EP2637326A2 - RDS-TMC-Empfänger und entsprechendes Verfahren - Google Patents

RDS-TMC-Empfänger und entsprechendes Verfahren Download PDF

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Publication number
EP2637326A2
EP2637326A2 EP13157201.8A EP13157201A EP2637326A2 EP 2637326 A2 EP2637326 A2 EP 2637326A2 EP 13157201 A EP13157201 A EP 13157201A EP 2637326 A2 EP2637326 A2 EP 2637326A2
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EP
European Patent Office
Prior art keywords
deviation
data
determination condition
specific item
transmission standards
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13157201.8A
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English (en)
French (fr)
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EP2637326A3 (de
EP2637326B1 (de
Inventor
Shuji Taki
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Alpine Electronics Inc
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Alpine Electronics Inc
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Filing date
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Publication of EP2637326A2 publication Critical patent/EP2637326A2/de
Publication of EP2637326A3 publication Critical patent/EP2637326A3/de
Application granted granted Critical
Publication of EP2637326B1 publication Critical patent/EP2637326B1/de
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Anticipated expiration legal-status Critical

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/55Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for traffic information
    • GPHYSICS
    • G08SIGNALLING
    • G08GTRAFFIC CONTROL SYSTEMS
    • G08G1/00Traffic control systems for road vehicles
    • G08G1/09Arrangements for giving variable traffic instructions
    • G08G1/091Traffic information broadcasting
    • G08G1/092Coding or decoding of the information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86Arrangements characterised by the broadcast information itself
    • H04H20/95Arrangements characterised by the broadcast information itself characterised by a specific format, e.g. an encoded audio stream
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H2201/00Aspects of broadcast communication
    • H04H2201/10Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H2201/00Aspects of broadcast communication
    • H04H2201/60Aspects of broadcast communication characterised in that the receiver comprises more than one tuner

Definitions

  • the present invention relates to a receiving apparatus mounted on a mobile body, such as a vehicle, and more particularly, to a radio receiver which is capable of receiving a broadcast signal into which data is multiplexed.
  • RDS radio data system
  • PI program identification
  • PTY program type
  • TMC traffic message channel
  • a broadcast program name is displayed on a display, or a list of alternative broadcast stations is created, and when a vehicle is moved out of a reception area, automatic switching or retuning to an alternative broadcast station is implemented (see JP 2990187 B1 and JP 3271869 B2 ).
  • An RDS receiver which can speedily receive traffic information provided by RDS broadcasts is also disclosed (see JP 4578413 B2 ).
  • Broadcast stations which transmit RDS broadcasts transmit various items of data to be multiplexed into broadcast signals in accordance with transmission standards, and radio receivers receive such items of data in accordance with the transmission standards.
  • some broadcast stations transmit data without complying with the transmission standards.
  • a radio receiver receives an RDS broadcast including such data, it is wrongly determined that data has not been correctly received, on the basis of determination conditions which comply with the transmission standards. In such a case, it is necessary to take time to analyze a data fault and to further check whether the received data can be handled as normal data. If it takes too much time to receive and check traffic information, it is not possible for a navigation device to provide traffic information at appropriate times. If it takes too much time to perform reception processing for traffic information, the time to process other items of data multiplexed into the same broadcast signal as the traffic information is reduced, thereby failing to perform processing appropriately.
  • a receiving apparatus is capable of receiving a broadcast signal into which data is multiplexed.
  • the receiving apparatus includes: receiving means for receiving the broadcast signal; identifying means for identifying data included in the broadcast signal received by the receiving means; extracting means for extracting a specific item of data from the identified data; determining means for determining whether the specific item of data has been correctly received, on the basis of a determination condition corresponding to transmission standards of the specific item of data; storage means for storing therein a first deviation table in which relationships between contents of deviation from the transmission standards and associated deviation determination conditions are defined; searching means for searching for a deviation determination condition from the first deviation table; and changing means for changing the determination condition corresponding to the transmission standards of the specific item of data to the deviation determination condition searched by the searching means.
  • the determining means is able to determine on the basis of the deviation determination condition whether the specific item of data has been correctly received.
  • the receiving apparatus may further include: extracting means for extracting broadcast station identification information for identifying a broadcast station which has transmitted the broadcast signal received by the receiving means; and storage means for storing therein a second deviation table in which relationships between contents of deviation when broadcast stations have transmitted the specific item of data by deviating from the transmission standards and associated items of broadcast station identification information are defined.
  • the searching means may search for a content of deviation corresponding to the extracted broadcast station identification information by referring to the second deviation table, and may also search for a deviation determination condition corresponding to the searched content of deviation by referring to the first deviation table.
  • the searching means may search for a deviation determination condition.
