別を行うことができる。また、放送受信装置１では、不適切なフィルタを作用させた場合に生じる処理時間分を短縮することも可能である。 Also, in the broadcast receiving apparatus 1, it is possible to prevent an inappropriate filter from acting on the target frequency band, and thus it is possible to prevent erroneous determination of the broadcast system that may occur in the comparative example. That is, the broadcast receiving apparatus 1 can determine the broadcast method with higher accuracy than the comparative example. In the broadcast receiving apparatus 1, it is also possible to reduce the processing time that occurs when an inappropriate filter is applied.
　したがって、放送受信装置１では、複数の放送方式が混在したアナログ放送環境において、従来のように一意的なフィルタ制御による放送方式の誤判別を行うことなく、精度の高い放送方式の判別を行うことができる。 Therefore, in the broadcast receiving apparatus 1, in an analog broadcasting environment in which a plurality of broadcasting systems are mixed, it is possible to determine the broadcasting system with high accuracy without performing erroneous determination of the broadcasting system by unique filter control as in the past. Can do.
　（処理時間の比較）
　ここで、放送受信装置１と比較例とにおける、チャンネルサーチ処理時間の差の具体例について説明する。 (Comparison of processing time)
Here, a specific example of the difference in channel search processing time between the broadcast receiving apparatus 1 and the comparative example will be described.
　この例では、局を有する周波数帯域が、「５３４．２５ＭＨｚ」、「５４２．２５ＭＨｚ」、「５５０．２５ＭＨｚ」および「５５８．２５ＭＨｚ」である場合について説明する。また、放送受信装置１および比較例において、
（１）チューナ周波数帯域設定および局判別の処理におよそ２００ｍｓ、
（２）フィルタを設定し安定した信号が抽出されるまでにおよそ３００ｍｓ、
（３）放送方式の判別におよそ２００ｍｓ
の処理時間を要するものとする。 In this example, a case will be described in which the frequency bands having the stations are “534.25 MHz”, “542.25 MHz”, “550.25 MHz”, and “558.25 MHz”. In the broadcast receiving device 1 and the comparative example,
(1) About 200 ms for tuner frequency band setting and station discrimination processing;
(2) About 300 ms until a filter is set and a stable signal is extracted,
(3) About 200 ms for broadcasting system discrimination
It takes a long processing time.
　この場合、比較例においては、周波数帯域ごとに上記（１）～（３）の処理が行われるので、比較例におけるチャンネルサーチ処理時間は、
　｛（１）＋（２；６ＭＨｚのフィルタ設定）＋（３）
　　＋（２；８ＭＨｚのフィルタ設定）＋（３）｝×４　＝　４８００ｍｓ
となる。すなわち、最大およそ４．８秒で、全ての周波数帯域の放送方式の判別が完了する。 In this case, in the comparative example, since the processes (1) to (3) are performed for each frequency band, the channel search processing time in the comparative example is
{(1) + (2; 6 MHz filter setting) + (3)
+ (2; 8 MHz filter setting) + (3)} × 4 = 4800 ms
It becomes. That is, the determination of the broadcasting system for all frequency bands is completed in a maximum of about 4.8 seconds.
　一方、放送受信装置１においては、局を有する周波数帯域を全て検出した後に、上記（１）～（３）の処理が行われるので、フィルタ選択処理の時間を加えると、放送受信装置１におけるチャンネルサーチ処理時間は、
　｛（１）×４｝＋｛（１）
　　＋フィルタ選択（およそ１００ｍｓ）＋（２）＋（３）｝×４　＝　４０００ｍｓ
となり、およそ４．０秒で、全ての周波数帯域の放送方式の判別が完了する。すなわち、放送受信装置１では、比較例に比べて最大でおよそ０．８秒、処理時間を短縮することができる。 On the other hand, in the broadcast receiving apparatus 1, the processing of (1) to (3) is performed after all the frequency bands having stations are detected. Therefore, if the time for filter selection processing is added, the channel in the broadcast receiving apparatus 1 The search processing time is
{(1) × 4} + {(1)
+ Filter selection (approximately 100 ms) + (2) + (3)} × 4 = 4000 ms
Thus, in about 4.0 seconds, the determination of the broadcasting system for all frequency bands is completed. That is, in the broadcast receiving apparatus 1, the processing time can be shortened by about 0.8 seconds at the maximum as compared with the comparative example.
