WO2006059550A1 - 受信装置および受信方法 - Google Patents
受信装置および受信方法 Download PDFInfo
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- WO2006059550A1 WO2006059550A1 PCT/JP2005/021702 JP2005021702W WO2006059550A1 WO 2006059550 A1 WO2006059550 A1 WO 2006059550A1 JP 2005021702 W JP2005021702 W JP 2005021702W WO 2006059550 A1 WO2006059550 A1 WO 2006059550A1
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- radio wave
- desired station
- intermediate frequency
- filter
- frequency band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
Definitions
- the present invention relates to a receiving device and a receiving method.
- the use of the present invention is not limited to the above-described receiving apparatus and receiving method.
- a receiving device that performs mobile reception of FM broadcast radio waves or AM broadcast radio waves may change the radio wave status of FM radio waves or AM radio waves (specifically, as the position of the receiving entity changes) (Receiving field strength, etc.) fluctuates, so the ARC (Automatic Reception Control) function that changes the reception state appropriately according to the change in the situation and the field strength of received radio waves are strong, starting from the broadcasting station. It has a BSM (Best Station Memory) function that automatically presets.
- BSM Best Station Memory
- a receiving device having an ARC function in general, a part of an FM radio signal or an AM radio signal output from an intermediate frequency amplification unit is extracted, and a DC voltage obtained by detecting the signal is used. A signal indicating the electric field intensity level of the signal, that is, an electric field intensity signal is detected. Based on this electric field strength signal, an ARC function, specifically, a separation control function, a high cut control function, and a mute control function are realized, and noise is reduced to improve hearing (for example, Patent Documents). See 1.) o
- a radio station is selected using the above-mentioned electric field strength signal, as in the case of the ARC function.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus having an ARC function.
- the receiving apparatus includes an antenna 101, a high frequency amplifier 102 including a high frequency amplifier circuit, a mixer 103, an intermediate frequency filter 104, and an intermediate frequency amplifier that also includes an intermediate frequency amplifier circuit force.
- Unit 105, detection unit 106, audio demodulation unit 107, ARC unit 108, and decoder 109 are provided as main components, and each of these components 101 to 109 is a transmission such as a coaxial cable. Each is connected by a road.
- the broadcast radio wave power received by the antenna 101 is transmitted to the high frequency amplifying unit 102 Is amplified at high frequency.
- the output of the high frequency amplifier 102 is output to the intermediate frequency filter 104 via the mixer 103, and the high frequency component is removed according to the characteristics of the intermediate frequency filter 104.
- the output of the intermediate frequency filter 104 is a force further input to the intermediate frequency amplification unit 105, and a part of the output is input to the detection unit 106 arranged in parallel with the intermediate frequency amplification unit 105.
- the output of the intermediate frequency filter 104 input to the intermediate frequency amplification unit 105 is amplified by the intermediate frequency amplification unit 105.
- the output from the intermediate frequency amplification unit 105 is processed by the audio demodulation unit 107 and then input to the ARC unit 108.
- the detection unit 106 detects an electric field intensity level (SL: Signal Level) output from the intermediate frequency filter 104 and outputs the detection result to the ARC unit 108.
- SL Signal Level
- the desired station radio wave As the broadcast wave of a desired broadcast station (hereinafter referred to as the desired station radio wave) can be selectively received and output, the noise becomes higher. Can be reduced to achieve a good audibility.
- the broadcast radio wave of the broadcast station adjacent to the desired broadcast station is also received, which becomes a disturbing radio wave and causes noise.
- the broadcast radio waves from neighboring stations that are strong will be called adjacent jamming radio waves.
- control is performed based on the electric field strength of the received radio wave as described above.
- the electric field strength used as a criterion for such control is derived from the radio wave of the desired station.
- the electric field strength derived from adjacent interfering radio waves is included. This is because the frequency band of the desired station radio wave and the adjacent interfering radio wave are close to each other, so that the intermediate frequency filter 104 cannot separate the desired station radio wave and the adjacent interfering radio wave.