  • the receiving apparatus may further include updating means for updating the contents of the second deviation table.
  • the updating means may register the content of deviation searched from the first deviation table in the second deviation table.
  • the updating means may change the content of deviation stored in the second deviation table to another content of deviation.
  • the determining means may determine whether the specific item of data has been correctly received on the basis of the determination condition corresponding to the transmission standards.
  • the receiving apparatus may further include output means for outputting the specific item of data when the determining means determines that the specific item of data has been correctly received.
  • the receiving apparatus may further include: control means for controlling the receiving means; audio output means; and signal processing means.
  • the receiving means may include first and second tuners.
  • the control means may cause the signal processing means to extract an audio signal from a signal received by the first tuner and may cause the audio output means to output the audio signal.
  • the control means may cause the signal processing means to extract items of data from a signal received by the second tuner and to execute processing on the items of data other than the specific item of data while the specific item of data is being extracted.
  • the receiving means may receive an radio data system (RDS) broadcast signal, and the specific item of data may be traffic message channel (TMC) data included in RDS data in the RDS broadcast signal.
  • RDS radio data system
  • TMC traffic message channel
  • a system includes: the receiving apparatus of the first aspect having none or at least one of the above-described preferred features; and a navigation device which is capable of communicating with the receiving apparatus.
  • the receiving apparatus may provide traffic information multiplexed into a broadcast signal to the navigation device.
  • a receiving method is used for a receiving apparatus which is capable of receiving a broadcast signal into which data is multiplexed.
  • the receiving method includes: a receiving step of receiving the broadcast signal; an identifying step of identifying data included in the received broadcast signal; a first extracting step of extracting a specific item of data from the identified data; a determining step of determining whether the specific item of data has been correctly received, on the basis of a determination condition corresponding to transmission standards of the specific item of data; a first searching step of searching for a deviation determination condition from a first deviation table in which relationships between contents of deviation from the transmission standards and associated deviation determination conditions are defined; a changing step of changing the determination condition corresponding to the transmission standards of the specific item of data to the searched deviation determination condition; and a re-determining step of re-determining whether the specific item of data has been correctly received, on the basis of the deviation determination condition.
  • the receiving method may further include: a second extracting step of extracting broadcast station identification information for identifying a broadcast station which has transmitted the received broadcast signal; a second searching step of searching for a content of deviation corresponding to the extracted broadcast station identification information by referring to a second deviation table in which relationships between contents of deviation when broadcast stations have transmitted the specific item of data by deviating from the transmission standards and associated items of broadcast station identification information are defined; and a third searching step of searching for a deviation determination condition corresponding to the searched content of deviation by referring to the first deviation table.
  • the first searching step searches for a deviation determination condition.
  • the method may further include: an updating step of updating the contents of the second deviation table, wherein the updating step registers the content of deviation searched from the first deviation table in the second deviation table.
  • the updating step changes the content of deviation stored in the second deviation table to another content of deviation.
  • the receiving method may include: an outputting step of outputting the specific item of data when the determining step or the re-determining step determines that the specific item of data has been correctly received.
  • the invention it is possible to search for the content of deviation by referring to the first deviation table, thereby making it possible to speedily check whether a specific item of data has been correctly received.
  • the second deviation table in which relationships between the contents of deviation and associated receiving broadcast stations are defined, it is possible to speedily search for the content of deviation.
  • a radio receiver mounted on a vehicle which is a mobile body
  • a radio receiver is capable of receiving radio broadcasts into which data is multiplexed, and an example of such radio broadcasts is an RDS broadcast.
  • Fig. 1A illustrates the configuration of a vehicle-mounted electronic system 10 of a first embodiment.
  • the vehicle-mounted electronic system 10 includes a radio receiver 20 and a navigation device 30 mounted on a vehicle.
  • the radio receiver 20 receives a radio broadcast selected by a user, and traffic information contained in data superposed on the radio broadcast is provided to the navigation device 30.
  • RDS broadcasting TMC services for providing traffic information by utilizing digital data (RDS data) which is superposed on an analog frequency-modulation (FM) broadcast signal are widely used.
  • RDS data digital data
  • FM analog frequency-modulation
  • the traffic information is sorted by countries, areas, and roads. For the sake of convenience, traffic information provided by TMC services is referred to as "TMC data".
  • TMC data obtained by the radio receiver 20 is provided to the navigation device 30.
  • the navigation device 30 decrypts the TMC data and displays traffic information on a road map or provides it as audio guidance.
  • the navigation device 30 supplies position information concerning the position of a vehicle on which the radio receiver 20 and the navigation device 30 are mounted, and/or a destination, to the radio receiver 20, and then, the radio receiver 20 transmits TMC data corresponding to the position information to the navigation device 30.