　〔ソフトウェアによる実現例〕
　放送受信装置１の制御ブロック（特に制御部５が備える各部）は、集積回路（ＩＣチップ）等に形成された論理回路（ハードウェア）によって実現してもよいし、ＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。 [Example of software implementation]
The control block (especially each part with which the control part 5 is equipped) of the broadcast receiving apparatus 1 may be implement | achieved by the logic circuit (hardware) formed in the integrated circuit (IC chip) etc., and CPU (Central Processing Unit) is comprised. And may be realized by software.
　後者の場合、放送受信装置１は、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラムおよび各種データがコンピュータ（またはＣＰＵ）で読み取り可能に記録されたＲＯＭ（Read Only Memory）または記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ（Random Access Memory）などを備えている。そして、コンピュータ（またはＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、本発明の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体（通信ネットワークや放送波等）を介して上記コンピュータに供給されてもよい。なお、本発明は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In the latter case, the broadcast receiving apparatus 1 includes a CPU that executes instructions of a program that is software for realizing each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU). Alternatively, a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
　〔まとめ〕
　本発明の態様１に係る放送受信装置（１）は、
　アナログ放送波（テレビジョン信号）を受信可能な放送受信装置であって、
　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出手段（局部発振周波数検出部５１）と、
　上記局部発振周波数検出手段が検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択手段（フィルタ選択部５４）と、を備えている。 [Summary]
The broadcast receiving device (1) according to the aspect 1 of the present invention includes:
A broadcast receiver capable of receiving an analog broadcast wave (television signal),
Local oscillation frequency detection means (local oscillation frequency detection unit 51) for detecting the frequency of each of the plurality of stations;
Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station among the frequencies detected by the local oscillation frequency detecting means and the frequency band adjacent to the target frequency band. Filter selection means (filter selection unit 54) for selecting a filter having a predetermined frequency band.
　また、本発明の態様６に係る放送受信装置（１）の制御方法は、
　アナログ放送波を受信可能な放送受信装置の制御方法であって、
　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出ステップ（Ｓ１～Ｓ５）と、
　上記局部発振周波数検出ステップにおいて検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択ステップ（Ｓ１３）と、を含んでいる。 Moreover, the control method of the broadcast receiver (1) according to the aspect 6 of the present invention is as follows:
A control method for a broadcast receiving apparatus capable of receiving an analog broadcast wave,
A local oscillation frequency detecting step (S1 to S5) for detecting a frequency of each of the plurality of stations;
Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station and the frequency band adjacent to the target frequency band among the frequencies detected in the local oscillation frequency detection step. And a filter selection step (S13) for selecting a filter having a predetermined frequency band.
　上記の構成によれば、検出された複数の局のそれぞれが有する周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、所定の周波数帯域を有するフィルタを選択する。そのため、対象周波数帯域に作用させるフィルタが、隣接する周波数帯域に含まれるアナログ放送波の一部にまで作用してしまうことを防止することができる。すなわち、対象周波数帯域に対応した適切なフィルタを選択して作用させることができる。 According to said structure, according to the space | interval of the target frequency band which is a frequency band which has the detected station among the frequencies which each of the detected some station has, and the frequency band adjacent to the said target frequency band A filter having a predetermined frequency band is selected. Therefore, it is possible to prevent the filter that acts on the target frequency band from acting on a part of the analog broadcast wave included in the adjacent frequency band. That is, an appropriate filter corresponding to the target frequency band can be selected and operated.
　一般に、アナログ放送においては、受信するアナログ放送波に対応した適切なフィルタを作用させないと、放送方式（カラーシステムおよびサウンドシステム）の正確な判別を行うことができず、結果として正確な局登録を行うことができない。そして、このような状況は、異なる放送方式で規定されたアナログ放送波が混信している状態において特に起こり得る。 In general, in an analog broadcast, unless an appropriate filter corresponding to the received analog broadcast wave is applied, an accurate determination of the broadcast system (color system and sound system) cannot be made, and as a result, an accurate station registration is performed. I can't do it. Such a situation can occur particularly in a state where analog broadcast waves defined by different broadcasting systems are interfering.
　本発明の一態様に係る放送受信装置およびその制御方法によれば、上述のように、対象周波数帯域に対応した適切なフィルタを選択できるので、放送方式の正確な判別を行うことが可能となる。すなわち、アナログ放送における放送方式の検出精度を向上させることができる。 According to the broadcast receiving apparatus and the control method thereof according to one aspect of the present invention, as described above, an appropriate filter corresponding to the target frequency band can be selected, so that it is possible to accurately determine the broadcast system. . That is, it is possible to improve the detection accuracy of the broadcasting system in analog broadcasting.