- FM receiver FM receiver
- the adjacent interfering radio waves existing in the remote frequency band pass through the intermediate frequency filter 104 together with the desired station radio waves.
- Patent Document 1 Japanese Utility Model Publication No. 6-13247
- the ARC unit 108 controls the reception state based on the electric field strength including the component derived from the adjacent jamming wave in this way, the change in the electric field strength of the desired station radio wave is accurately detected due to the influence of the neighboring jamming radio wave. Can not be reflected. Therefore, it is difficult to appropriately control the reception state corresponding to the change in the state of the desired station radio wave.
- the ARC unit 108 performs control (so-called high cut control) to attenuate a high frequency component that is a noise component in the received radio wave.
- control so-called high cut control
- the electric field strength used as a criterion for setting the control amount of the control is! /
- the electric field strength of the desired station radio wave is weak, but the electric field strength of the adjacent interfering radio wave is strong. As a result, the overall electric field strength is increased.
- the ARC unit 108 determines the control amount setting criterion for the overall strong electric field strength including the electric field strength of the adjacent interfering radio waves even though the electric field strength of the desired station radio wave is weak. Therefore, the reduction in the electric field strength of the desired station radio wave is not properly reflected in the high cut control, and the attenuation amount of the high frequency component (that is, the control amount in the high cut control) is reduced.
- the receiving device includes an intermediate frequency acquisition unit that selectively acquires the intermediate frequency component out of a high frequency component and an intermediate frequency component of the received broadcast radio wave, and the intermediate frequency acquisition unit described above. Broadcasting of a desired station included in the intermediate frequency component acquired by Of the radio wave and the broadcast wave of the adjacent station, the desired station radio wave acquisition means that selectively acquires the broadcast radio wave of the desired station, and the electric field intensity of the broadcast radio wave of the desired station acquired by the desired station radio wave acquisition means is detected. The detection means and the intermediate frequency acquisition means output the input radio wave, and the detection result of the electric field strength in the detection means is input and output from the intermediate frequency acquisition means based on the detection result Reception control means for controlling the reception state of the radio wave.
- the reception method according to the invention of claim 6 includes an intermediate frequency acquisition step of selectively acquiring the intermediate frequency component out of a high frequency component and an intermediate frequency component of the received broadcast radio wave, and the intermediate frequency acquisition step described above.
- a desired station radio wave acquisition step for selectively acquiring a broadcast radio wave of the desired station out of a broadcast radio wave of a desired station and a broadcast radio wave of an adjacent station included in the intermediate frequency component acquired in the Based on the detection step of detecting the electric field strength of the broadcast wave of the desired station acquired in the acquisition step and the electric field strength of the desired station acquired in the detection step, the acquisition is performed in the intermediate frequency acquisition step.
- a reception control step for controlling a reception state of the intermediate frequency component.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus.
- FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram for explaining a configuration of a narrowband filter of the receiving apparatus of FIG.
- FIG. 5 is a diagram for explaining the effect of the receiving apparatus of FIG. 3.
- FIG. 6 is a block diagram showing a configuration of a receiving apparatus according to the second embodiment of the present invention.
- FIG. 7 is a block diagram showing another configuration of the receiving apparatus according to Embodiment 2 of the present invention.
- FIG. 8 is a flowchart for explaining the operation of the switching narrowband filter section of FIGS. 6 and 7.
- FIG. 9 is a block diagram showing a configuration of a receiving apparatus in Embodiment 3 of the present invention.
- FIG. 10 is a flowchart for explaining the operation of the variable narrowband filter section of FIG.
- the electric field strength of the received radio wave is used.
- one of the purposes is to realize the reception control that accurately reflects the condition of the radio wave of the desired station (specifically, the change in electric field strength).
- Such a receiving apparatus and receiving method may be applied to FM broadcast reception or AM broadcast reception.