  • the radio receiver 20 can select TMC data corresponding to the position information by referring to a PI code or a country code of the RDS data.
  • the configuration of the vehicle-mounted electronic system 10 shown in Fig. 1A is only an example, and may include a television receiver, a player for digital versatile discs (DVDs) and/or Blu-ray discs, a multifunction terminal (smartphone), etc.
  • Fig. 1B is a block diagram illustrating the configuration of the radio receiver 20 of the first embodiment.
  • the radio receiver 20 includes first and second antennas 100A and 100B, first and second tuners 110A and 110B, a signal processor 120, an amplifier 130, a speaker 132, a display unit 140, a storage unit 150, an input unit 160, an interface (I/F) 170, and a controller 180.
  • the first and second tuners 110A and 110B receive broadcast signals from broadcast stations (frequencies) selected via the first and second antennas 100A and 100B, respectively.
  • the signal processor 120 receives broadcast signals from the first and second tuners 110A and 110B and performs required processing on the received broadcast signals.
  • the amplifier 130 amplifies an audio signal processed by the signal processor 120.
  • the speaker 132 outputs an audio signal amplified in the amplifier 130.
  • the display unit 140 displays, for example, data decoded by the signal processor 120.
  • the input unit 160 receives an input from a user.
  • the I/F 170 enables the radio receiver 20 to connect to an external device, such as the navigation device 30.
  • the controller 180 controls the first and second tuners 110A and 110B, the signal processor 120, the amplifier 130, etc.
  • the first tuner 110A includes, as is known, a radio frequency (RF) amplifier which receives an RF signal from the antenna 100A and amplifies the RF signal, a tuned circuit which selects a frequency signal of a station desired by a user from the amplified RF signal, a mixer which mixes a frequency signal output from a local oscillator with the RF signal to generate an intermediate frequency (IF) signal, and a signal strength (S) meter circuit which detects a direct current (DC) of the IF signal and extracts a reception field intensity signal (S meter signal).
  • RF radio frequency
  • the first tuner 110A also converts the IF signal and the S meter signal to digital signals by using an analog-to-digital converter (ADC), and outputs the digital signals to the signal processor 120 and the controller 180.
  • ADC analog-to-digital converter
  • the second tuner 110B is formed similarly to the first tuner 110A.
  • the first and second tuners 110A and 110B may select the same broadcast station or different broadcast stations in response to an instruction from the controller 180.
  • the signal processor 120 is constituted by, for example, a digital signal processor (DSP).
  • the signal processor 120 can perform signal processing, such as fast Fourier transform (FFT), digital filtering, signal synchronization, time/frequency deinterleaving, audio decoding, data decoding, and phase diversity.
  • FFT fast Fourier transform
  • the signal processing can be controlled by using software stored in a program memory within the signal processor 120.
  • the signal processor 120 includes a digital-to-analog converter (DAC).
  • the DAC extracts an audio signal from a digital signal received from the first tuner 110A, converts the audio signal into an analog signal, and outputs the analog audio signal to the amplifier 130.
  • the signal processor 120 also extracts RDS data from a signal received from the second tuner 110B and executes various processing operations on the RDS data. For example, the signal processor 120 extracts TMC data from the RDS data and sends it to the navigation device 130, and creates a list of alternative broadcast stations from information concerning alternative broadcast stations, which is being transmitted between items of TMC data.
  • the controller 180 is constituted by, for example, a microcontroller, and controls the individual elements of the radio receiver 20 by executing a program stored in a memory.
  • the controller 180 in order to obtain an audio signal of a radio broadcast by using the first tuner 110A, the controller 180 causes the signal processor 120 to extract an audio signal from a signal received by the first tuner 110A.
  • the controller 180 in order to obtain RDS data by using the second tuner 110B, the controller 180 causes the signal processor 120 to extract RDS data from a signal received by the second tuner 110B.
  • the controller 180 then extracts TMC data from the extracted RDS data and outputs the TMC data to the navigation device 30.
  • the controller 180 also extracts data concerning alternative broadcast stations of a broadcast station which is being received by the first tuner 110A, creates a list of alternative broadcast stations, and stores the list in the storage unit 150.
  • the list of alternative broadcast stations is utilized, for example, when the sensitivity of the S meter signal received from the first tuner 110A or the second tuner 110B is decreased.
  • Fig. 2 is a block diagram illustrating the functional configurations of the signal processor 120 and the controller 180, and more specifically, the functional configuration in which TMC data is received.
  • the signal processor 120 includes an RDS decoder 200, a data block identifying section 210, a TMC data extracting section 220, and a TMC data storage section 230.
  • the RDS decoder 200 decodes a digital signal received from the second tuner 110B.