　また、対象周波数帯域に対応した適切なフィルタを選択できるので、不適切なフィルタの選択によって、再度適切なフィルタ選択を行うといった処理の発生を防ぐことができる。それゆえ、チャンネルサーチにおける処理時間の短縮を図ることも可能となる。 Also, since an appropriate filter corresponding to the target frequency band can be selected, it is possible to prevent the occurrence of processing such as selecting an appropriate filter again by selecting an inappropriate filter. Therefore, it is possible to shorten the processing time in the channel search.
　さらに、本発明の態様２に係る放送受信装置では、上記態様１において、
　上記フィルタ選択手段が選択する上記フィルタの所定の周波数帯域は、
（１）上記対象周波数帯域の中心周波数と、当該対象周波数帯域に隣接する、当該対象周波数帯域よりも低い周波数帯域である低隣接周波数帯域の中心周波数との第１間隔と、（２）上記対象周波数帯域の中心周波数と、当該対象周波数帯域に隣接する、当該対象周波数帯域よりも高い周波数帯域である高隣接周波数帯域の中心周波数との第２間隔と、に対応付けられており、
　上記フィルタ選択手段は、上記第１間隔および上記第２間隔に基づいて、上記フィルタを選択することが好ましい。 Furthermore, in the broadcast receiver according to aspect 2 of the present invention, in the above aspect 1,
The predetermined frequency band of the filter selected by the filter selecting means is
(1) a first interval between a center frequency of the target frequency band and a center frequency of a low adjacent frequency band that is adjacent to the target frequency band and is lower than the target frequency band; and (2) the target And a second interval between the center frequency of the frequency band and the center frequency of the high adjacent frequency band that is adjacent to the target frequency band and is higher than the target frequency band,
Preferably, the filter selection means selects the filter based on the first interval and the second interval.
　上記の構成によれば、フィルタ選択手段は、対象周波数帯域と、対象周波数帯域の両隣りの周波数帯域（低隣接周波数帯域および高隣接周波数帯域）との間隔である第１間隔と第２間隔に基づいて、第１間隔および第２間隔に対応付けられた所定の周波数帯域を有するフィルタを選択する。 According to said structure, a filter selection means is a 1st space | interval and a 2nd space | interval which are the space | intervals of an object frequency band and the frequency band (a low adjacent frequency band and a high adjacent frequency band) of both sides of an object frequency band. Based on this, a filter having a predetermined frequency band associated with the first interval and the second interval is selected.
　それゆえ、選択されたフィルタが、対象周波数帯域の両隣りの周波数帯域の一部に対して作用することを防ぐことができる。すなわち、対象周波数帯域に適切なフィルタを作用させることができる。 Therefore, it is possible to prevent the selected filter from acting on a part of the frequency band on both sides of the target frequency band. That is, an appropriate filter can be applied to the target frequency band.
　さらに、本発明の態様３に係る放送受信装置では、上記態様１または２において、
　上記フィルタ選択手段は、選択した上記フィルタが複数存在する場合には、予め地域別に設定されている周波数帯域と一致する周波数帯域を有するフィルタを、上記対象周波数帯域に作用させることが好ましい。 Furthermore, in the broadcast receiving device according to aspect 3 of the present invention, in the above aspect 1 or 2,
When there are a plurality of the selected filters, the filter selection means preferably causes a filter having a frequency band that matches a frequency band set in advance for each region to act on the target frequency band.
　上記の構成によれば、選択したフィルタが複数存在する場合であっても、その中から１つのフィルタを選択することができる。また、選択したフィルタの中から、地域別に設定されている周波数帯域と一致する周波数帯域を有するフィルタを選択するので、対象周波数帯域のフィルタとして、適切である可能性の高いフィルタを選択することができる。 According to the above configuration, even when there are a plurality of selected filters, one filter can be selected from them. Further, since a filter having a frequency band that matches the frequency band set for each region is selected from the selected filters, it is possible to select a filter that is likely to be appropriate as a filter for the target frequency band. it can.
　さらに、本発明の態様４に係る放送受信装置では、上記態様１から３のいずれかにおいて、
　上記アナログ放送波を復調して復調信号を生成する復調回路（アナログ復調処理回路３３）を備え、
　上記復調回路は、上記フィルタ選択手段によって選択された上記フィルタを、上記対象周波数帯域に含まれる上記復調信号に作用させることが好ましい。 Furthermore, in the broadcast receiving device according to aspect 4 of the present invention, in any of the above aspects 1 to 3,
A demodulation circuit (analog demodulation processing circuit 33) for demodulating the analog broadcast wave to generate a demodulated signal;
The demodulating circuit preferably causes the filter selected by the filter selecting means to act on the demodulated signal included in the target frequency band.