- the intermediate frequency component of the received broadcast radio wave is selectively acquired by the intermediate frequency acquisition unit 201. Then, the acquired intermediate frequency component is output to reception control section 202. At this time, part of the output intermediate frequency component is output to the desired station radio wave acquisition unit 203.
- the intermediate frequency component acquired by the intermediate frequency acquisition unit 201 includes a desired station radio wave and an adjacent jamming radio wave.
- the desired station radio wave acquisition unit 203 separates the desired station radio wave and the adjacent interfering radio wave for the input intermediate frequency component, and selectively acquires the desired station radio wave.
- the desired station radio wave acquired by the desired station radio wave acquisition unit 203 is further output to the detection unit 204, where the electric field strength of the desired station radio wave is detected. Then, the detection result is output to the reception control unit 202.
- the reception control unit 202 controls the reception state of the intermediate frequency component output and input from the intermediate frequency acquisition unit 201 based on the detection result output from the detection unit 204.
- the reception control unit 202 detects the electric field of the adjacent interfering radio wave. It is possible to perform control that more accurately reflects the electric field strength of the desired radio wave by removing the influence of the strength.
- the output from the reception control unit 202 is further input to a subsequent processing means not shown here.
- FIG. 3 is a block diagram showing a configuration of the receiving apparatus according to Embodiment 1 of the present invention.
- Each of these component elements 301 to 310 is connected by a transmission line 311 formed of a coaxial cable or the like. Specifically, they are connected in series in this order via an antenna 301, a high frequency amplifier 302, a mixer 303, and an intermediate frequency filter 304 force transmission path 311.
- the output side of the intermediate frequency filter 304 and the input side of the ARC unit 309 are provided with two transmission paths 311 formed in parallel, that is, an intermediate frequency amplification unit 305 and an audio demodulation unit 307.
- the transmission path 311 is connected to the narrowband filter 306 and the detection unit 308 by a transmission path 311 arranged on the way.
- the output side of the ARC unit 309 is further connected to the input side of the decoder 310 via the transmission path 311.
- the intermediate frequency filter 304 corresponds to the intermediate frequency acquisition unit
- the narrowband filter 306 corresponds to the desired station radio wave acquisition unit
- the detection unit 308 corresponds to the detection unit
- the ARC unit Reference numeral 309 corresponds to reception control means.
- FM radio waves or AM radio waves received by the antenna 301 are amplified at high frequency by the high frequency amplifying unit 302.
- the output from the high frequency amplifier 302 is output to the intermediate frequency filter 304 via the mixer 303.
- the intermediate frequency filter 304 the intermediate frequency component of the received broadcast radio wave passes through the filter 304 in accordance with the filter characteristics, specifically, the pass frequency band.
- the intermediate frequency component that has passed through the intermediate frequency filter 304 is output to the intermediate frequency amplification unit 305 and the narrowband filter 306, respectively.
- the intermediate frequency amplification unit 305 amplifies the input intermediate frequency component, and further outputs to the audio demodulation unit 307 for processing.
- the output from the voice demodulator 307 It is input to 309.
- the narrow band filter 306 a predetermined frequency component of the inputted intermediate frequency components passes through the filter 306 in accordance with the filter characteristics, specifically, the pass frequency band. That is, the narrowband filter 306 selectively passes the desired station radio wave out of the input intermediate frequency components and separates the adjacent jamming radio wave from the desired station radio wave.
- the narrow band filter 306 is set so that the pass frequency band is narrower than the pass frequency band of the intermediate frequency filter 304. Specifically, in the intermediate frequency filter 304, the pass frequency band is set to a band including the desired station radio wave and the adjacent interfering radio wave, whereas in the narrow band filter 306, the pass frequency band is set to the desired station radio wave. It is set to a band that includes and does not include adjacent interference.
- FIG. 4 is a diagram for explaining the configuration of the narrowband filter 306 of the receiving apparatus according to the first embodiment. Specifically, the filter characteristics of the narrow band filter 306 and the filter characteristics of the intermediate frequency filter 304 are shown.