  • the data block identifying section 210 identifies data blocks contained in an RDS data stream DS extracted by the RDS decoder 200.
  • the TMC data extracting section 220 extracts TMC data from a data block including the TMC data on the basis of identification results obtained by the data block identifying section 210.
  • the TMC data storage section 230 stores therein the extracted TMC data.
  • the TMC data extracting section 220 and the TMC data storage section 230 are controlled on the basis of a determination signal S indicating a determination result output from a reception determining section 250 of the controller 180.
  • the determination signal S indicates a logic state "1" when a determination is necessary.
  • the determination signal S indicates a logic state "0" when a determination is not necessary. "When a determination is necessary” is, for example, when TMC data is first received after a radio receiver is powered ON or when the channel of a broadcast station is changed. "When a determination is not necessary” is, for example, when the reception determining section 250 has already determined that data was correctly received.
  • the TMC data extracting section 220 extracts TMC data from RDS data and the TMC data storage section 230 outputs the extracted TMC data to a TMC data output section 260 of the controller 180.
  • the TMC data output section 260 then outputs the TMC data to the navigation device 30.
  • the TMC data extracting section 220 extracts TMC data, an amount of which is sufficient to determine the transmission standards of the TMC data. For example, the TMC data extracting section 220 does not have to extract all items of TMC data, but extracts identification information added to the header of the TMC data without extracting traffic information contained in the body of the TMC data.
  • the TMC data storage section 230 is constituted by, a first-in-first-out (FIFO) memory, and stores extracted items of TMC data for a certain period of time or for a certain amount and supplies the extracted items of TMC data to a TMC data comparing section 240 of the controller 180.
  • FIFO first-in-first-out
  • the controller 180 includes a determination condition search section 270.
  • the TMC data comparing section 240 receives extracted items of TMC data necessary for determining the transmission standards from the TMC data storage section 230, and then compares the extracted items of TMC data with each other.
  • the reception determining section 250 determines, on the basis of the comparison results of the TMC data comparing section 240, whether the TMC data has been received such that it satisfies determination conditions corresponding to the transmission standards.
  • the TMC data output section 260 outputs TMC data on the basis of the determination results of the reception determining section 250.
  • the determination condition search section 270 searches for a determination condition used when deviation from the transmission standards is determined by referring to a deviation processing table 280, and supplies the searched determination condition to the reception determining section 250.
  • the functional configurations of the signal processor 120 and the controller 180 shown in Fig. 2 are only an example, and only one of the signal processor 120 and the controller 180 may be configured, as shown in Fig. 2 .
  • TMC data contained in RDS data superposed on an RDS broadcast is transmitted in accordance with transmission standards. That is, a broadcast station, which is a transmission side, transmits TMC data in compliance with transmission standards, and the radio receiver 20, which is a reception side, is designed to determine whether the received TMC data has been correctly received, on the basis of determination conditions set for the transmission standards. Accordingly, in the first embodiment, if the reception of the TMC data does not satisfy the determination conditions, the radio receiver 20 assumes that the broadcast station has transmitted the TMC data without complying with the transmission standards (in other words, by deviating from the transmission standards), and determines whether the TMC data has been correctly received by using a determination condition corresponding to the content of deviation.
  • Figs. 3A and 3B illustrate an example of transmission standards of TMC data.
  • Fig. 3A illustrates transmission standards of GAP3.
  • An RDS data stream DS extracted by the RDS decoder 200 is a set of continuous multiple data groups or data blocks.
  • data groups having identification (ID) information called 8A are periodically contained.
  • These 8A groups (hereinafter sometimes simply referred to as "8A") include TMC data.
  • 8A including the same TMC data is transmitted three times, and three data groups are disposed between two 8A groups.
  • the first three 8A groups include identical traffic information
  • the next three 8A groups include identical traffic information which is different from the previous traffic information.
  • Three 8A groups having the same TMC data are included in the RDS data stream DS intermittently at regular intervals.
  • the transmission standards are GAP5, 8A having the same TMC data is transmitted three times, but unlike GAP3, five data groups are disposed between two 8A groups.
  • eight data groups are disposed between two 8A groups, and in the case of GAP11, eleven data groups are disposed between two 8A groups.
  • the radio receiver 20 of the first embodiment has the following determination conditions. If the first two sequentially received 8A groups have the same data, the radio receiver 20 determines that TMC data has been correctly received, and discards the third 8A group.
  • the RDS decoder 200 of the signal processor 120 extracts the RDS data stream DS shown in Fig. 3A , and the data block identifying section 210 decodes header information of a data block contained in the RDS data stream DS, thereby identifying the individual data blocks.