　上記の構成によれば、復調回路に選択されたフィルタを設定し、復調回路において生成された復調信号に対して当該フィルタを作用させることができる。それゆえ、一般に復調回路の後段において行われる放送方式の判別において、適切な判別結果を得ることが可能となる。 According to the above configuration, the selected filter can be set in the demodulation circuit, and the filter can be applied to the demodulated signal generated in the demodulation circuit. Therefore, it is possible to obtain an appropriate discrimination result in discrimination of the broadcasting system generally performed in the subsequent stage of the demodulation circuit.
　さらに、本発明の態様５に係る放送受信装置では、上記態様４において、
　上記復調回路が上記フィルタを作用させた復調信号の放送方式を判別する放送方式判別手段を備えていることが好ましい。 Furthermore, in the broadcast receiving device according to aspect 5 of the present invention, in the above aspect 4,
It is preferable that the demodulating circuit includes a broadcasting system discrimination means for discriminating a broadcasting system of the demodulated signal on which the filter is applied.
　上記の構成によれば、放送方式判別手段は、フィルタ選択手段によって選択されたフィルタを作用させた復調信号の放送方式を判別する。それゆえ、その復調信号に適した判別結果を得ることができるので、対象周波数領域の局登録を、確実にかつ正確に行うことができる。 According to the above configuration, the broadcast system discrimination means discriminates the broadcast system of the demodulated signal on which the filter selected by the filter selection means is applied. Therefore, since a discrimination result suitable for the demodulated signal can be obtained, station registration in the target frequency region can be performed reliably and accurately.
　さらに、本発明の各態様に係る放送受信装置は、コンピュータによって実現してもよく、この場合には、コンピュータを上記放送受信装置が備える各手段として動作させることにより上記放送受信装置をコンピュータにて実現させる放送受信装置の放送受信プログラム、およびそれを記録したコンピュータ読み取り可能な記録媒体も、本発明の範疇に入る。 Furthermore, the broadcast receiving apparatus according to each aspect of the present invention may be realized by a computer. In this case, the broadcast receiving apparatus is operated by a computer by causing the computer to operate as each unit included in the broadcast receiving apparatus. A broadcast receiving program of a broadcast receiving apparatus to be realized and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.
　（その他の構成）
　さらに、本発明の一態様に係る放送受信装置は、チャンネルサーチにおいて、対象周波数帯域と、当該対象周波数帯域に隣り合う周波数帯域との間隔に応じて、当該対象周波数帯域に作用させるフィルタ帯域幅を選択する構成ともいえる。 (Other configurations)
Furthermore, in the channel search, the broadcast receiving device according to one aspect of the present invention has a filter bandwidth that acts on the target frequency band according to an interval between the target frequency band and a frequency band adjacent to the target frequency band. It can be said that the configuration is selected.
　〔付記事項〕
　本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。 [Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.
　本発明は、複数の放送局から異なる放送方式で規定されたアナログ放送波を受信可能な放送受信装置に好適に利用することができる。 The present invention can be suitably used for a broadcast receiving apparatus that can receive analog broadcast waves defined by a plurality of broadcast stations using different broadcast systems.
　１　　放送受信装置
　３３　アナログ復調処理回路（復調回路）
　５１　局部発振周波数検出部（局部発振周波数検出手段）
　５４　フィルタ選択部（フィルタ選択手段）
　６１　システム判別部（放送方式判別手段） 1 Broadcast receiver 33 Analog demodulation processing circuit (demodulation circuit)
51 Local oscillation frequency detector (local oscillation frequency detector)
54 Filter selection section (filter selection means)
61 System discriminator (broadcast system discriminating means)

Claims (8)

  1. 　アナログ放送波を受信可能な放送受信装置であって、
    　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出手段と、
    　上記局部発振周波数検出手段が検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択手段と、を備えていることを特徴とする放送受信装置。     A broadcast receiver capable of receiving analog broadcast waves,
    Local oscillation frequency detection means for detecting the frequency of each of the plurality of stations;
    Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station among the frequencies detected by the local oscillation frequency detecting means and the frequency band adjacent to the target frequency band. And a filter selection means for selecting a filter having a predetermined frequency band.