- the pass frequency band W1 is set to a frequency band that includes the desired station radio wave 401 and does not include the adjacent interfering radio wave 402.
- the narrow band filter 306 has a narrower pass frequency band W1 than the pass frequency band W2 of the intermediate frequency filter 304 normally used in the receiver, and the desired station radio wave is in the overlapping band of both filters 306 and 304.
- the pass frequency band is set so that 401 is included and the adjacent interfering radio wave 402 is included in the non-overlapping region.
- the pass frequency band W2 of the intermediate frequency filter 304 has a width of about 500 kHz with the frequency band of the desired station radio wave 401 as the center frequency.
- the passing frequency band W1 of the narrowband filter 306 is centered on the frequency band of the desired station radio wave 401. It is set to have a width of about 200 kHz.
- the desired station radio wave 401 that has passed through the narrow band filter 306 is further output to the detection unit 308.
- the detection unit 308 includes, for example, a signal meter, and detects the electric field strength of the input desired station radio wave 401.
- the detection result is output to the ARC unit 309.
- ARC Unit 309 controls the reception state by setting an appropriate control amount corresponding to the detected electric field intensity of desired station radio wave 401. For example, in the case of FM broadcast, separation control, high cut control and mute control are performed in the ARC unit 309, and in the case of AM broadcast, high cut control and mute control are performed.
- the operation of the ARC unit 309 will be described in detail.
- the ARC unit 309 is based on the electric field strength of the desired station radio wave 401 input from the detection unit 308! In other words, the reception strength is controlled so that the noise is minimized under the radio wave conditions. That is, the ARC unit 309 adjusts the control amount in each of the separation control, the high cut control, and the mute control based on the electric field strength of the desired station radio wave 401 and performs appropriate control to reduce noise. . In this case, the ARC unit 309 increases the control amount as the electric field strength of the desired station radio wave 401 is reduced, and promotes control.
- the electric field strength used as a criterion for determining the control amount in the ARC unit 309 is different from the conventional case in which the electric field strengths of both components of the desired station radio wave and the adjacent interfering radio wave are used. Is the electric field strength of only the desired station radio wave that has passed through. Therefore, the control operation of the ARC unit 309 executed based on the electric field strength can accurately reflect the change in the electric field strength of the desired station radio wave, and is appropriate for the change in the radio wave condition of the desired station radio wave. It is possible to realize reception control corresponding to.
- the output from the ARC unit 309 is further input to the decoder 310 and then output as audio.
- FIG. 5 is a diagram for explaining the effect of the receiving apparatus according to the first embodiment.
- the solid line graph force shows the high cut control in the ARC unit 309 (see FIG. 3) of the receiver of the first embodiment, and the broken line graph force ARC unit 108 of the conventional receiver (see FIG. 3).
- the horizontal axis indicates the frequency
- the vertical axis indicates the output level.
- the ARC units 309 and 108 do not perform high-cut control if the electric field strength of the desired station radio wave is strong. Increases (see arrow A in the figure). On the other hand, when the electric field strength of the desired station radio wave decreases, the high-cut control is promoted along with the decrease, so the output level of the high frequency component decreases. [0039] As shown by the broken line graph, in the conventional receiver, as the electric field strength of the desired station radio wave decreases, the output level of the high frequency component of the radio wave from the arrow A in FIG. As shown by arrow B2, arrow C2, and arrow D2, the values are reduced in order.
- the electric field strength used for setting the control amount in the high cut control is affected by the adjacent interfering radio wave other than the desired station radio wave.
- the high-cut control The amount of control in other words, the attenuation of the high frequency component is reduced, and the output level of the high frequency component is increased.
- the ARC unit 309 performs high-cut control corresponding to only the electric field strength of the desired station radio wave without being affected by the electric field strength of the adjacent interfering radio wave. Is possible. Therefore, it is possible to accurately reflect the change in the electrolysis intensity of the desired station radio wave and realize no-cut control appropriately corresponding to the change.