  • the TMC data extracting section 220 extracts data blocks of 8A from the identified data blocks, and the TMC data storage section 230 sequentially stores TMC data items of 8A.
  • the determination condition search section 270 can identify the transmission standards (e.g., GAP3 or GAP5) of TMC data from information concerning the 8A data groups identified by the data block identifying section 210, and supplies determination conditions associated with the transmission standards to the reception determining section 250.
  • the reception determining section 250 may directly receive determination conditions associated with the transmission standards from the data block identifying section 210 without causing the determination condition search section 270 to search for the determination conditions.
  • the TMC data comparing section 240 compares items of TMC data sequentially stored in the TMC data storage section 230 and informs the reception determining section 250 of the number of 8A groups having the same data, the number of times that 8A groups have been extracted, etc.
  • the reception determining section 250 determines, in accordance with determination conditions corresponding to the transmission standards, whether 8A has been received three times and whether 8A having the same data has been received twice. If the determination conditions are satisfied, the reception determining section 250 determines that the TMC data has been correctly received, and outputs a determination signal S indicating the determination results to the TMC data extracting section 220, the TMC data storage section 230, and the TMC data output section 260.
  • the TMC data output section 260 outputs the TMC data to the navigation device 30 on the basis of the determination results indicating that TMC data has been correctly received.
  • the signal processor 120 and the controller 180 know the timing at which TMC data is received, from the transmission standards (e.g., GAP3 or GAP5). During a period for which TMC data is not received, other processing operations, such as the extraction of alternative broadcast stations from RDS data and the creation of a list of alternative broadcast stations, can be performed. In other words, in order to secure a sufficient time for performing other data processing operations, reception processing for TMC data has to be performed for a certain period of time. Additionally, if a broadcast station has transmitted TMC data by deviating from transmission standards, the determination condition search section 270 refers to the deviation processing table 280 and checks the reception of TMC data by using a determination condition corresponding to the content of deviation. This will be discussed later.
  • the transmission standards e.g., GAP3 or GAP5
  • Some RDS broadcast stations transmit TMC data by deviating from transmission standards. Particularly, RDS broadcast stations, which provide TMC services free of charge are likely to do so.
  • the reception determining section 250 determines that TMC data has not been correctly received since the determination conditions set for the transmission standards are not satisfied, and a known radio receiver executes a routine for analyzing a data communication fault. This fault analysis requires a certain time, and while the fault analysis is being conducted, a navigation device is unable to receive TMC data, thereby decreasing the speed in updating traffic information. The time taken to conduct a fault analysis depends on the type of GAP.
  • the time interval between two 8A groups is 1100 msec or longer, and it takes about thirty seconds at the maximum to determine that TMC data has been transmitted by deviating from transmission standards. If deviation from transmission standards has been detected, other processing operations which are supposed to be executed between two 8A groups are stopped for searching for the cause of the deviation.
  • the deviation processing table 280 is stored in the storage unit 150.
  • the relationships between the contents of deviation and associated processing operations which are to be performed i.e., determination conditions used when deviation from transmission standards has been detected
  • the deviation processing table 280 is stored in a rewritable non-volatile memory.
  • Fig. 4 illustrates an example of the deviation processing table 280.
  • the deviation processing table 280 defines relationships among the content of deviation from transmission standards, deviation codes indicating the coded deviation contents, and associated processing operations to be performed (including determination conditions when deviation from transmission standard has been detected). For example, if the radio receiver 20 has failed to extract TMC data (8A shown in Figs. 3A and 3B ) from RDS data received from an RDS broadcast station, the content of deviation is "no TMC data content", which is represented by deviation code "0". In this case, the controller 180 causes the second tuner 110B to receive a signal from a next candidate station.
  • the determination condition search section 270 shown in Fig. 2 searches for a determination condition corresponding to the content of deviation and informs the reception determining section 250 of this determination condition.
  • the deviation content indicates that a broadcast station has transmitted 8A twice, it means that the same TMC data has been transmitted twice and the remaining one item of TMC data is different from these previous items of TMC data, and the deviation code is represented by "2". If the deviation content indicates that a broadcast station has transmitted 8A four times or greater, the deviation code is represented by "3". In this case, it is determined that an abnormality has occurred during the transmission, and processing for switching to reception from another broadcast station is executed. If the deviation content indicates "preset GAP number deviated: 3", it means that the number of data groups between two 8A groups is three despite that the transmission standards are not GAP3 (e.g., the transmission standards are GAP5).
  • the deviation code is "13"
  • processing to be performed is "correct GAP number to 3 and receive data”. This is also applicable to a determination condition and is thus supplied to the reception determining section 250.
  • the signal processor 120 receives TMC data in accordance with the timing set for the GAP3 transmission standards, and allocates the other periods to other processing operations.