  2. 　上記フィルタ選択手段が選択する上記フィルタの所定の周波数帯域は、
    （１）上記対象周波数帯域の中心周波数と、当該対象周波数帯域に隣接する、当該対象周波数帯域よりも低い周波数帯域である低隣接周波数帯域の中心周波数との第１間隔と、（２）上記対象周波数帯域の中心周波数と、当該対象周波数帯域に隣接する、当該対象周波数帯域よりも高い周波数帯域である高隣接周波数帯域の中心周波数との第２間隔と、に対応付けられており、
    　上記フィルタ選択手段は、上記第１間隔および上記第２間隔に基づいて、上記フィルタを選択することを特徴とする請求項１に記載の放送受信装置。     The predetermined frequency band of the filter selected by the filter selecting means is
    (1) a first interval between a center frequency of the target frequency band and a center frequency of a low adjacent frequency band that is adjacent to the target frequency band and is lower than the target frequency band; and (2) the target And a second interval between the center frequency of the frequency band and the center frequency of the high adjacent frequency band that is adjacent to the target frequency band and is higher than the target frequency band,
    The broadcast receiving apparatus according to claim 1, wherein the filter selection unit selects the filter based on the first interval and the second interval.
  3. 　上記フィルタ選択手段は、選択した上記フィルタが複数存在する場合には、予め地域別に設定されている周波数帯域と一致する周波数帯域を有するフィルタを、上記対象周波数帯域に作用させることを特徴とする請求項１または２に記載の放送受信装置。 The filter selection means, when there are a plurality of the selected filters, causes a filter having a frequency band that matches a frequency band set in advance for each region to act on the target frequency band. Item 3. The broadcast receiving device according to Item 1 or 2.
  4. 　上記アナログ放送波を復調して復調信号を生成する復調回路と、
    　上記復調回路は、上記フィルタ選択手段によって選択された上記フィルタを、上記対象周波数帯域に含まれる上記復調信号に作用させることを特徴とする請求項１から３のいずれか１項に記載の放送受信装置。     A demodulation circuit that demodulates the analog broadcast wave to generate a demodulated signal;
    The broadcast reception according to any one of claims 1 to 3, wherein the demodulation circuit causes the filter selected by the filter selection means to act on the demodulated signal included in the target frequency band. apparatus.
  5. 　上記復調回路が上記フィルタを作用させた復調信号の放送方式を判別する放送方式判別手段を備えていることを特徴とする請求項４に記載の放送受信装置。 5. The broadcast receiving apparatus according to claim 4, wherein the demodulating circuit includes a broadcasting system discriminating means for discriminating a broadcasting system of a demodulated signal having the filter applied thereto.
  6. 　アナログ放送波を受信可能な放送受信装置の制御方法であって、
    　複数の局のそれぞれが有する周波数を検出する局部発振周波数検出ステップと、
    　上記局部発振周波数検出ステップにおいて検出した上記周波数のうちの検出した局を有する周波数帯域である対象周波数帯域と、当該対象周波数帯域に隣接する周波数帯域との間隔に応じて、当該対象周波数帯域に作用させる、所定の周波数帯域を有するフィルタを選択するフィルタ選択ステップと、を含むことを特徴とする放送受信装置の制御方法。     A control method for a broadcast receiving apparatus capable of receiving an analog broadcast wave,
    A local oscillation frequency detection step for detecting a frequency of each of the plurality of stations;
    Acts on the target frequency band according to the interval between the target frequency band that is the frequency band having the detected station and the frequency band adjacent to the target frequency band among the frequencies detected in the local oscillation frequency detection step. And a filter selection step of selecting a filter having a predetermined frequency band.
  7. 　請求項１から５のいずれか１項に記載の放送受信装置としてコンピュータを機能させるための放送受信プログラムであって、コンピュータを上記各手段として機能させるための放送受信プログラム。 A broadcast receiving program for causing a computer to function as the broadcast receiving apparatus according to any one of claims 1 to 5, wherein the broadcast receiving program causes the computer to function as each of the above means.
  8. 　請求項７に記載の放送受信プログラムを記録したコンピュータ読み取り可能な記録媒体。 A computer-readable recording medium on which the broadcast receiving program according to claim 7 is recorded.
PCT/JP2013/059290 2013-03-28 2013-03-28 Broadcast reception device, method for controlling broadcast reception device, broadcast reception program, and computer-readable recording medium WO2014155611A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03187625A (en) * 1989-12-18 1991-08-15 Kenwood Corp Fm tuner
JP2008085395A (en) * 2006-09-25 2008-04-10 Kenwood Corp Fm tuner having band control function
JP2009268052A (en) * 2008-03-31 2009-11-12 Sony Corp Analog tv broadcast signal receiving apparatus and analog tv broadcast signal demodulating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03187625A (en) * 1989-12-18 1991-08-15 Kenwood Corp Fm tuner
JP2008085395A (en) * 2006-09-25 2008-04-10 Kenwood Corp Fm tuner having band control function
JP2009268052A (en) * 2008-03-31 2009-11-12 Sony Corp Analog tv broadcast signal receiving apparatus and analog tv broadcast signal demodulating apparatus

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