- the ARC unit 309 performs reception control based only on the electric field strength of the desired station radio wave without being affected by the electric field strength of the adjacent interfering radio wave. It is possible to accurately and appropriately reflect the change in the electric field strength of the desired station radio wave 401 and realize reception control appropriately corresponding to the change in the radio wave state of the radio wave 401. Therefore, in such a receiving apparatus, noise can be reduced more than in the conventional receiving apparatus, and it is possible to realize a good audibility.
- the pass frequency band W1 of the narrowband filter 306 is not limited to the above setting, but is relatively determined by the distance W3 between the desired radio wave 401 and the adjacent jamming radio wave 402. As appropriate. Any setting other than the above may be used as long as it can selectively pass only the desired radio wave 401 and remove the adjacent disturbing radio wave 402. Further, if the distance W3 between the desired station radio wave 401 and the adjacent interfering radio wave 402 changes, it is appropriately set accordingly.
- FIG. 6 is a block diagram showing a configuration example of a receiving apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a block diagram showing another configuration example of the receiving apparatus according to Embodiment 2 of the present invention. 6 and 7, the same components as those in FIG. 3 are denoted by the same reference numerals. In the following, description of the same components as in FIG. 3 will be omitted, and the characteristic configuration of the second embodiment will be described.
- the receiving device of the second embodiment has the same configuration as the receiving device of the first embodiment shown in FIG. 3, but the following points are different from those of the first embodiment. ing. That is, the receiving apparatus of the second embodiment includes a switching narrowband filter unit 600 including a plurality of narrowband filters having different pass frequency bands, that is, a first narrowband filter 306a and a second narrowband filter 306b.
- the output from the mixer 303 is input to the switching narrow band filter unit 600 and the output from the switching narrow band filter unit 600 is input to the detection unit 308.
- the configuration in which the output from the mixer 303 is input to the switching narrowband filter unit 600 is illustrated here, but in addition to this, the output from the intermediate frequency filter 304 is input to the switching narrowband filter unit 600.
- An input configuration may be used.
- the switching narrowband filter unit 600 includes an adjacent jamming wave detection unit 601, a first narrowband filter 306a, and a second narrowband filter 306b that are arranged in parallel so that the outputs from the mixer 303 can be input respectively.
- a filter switching control unit 602 including a switching circuit 603 is provided.
- the filter switching control unit 602 is configured to be able to input the output from the adjacent jamming wave detection unit 601 and to be able to input the outputs from the first and second narrowband filters 306a and 306b.
- the filter switching control unit 602 is configured to be able to input the output of one of the first and second narrowband filters 306a and 306b selected as described later to the detection unit 308.
- Adjacent jamming wave detection unit 601 detects how far the adjacent jamming radio wave is in the frequency band of the desired station, that is, the distance between both radio waves indicated by arrow W3 in FIG. In addition to this, the adjacent jamming wave detection unit 601 simply detects the presence or absence of neighboring jamming radio waves, for example. The structure to take out may be sufficient.
- the first and second narrowband filters 306a and 306b have substantially the same center frequency, but have different pass frequency bands.
- the first narrowband filter 306a has a wider pass frequency band than the second narrowband filter 306b.
- the relationship between the first and second narrowband filters 306a and 306b and the intermediate frequency filter 304 is the same as the relationship between the narrowband filter 306 and the intermediate frequency filter 304 of the first embodiment.
- the first and second narrowband filters 306a and 306b are arranged connected in parallel.
- the first and second narrowband filters 306a and 306b are arranged in series.
- the characteristics of the first narrowband filter 306a arranged in the previous stage and the characteristics of the second narrowband filter 306b arranged in the subsequent stage are combined. Therefore, the configuration of a narrower band filter is facilitated.
- the filter switching control unit 602 controls the switching operation of the switching circuit 603 based on the output from the adjacent jamming wave detection unit 601. Then, the switching operation of the switching circuit 603 selectively switches which output of the first and second narrowband filters 306a and 306b is output to the detection unit 308.