  • the deviation processing table 280 has been set in a memory, and has reflected the deviation contents of an RDS broadcast station when a vehicle was actually running. However, the deviation contents shown in Fig. 4 are only an example.
  • a TMC data receiving operation performed by the radio receiver 20 of the first embodiment will be described below with reference to the flowchart of Fig. 5 .
  • step S101 the vehicle-mounted electronic system 10 shown in Fig. 1A is started.
  • step S102 a destination is set in the navigation device 30.
  • the navigation device 30 supplies position information, such as the position of a vehicle in which the navigation device 30 is installed, a destination, a route position, and routing information, to the radio receiver 20. If a destination is not set, vehicle position information is supplied to the radio receiver 20.
  • step S103 the radio receiver 20 receives an RDS broadcast of a station selected by a user.
  • the signal processor 120 a digital signal received by the first tuner 110A is decoded.
  • a digital audio signal is extracted from the digital signal and is converted into an analog audio signal.
  • the analog audio signal is then output from the speaker 132.
  • the RDS decoder 200 decodes a digital signal output from the second tuner 110B so as to generate an RDS data stream DS.
  • the TMC data extracting section 220 extracts TMC data from the RDS data stream DS.
  • the transmission standards of TMC data superposed on the RDS broadcast are not yet determined, and thus, a signal S indicating that a determination is necessary is supplied from the reception determining section 250 to the TMC data extracting section 220, the TMC data storage section 230 and the TMC data output section 260. Items of TMC data extracted by the TMC data extracting section 220 are sequentially stored in the TMC data storage section 230, and the TMC data comparing section 240 checks the number of times that TMC data has been transmitted and the number of times that the same TMC data has been transmitted.
  • step S105 the reception determining section 250 receives comparison results from the TMC data comparing section 240 and makes a determination concerning reception of TMC data in accordance with determination conditions corresponding to the transmission standards of the TMC data.
  • step S106 the reception determining section 250 determines whether TMC data has been correctly received in accordance with the determination conditions. If the result of step S106 is YES, the process proceeds to step S107. If the result of step S106 is NO, the process proceeds to step S109.
  • the transmission standards are GAP3 in which a set of three items of TMC data is transmitted, the determination conditions are as follows.
  • the reception of the TMC data is determined to be correct, and the third TMC data is discarded. If the same TMC data has not been received twice, or if the number of data items defined by GAP does not coincide with the number of data items contained between two TMC data items, it is not determined that the reception of the TMC data is correct, but is determined that the transmission of the TMC data deviates from the transmission standards.
  • step S106 If it is determined in step S106 that TMC data has been correctly received, the process proceeds to step S107.
  • step S107 the TMC data output section 260 transmits the TMC data to the navigation device 30.
  • step S108 the navigation device 30 displays traffic information (e.g., a traffic jam or the closure of a road in the form of an icon or a message) on a road map screen on the basis of the received TMC data, or outputs traffic information as sound.
  • traffic information e.g., a traffic jam or the closure of a road in the form of an icon or a message
  • step S106 determines whether TMC data has been correctly received, i.e., that the transmission of the TMC data deviates from the transmission standards.
  • the determination condition search section 270 obtains the transmission standards (e.g., GAP3 or GAP5) identified by the data block identifying section 210, the state in which TMC data has been extracted, and the determination results obtained from the reception determining section 250.
  • the determination condition search section 270 then refers to these items of information and the deviation processing table 280 shown in Fig. 4 and determines the corresponding content of deviation.
  • the radio receiver 20 has failed to receive TMC data "8A" even once, it is determined that the content of deviation is "no TMC data content” and the associated deviation code is "0".
  • the content of deviation is "8A transmitted once” and the associated deviation code is "1". That is, in the case of GAP3, three data groups are disposed between two 8A groups, and the same TMC data "8A” has been transmitted only once during a period for which 8A is transmitted three times. If the same TMC data "8A" has been received only twice, it is determined that the content of deviation is "8A transmitted twice" and the associated deviation code is "2".
  • the same TMC data "8A” has been transmitted only twice during a period for which 8A is transmitted three times. If the same TMC data "8A” has been received four times or greater, it is determined that the content of deviation is "terminate: shift to reception from another candidate station” and the associated deviation code is "3". That is, the same TMC data has been continuously received four times or greater.
  • the other transmission standards such as GAP5, GAP8, and GAP11 are handled similarly to the case of GAP3. If the number of data groups disposed between two 8A groups is three despite that the transmission standards are other than GAP3, it is determined that the content of deviation "preset GAP number deviated: 3" and the associated deviation code is "13".