- FIG. 8 is a flowchart for explaining the operation of the switching narrow band filter unit 600 of FIGS. 6 and 7.
- the output from the mixer 30 3 is output from the adjacent jamming wave detection unit 601 (FIG. 6). And FIG. 7) and the first and second narrowband filters 306a and 306b (see FIG. 6 and FIG. 7), respectively.
- the adjacent interfering radio wave detection unit 601 detects the distance between the adjacent interfering radio wave and the desired station radio wave based on strong input. Then, the detection result is input to the filter switching control unit 602 (see FIGS. 6 and 7) (step S701).
- each of the first and second narrowband filters 306a and 306b processes (filters) the output from the input mixer 303 in accordance with the pass frequency band. ).
- the components included in the pass frequency band selectively pass through the filters 306a and 306b in each of the first and second narrowband filters 306a and 306b (both see FIG. 6 and FIG. 7) to be output.
- Signals are input to the filter switching control unit 602 (see FIG. 6 and FIG. 7), respectively (steps S702 and S703).
- the filter switching control unit 602 uses the detection result output from the adjacent jamming wave detection unit 601 (see FIGS. 6 and 7) to generate the first narrowband filter 306a (see FIG. 6). 6 (see FIG. 7 and FIG. 7), it is determined whether or not the force includes the adjacent interfering radio wave in the passing frequency band (step S704).
- step S704 If the adjacent interference wave is not included in the pass frequency band of the first narrowband filter 306a (see Fig. 6 and Fig. 7) (step S704: No), the first narrowband filter 306a (Fig. 6).
- the filter switching control unit 602 controls the switching circuit 603 so as to form a signal path for inputting an output signal from the detection unit 308 (see FIGS. 6 and 7), and the signal path Is formed (step S706).
- step S704 when adjacent jamming waves are included in the pass frequency band of the first narrowband filter 306a (see FIGS. 6 and 7) (step S704: Yes), the second narrowband filter 306b (see FIG. 6).
- the filter switching control unit 602 controls the switching circuit 603 to form the signal path so that the signal path for inputting the output signal from the detection unit 308 (see FIGS. 6 and 7) is formed. (Step S705).
- the first and second narrowband filters 306a and 306b of the switching narrowband filter unit 600 separate the adjacent jamming radio wave and the desired station radio wave, and The radio wave can be selectively passed and output to the detection unit 308. Therefore, the same effects as those described above can be obtained in the receiving apparatus of the first embodiment.
- the first and second radio waves are reflected in consideration of the relative relationship between the desired station radio wave and the adjacent interfering radio wave (specifically, the distance between both radio waves).
- the second narrowband filters 306a and 306b one filter that is optimal for selective passage of the desired station radio wave is appropriately selected and used.
- the receiving device of the second embodiment compared to the receiving device of the first embodiment using the narrow band filter 306 (see Fig. 3) having a fixed pass frequency band, the electric field strength of the desired station radio wave is reduced. It becomes possible to detect more accurately. As a result, the ARC unit 309 realizes better reception control. Such an effect is based on the following background.
- the input power to the detection unit 308 have a frequency bandwidth that is approximately the same as the pass frequency bandwidth of the intermediate frequency filter 304. Therefore, it is preferable that the switching narrow band filter unit 600 widens the pass frequency band as much as possible within the range not including the adjacent interfering radio waves.
- the electric field of the desired station radio wave detected by the detector 308 is used.
- the strength is lower than the original electric field strength by the amount of energy removed by the processing by the first or second narrowband filters 306a and 306b. If the electric field strength decreases in this manner, it is difficult to accurately detect the electric field strength of the desired station radio wave, which is not preferable.