  • the content of deviation is "preset GAP number deviated: 5", “preset GAP number deviated: 8", or “preset GAP number deviated: 11", and the associated deviation code "14", "15”, or "16", respectively. If the content of deviation does not correspond to any one of the deviation codes "0" through “16”, it is determined that the content of deviation is "deviation other than the above” and the associated deviation code is "17".
  • the determination condition search section 270 searches for "processing to be performed” corresponding to the content of deviation by referring to the deviation processing table 280. This processing includes shifting to reception from another candidate station and changing of determination conditions. If "processing to be performed" concerns changing of determination conditions, in step S110, the determination condition search section 270 informs the reception determining section 250 of a new determination condition, and the reception determining section 250 changes the determination conditions set for the transmission standards to the informed determination condition used when deviation from the transmission standards has been detected. Then, in step S111, the controller 180 determines whether the content of deviation corresponds to shifting to reception from another candidate station, i.e., whether the content of deviation corresponds to the deviation code "0", "3", “6", “9", “12", or "17".
  • step S111 the process returns to step S106 to determine on the basis of the new determination condition whether subsequent TMC data has been correctly received. If the result of step S111 is YES, the process proceeds to step S112.
  • step S112 the controller 180 causes the second tuner 110B to select another RDS broadcast station. Then, TMC data is extracted from RDS data received from the broadcast station, and reception of TMC data is determined similarly to that described above.
  • the second tuner 110B seeks an RDS broadcast station having high reception sensitivity or selects an RDS broadcast station contained in a list of alternative broadcast stations.
  • the deviation processing table 280 is prepared, and if the reception of TMC data does not satisfy determination conditions corresponding to transmission standards, the content of deviation is determined by referring to the deviation processing table 280. Then, a determination condition corresponding to the content of deviation is searched for, and it is determined again by using the searched determination condition whether TMC data has been received correctly.
  • TMC data deviates from transmission standards, unlike the related art, it is not necessary to take time to analyze a communication fault, thereby making it possible to speedily extract TMC data.
  • data is first received from an RDS broadcast station, it is determined whether deviation from transmission standards has been detected. If deviation has been detected, a determination is made thereafter, on the basis of a determination condition corresponding to the content of deviation, whether TMC data has been correctly received, thereby accelerating and facilitating the extraction of TMC data. It is thus possible to speedily supply TMC data from the radio receiver 20 to the navigation device 30.
  • a radio receiver 20 of the second embodiment has a learning function in order to make a speedy determination whether transmission from an RDS broadcast station deviates from transmission standards.
  • the basic configuration of the radio receiver 20 is similar to that shown in Fig. 1B of the first embodiment.
  • Fig. 6 is a block diagram illustrating the functional configurations of the signal processor 120 and the controller 180, and the same elements as those of the first embodiment are designated by like reference numerals.
  • An RDS broadcast station transmits a PI code which is constituted by a country code and a broadcast station code. This PI code may be utilized, for example, when performing automatic tuning to a broadcast station broadcasting the same program as a program which is being received.
  • the signal processor 120 includes a PI code extracting section 300 which extracts a PI code from an RDS data stream DS. An extracted PI code is supplied to the determination condition search section 270.
  • the determination condition search section 270 refers to a deviation code table 310 on the basis of the PI code and checks whether the PI code of a broadcast station which is being received deviated from transmission standards in the past.
  • An example of the deviation code table 310 is shown in Fig. 7 .
  • the deviation code table 310 defines the relationships between PI codes and deviation codes, and may preferably be stored in a non-volatile memory of the storage unit 150.
  • the controller 180 also includes a deviation code table updating section 320 which makes addition, correction, and modification to the content of the deviation code table 310.
  • PI code/deviation code In the initial state of the deviation code table 310 before the shipment, known deviation data (PI code/deviation code) is registered. When deviation from transmission standards is newly found while a vehicle is running, it is registered in the deviation code table 310. Alternatively, in the initial state, no deviation data is stored in the deviation code table 310, and thereafter, every time an RDS broadcast station which is being received deviates from transmission standards, a corresponding PI code may be registered in the deviation code table 310 and may be updated.
  • step S201 a selected RDS broadcast is received.
  • step S202 a PI code is extracted.
  • step S203 the determination condition search section 270 refers to the deviation code table 310.
  • the determination condition search section 270 checks in step S204 whether the PI code is registered in the deviation code table 310. If it is determined in step S204 that the PI code is registered, the process proceeds to step S205.
  • step S205 the deviation code corresponding to the PI code is extracted.
  • step S206 the determination condition search section 270 searches for processing to be performed corresponding to the deviation code by referring to the deviation processing table 280.
  • step S207 the determination condition is changed in accordance with the processing to be performed.