- the adjacent interference among the first and second narrowband filters 306a and 306b is appropriately handled in accordance with the relative relationship between the adjacent interference radio wave and the desired station radio wave. Since it is possible to realize an optimal filter configuration with a wide pass frequency band as much as possible in a range that does not include radio waves, it is possible to output a desired station radio wave having an electric field strength close to the original electric field strength to the detection unit 308. It becomes possible. Therefore, the receiving apparatus of the second embodiment can accurately detect the electric field strength of the desired station radio wave. As a result, the ARC unit 309 can more appropriately perform reception control corresponding to a change in the radio wave state of the desired station radio wave.
- FIG. 9 is a block diagram of the configuration of the receiving apparatus according to the third embodiment of the present invention.
- FIG. 9 the same components as those in FIG. In the following, Figure 3 The description of the same components as those in FIG.
- the receiving apparatus of the third embodiment has the same configuration as the receiving apparatus of the first embodiment shown in FIG. 3, but the following points are different from the receiving apparatus of the first embodiment. ing. That is, the receiving apparatus of the third embodiment includes a variable narrowband filter unit 800 including a variable narrowband filter 803 that can change the pass frequency band. The output from the mixer 303 is input to the variable narrow band filter unit 800, and the output from the variable narrow band filter unit 800 is input to the detection unit 308.
- variable narrowband filter unit 800 the configuration in which the output from the mixer 303 is input to the variable narrowband filter unit 800 is illustrated, but in addition, the output from the intermediate frequency filter 304 is input to the variable narrowband filter unit 800.
- An input configuration may be used.
- the variable narrowband filter unit 800 includes an adjacent jamming wave detection unit 801 and a variable narrowband filter 803 that are arranged in parallel so that the outputs from the mixer 303 can be input to each other.
- a variable narrowband filter control unit 8002 to which the output from 801 is input is provided.
- the output from the variable narrow band filter control unit 802 is input to the variable narrow band filter 803.
- the output from the variable narrow band filter 803 is input to the detection unit 308.
- the adjacent interfering radio wave detection unit 801 has the same configuration as the adjacent interfering radio wave detection unit 601 (see Fig. 6) of the second embodiment, and the distance between the adjacent interfering radio wave and the desired station radio wave is determined.
- the variable narrowband filter 803 is a filter configured to be able to change the pass frequency band while keeping the center frequency constant.
- the variable narrow band filter 803 has a plurality of filter configurations having the same center frequency and different pass frequency bands. It has a configuration that can be realized with one filter.
- FIG. 10 is a flow chart for explaining the operation of the variable narrowband filter unit 800 (see FIG. 8). It should be noted that the description of the force variable narrowband filter unit 800 other than the description is omitted here. The operations of the components 301 to 305 and 307 to 310 of the receiving apparatus are the same as those described in the first embodiment.
- the output from the mixer 303 is the adjacent jamming wave detector 801 (see FIG. 9) and the variable narrowband filter unit 800 (see FIG. 9).
- Each is input to filter 80 3 (see Fig. 9).
- the adjacent interfering radio wave detection unit 801 detects the distance between the adjacent interfering radio wave and the desired station radio wave based on the input. Then, the detection result is input to the variable narrowband filter control unit 802 (see FIG. 9) (Step S 90 Do)
- variable narrowband filter control unit 802 (see FIG. 9) is based on the detection result of the adjacent adjacent radio wave detection unit 801 (see FIG. 9)!
- the optimum pass frequency band is determined (see Fig. 9) (step S902).
- the optimum pass frequency band is, for example, the one having the maximum bandwidth among the pass frequency bands whose center frequency is located in the vicinity of the desired station radio wave and does not include the adjacent interfering radio wave.
- variable narrowband filter control unit 802 controls the variable narrowband filter 803 (see FIG. 9) based on the acquired optimum pass frequency band, and the variable narrowband filter.
- the pass frequency band of the data 803 is adjusted to the band (step S903).
- variable narrowband filter 803 (see Fig. 9) Adjustment is made to widen the passband.
- variable narrow band filter 803 (see FIG. 9) is adjusted so that the pass frequency band becomes narrow.
- the variable narrow band filter 803 (see FIG. 9) whose pass frequency band is adjusted in this way processes (filters) the output from the mixer 303 (see FIG. 9) according to the pass frequency band. (Step S904). As a result, the desired station radio wave selectively passes through the variable narrowband filter 803 (see FIG. 9) and is output to the detection unit 308 (see FIG. 9).
- variable narrowband filter unit 800 separates the adjacent interfering radio wave from the desired station radio wave, and selectively passes the desired station radio wave to detect the wave detector 30. 8 can be output. Therefore, the effect described above in the receiving apparatus of the first embodiment. The same effect as the fruit is obtained.
- variable narrowband filter is appropriately reflected in consideration of the relative relationship between the desired station radio wave and the adjacent interfering radio wave (specifically, the distance between both radio waves). It is possible to optimally adjust the pass frequency band of 803 as appropriate. Therefore, the same effects as those described in Example 2 can be obtained.
- the above first to third embodiments are examples of the receiving apparatus according to the present invention, and the receiving apparatus according to the present invention is not limited to this.
- the case where the electric field strength of the desired station radio wave obtained by the characteristic configuration of the present invention is used for the reception control performed by the ARC unit 309 has been described.
- the electric field strength of the desired station wave may be applied to the BSM function.
- the receiving device and the receiving method according to the present invention as described above can be used for various purposes.
- the receiving device and the receiving method according to the present invention can be used for a mobile receiving device for in-vehicle use or the like in which the state of the broadcast radio wave varies significantly due to movement. When applied, an effective effect is obtained.
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JP2006547862A JP4213186B2 (ja) | 2004-11-30 | 2005-11-25 | 受信装置および受信方法 |
EP05809715A EP1819060A4 (en) | 2004-11-30 | 2005-11-25 | RECEIVING DEVICE AND RECEIVING METHOD |
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JP2004-346609 | 2004-11-30 | ||
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US9781675B2 (en) | 2015-12-03 | 2017-10-03 | Qualcomm Incorporated | Detecting narrow band signals in wide-band interference |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05327537A (ja) * | 1992-05-26 | 1993-12-10 | Alpine Electron Inc | Fmラジオ受信機 |
JPH0653849A (ja) * | 1991-06-29 | 1994-02-25 | Hitachi Ltd | ラジオ受信装置 |
JP2005079870A (ja) * | 2003-08-29 | 2005-03-24 | Sanyo Electric Co Ltd | Am受信回路 |
Family Cites Families (3)
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US3953802A (en) * | 1974-06-06 | 1976-04-27 | Edmac Associates Inc. | Adjacent channel rejector |
JPH0232248U (ja) * | 1988-08-24 | 1990-02-28 | ||
DE4319457C2 (de) * | 1993-06-11 | 1997-09-04 | Blaupunkt Werke Gmbh | Schaltungsanordnung zur Nachbarkanalerkennung und -unterdrückung in einem FM-Rundfunkempfänger |
-
2005
- 2005-11-25 JP JP2006547862A patent/JP4213186B2/ja not_active Expired - Fee Related
- 2005-11-25 WO PCT/JP2005/021702 patent/WO2006059550A1/ja active Application Filing
- 2005-11-25 EP EP05809715A patent/EP1819060A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0653849A (ja) * | 1991-06-29 | 1994-02-25 | Hitachi Ltd | ラジオ受信装置 |
JPH05327537A (ja) * | 1992-05-26 | 1993-12-10 | Alpine Electron Inc | Fmラジオ受信機 |
JP2005079870A (ja) * | 2003-08-29 | 2005-03-24 | Sanyo Electric Co Ltd | Am受信回路 |
Non-Patent Citations (1)
Title |
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See also references of EP1819060A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1819060A4 (en) | 2011-11-23 |
JPWO2006059550A1 (ja) | 2008-06-05 |
JP4213186B2 (ja) | 2009-01-21 |
EP1819060A1 (en) | 2007-08-15 |
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