  • step S208 the reception determining section 250 determines on the basis of the new determination condition whether TMC data has been correctly received. If the result of step S208 is YES, the process proceeds to step S209.
  • step S209 TMC data is transmitted to the navigation device 30.
  • step S210 the navigation device 30 performs processing on the basis of the TMC data and displays traffic information on a road map.
  • step S211 the reception determining section 250 makes a determination by using determination conditions associated with transmission standards. Then, in step S212, the reception determining section 250 determines whether TMC data has been correctly received. If the result of step S212 is YES, the process proceeds to step S209. If the result of step S212 is NO, the process proceeds to step S213. In step S213, in a manner similar to the first embodiment, the determination condition search section 270 searches for the content of deviation by referring to the deviation processing table 280.
  • step S214 the determination condition is changed in accordance with the processing to be performed associated with the content of deviation.
  • step S215 the reception determining section 250 determines again whether TMC data has been correctly received. If the result of step S215 is YES, the process proceeds to step S216.
  • step S216 the PI code and the deviation code are newly registered in the deviation code table 310. Then, steps S209 and S210 are executed. If the result of step S215 is NO, the process returns to step S213.
  • the second embodiment by utilizing learning effects by using the deviation code table 310, it is possible to make a more speedy determination concerning the reception of TMC data in accordance with the content of deviation than the first embodiment.
  • Fig. 9 illustrates an example of learning effects of the second embodiment.
  • the navigation device 30 requires traffic information concerning the traffic between city A and city B.
  • TMC data "8A" of city A, TMC data "8A" of city B, and TMC data "8A” of other cities are transmitted sequentially.
  • the navigation device 30 may supply position information concerning the positions of city A and city B to the radio receiver 20, and the radio receiver 20 may filter the TMC data and transmit items of TMC data concerning city A and city B to the navigation device 30.
  • the navigation device 30 may filter TMC data received from the radio receiver 20 and extract items of TMC data concerning city A and city B.
  • city A, city B, and route R are positioned within a reception area of a broadcast station X and that the broadcast station X transmits TMC data by deviating from transmission standards.
  • PI code (A221) of the broadcast station X or the associated deviation code is not registered in the deviation code table 310.
  • the reception determining section 250 determines the content of deviation of the broadcast station X from the reception mode of TMC data by referring to the deviation processing table 280. Then, the PI code (A221) and the deviation code "2" indicating the content of deviation are registered in the deviation code table 310.
  • the PI code (A221) of the broadcast station X is already registered in the deviation code table 310. This makes it easy to search for the content of deviation and the associated processing to be performed from the deviation processing table 380 shown in Fig. 4 , thereby speedily checking whether TMC data has been correctly received in accordance with the content of deviation.
  • a radio receiver that receives RDS broadcasts is illustrated by way of example.
  • a broadcast to be received by a radio receiver is not restricted to an RDS broadcast but may be another radio broadcast as long as data can be multiplexed into such a broadcast.
  • a broadcast to be received by a radio receiver is not restricted to an analog radio broadcast, but may be a digital radio broadcast.
  • a radio receiver having two digital tuners is illustrated by way of example.
  • tuners may output analog signals, and the number of tuners is not particularly restricted.
  • a single tuner may be used for receiving a broadcast signal and for extracting data in a time division manner, or three or more tuners may be used, and one of them may be used for extracting an RDS signal.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Communication Control (AREA)
EP13157201.8A 2012-03-05 2013-02-28 RDS-TMC-Empfänger und entsprechendes Verfahren Active EP2637326B1 (de)

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JP3271869B2 (ja) 1995-04-28 2002-04-08 株式会社ケンウッド 車載用ラジオ受信機
JP4578413B2 (ja) 2006-01-20 2010-11-10 クラリオン株式会社 Rds放送におけるtmc選局方法およびrds受信装置

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JP4181021B2 (ja) * 2003-11-27 2008-11-12 アルパイン株式会社 多重放送用受信装置および多重放送受信方法
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JP3271869B2 (ja) 1995-04-28 2002-04-08 株式会社ケンウッド 車載用ラジオ受信機
JP2990187B1 (ja) 1998-11-11 1999-12-13 日本電気アイシーマイコンシステム株式会社 Rds自動追従装置およびrds自動追従方法
JP4578413B2 (ja) 2006-01-20 2010-11-10 クラリオン株式会社 Rds放送におけるtmc選局方法およびrds受信装置

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Publication number Priority date Publication date Assignee Title
EP2947636A3 (de) * 2014-05-22 2016-03-16 Technisat Digital Gmbh Verfahren und anordnung zur verarbeitung von informationen in einem fahrzeugassistenz- und informationssystem

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EP2637326B1 (de) 2019-12-18

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