EP0503202B1 - Procédé de commande d'un récepteur RDS - Google Patents

Procédé de commande d'un récepteur RDS Download PDF

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Publication number
EP0503202B1
EP0503202B1 EP19910311992 EP91311992A EP0503202B1 EP 0503202 B1 EP0503202 B1 EP 0503202B1 EP 19910311992 EP19910311992 EP 19910311992 EP 91311992 A EP91311992 A EP 91311992A EP 0503202 B1 EP0503202 B1 EP 0503202B1
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Prior art keywords
frequency
data
reception
level
broadcasting
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EP19910311992
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German (de)
English (en)
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EP0503202A2 (fr
EP0503202A3 (en
Inventor
Koichi C/O Pioneer Electronic Corporation Kasa
Yoshiro c/o Pioneer Electronic Corp. Kunugi
Takaaki c/o Pioneer Electronic Corp. Kurosu
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Pioneer Corp
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Pioneer Electronic Corp
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Priority claimed from JP4326691A external-priority patent/JPH04280510A/ja
Priority claimed from JP4326491A external-priority patent/JPH04280508A/ja
Priority claimed from JP4326591A external-priority patent/JP2965725B2/ja
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of EP0503202A2 publication Critical patent/EP0503202A2/fr
Publication of EP0503202A3 publication Critical patent/EP0503202A3/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/27—Arrangements for recording or accumulating broadcast information or broadcast-related information

Definitions

  • the present invention relates to a method of controlling receivers of a radio data system (hereinafter called "RDS receivers").
  • radio data system which can provide radio listeners with its services by transmitting broadcasting information, such as information about the contents of programs, as data in a multiplexed modulation form at the time a broadcasting station broadcasts the programs, and permitting the listeners to select the desired program based on data acquired by demodulating the transmitted data on the receiver side.
  • broadcasting information such as information about the contents of programs
  • This radio data system uses, as a subcarrier, a 57-kHz wave, that is the third harmonic of a stereo pilot signal of 19 kHz, outside of the frequency band of FM modulation waves, subjects this subcarrier to amplitude modulation with a data signal representing broadcasting information, such as filtered and bi-phase-coded contents of programs, to yield a radio data signal, and subjects this amplitude-modulated subcarrier to frequency modulation into a main carrier before broadcasting it.
  • broadcasting information such as filtered and bi-phase-coded contents of programs
  • a block 1 includes a program identification (PI) code representing a network
  • a block 2 includes a traffic program identification (TP) code and a traffic announcement identification (TA) code
  • a block 3 includes frequency (AF) data of a group of network stations that are broadcasting the same program
  • a block 4 includes program service name information (PS), such as a broadcasting station name and a network name.
  • PI program identification
  • TP traffic program identification
  • TA traffic announcement identification
  • PS program service name information
  • Each group is classified into one of 16 types, namely types 0 to 15, by four bits in accordance with the contents of that group, with two versions, A and B, defined for each type (0-15). These type and version identification codes are located in the block 2. It is to be noted that the AF data of a network station is transmitted only in a type A group, while the PS data is transmitted in type A and B groups.
  • AF data of a group of network stations that are broadcasting the same program is previously stored in a memory, and when the field intensity of the received RDS broadcasting wave drops to a set level or below for a predetermined period of time or longer, the AF data of another station in the network station group broadcasting the same program is selectively read out from the memory to actually receive the program at the frequency specified by that AF data, and when an RDS broadcasting wave having the field intensity equal to or higher than the set level can be received, the reception of this RDS broadcasting wave would immediately take place.
  • the field intensity does not drop to or below a set level when a multipath occurs with respect to an RDS broadcasting wave that is being received with a field of medium to high intensity. In this case, therefore, even if the reception of an RDS broadcasting wave is poor, it is not possible to receive the same RDS broadcasting wave from a different station in good receiving conditions using the AF data of a group of network stations that are broadcasting the same program.
  • the program follow-up operation will be interrupted for a given period of time for any RDS broadcasting wave of the frequency received by the AF data of the same network station group stored in the memory. If the program follow-up operation is to be interrupted for a given period of time, however, even when the vehicle comes out of the tunnel to be able to receive another RDS broadcasting wave bearing the same program at a sufficient signal level, the program follow-up operation may not start immediately, resuming the poor wave reception. This could happen not only in driving through tunnels but also in driving in mountainous areas.
  • the reception signal level of the RDS broadcasting wave received by the AF data read out from the memory is simply equal to or below a set level, the reception of this RDS broadcasting wave would immediately take place, and no further AF data will be read out from the memory to detect the reception signal levels of other RDS broadcasting waves. Therefore, the reception of that RDS broadcasting wave which can ensure the best receiving conditions will not necessarily take place.
  • EP-A-0326747 concerns an RDS receiver and the problem of making a judgement as to whether the received signal strength is too low. A measurement is made of the length of time that the lock signal is not produced.
  • a method of controlling an RDS receiver having a memory holding frequency data of a group of stations in the same network, and a lock detector for detecting a lock status of a digital PLL circuit for producing a clock for demodulation of a radio data signal extracted from an FM detection output and producing a lock detection signal the method characterized by:
  • the digital PLL circuit that produces a data demodulation clock signal is in a lock state is determined from the detection output of the lock detector, the status of multipath-induced audible noise at the time of reception of an RDS broadcasting wave with an electric field of an intermediate intensity is judged from the unlock status of the PLL circuit, and when the reception of the currently receiving broadcasting wave becomes poor by a multipath, making it difficult to listen to the program, the reception frequency is automatically switched to the frequency of another station in the same network station group.
  • a method of controlling an RDS receiver having a memory containing frequency data of a group of stations in the same network comprising:
  • this control method for example, although the previous average level exceeds the first predetermined value due to a drop of the reception signal level of the currently receiving broadcasting wave as a vehicle enters or comes out of a tunnel, if the current average level is below the second predetermined value, frequency data of one station of that network station group to which a broadcasting station broadcasting the currently receiving broadcasting wave belongs is selectively read out from the memory in accordance with the frequency check signal, and switching the reception frequency to the frequency specified by the read frequency data starts.
  • the reception signal level of any RDS broadcasting wave is equal to or lower than a set level
  • the reception of the currently receiving broadcasting wave continues, and the program follow-up operation for actually receiving another broadcasting wave based on the AF data stored in the memory to detect the reception signal level will not be repeated unless the reception signal level of the currently receiving broadcasting wave substantially varies.
  • the previous average level is lower than the second predetermined value due to an increase in the reception signal level of the currently receiving broadcasting wave as a vehicle comes out of a tunnel
  • frequency data of one station of that network station group to which a broadcasting station broadcasting the currently receiving broadcasting wave belongs is selectively read out from the memory in accordance with the frequency check signal, and switching the reception frequency to the frequency specified by the read frequency data starts.
  • the method further comprises a fifth step of judging whether or not a reception signal level of the reception frequency switched in the fourth step is greater than a set level, and returning to the third and fourth steps after the judgement until all frequency data is read out from the memory; and a sixth step of selecting that piece of frequency data, among all of those pieces of frequency data judged in the fifth step to have reception signal levels greater than the set level, which has a highest reception signal level and switching the reception frequency to a frequency indicated by the selected frequency data.
  • this control method when the receiving conditions of the currently receiving RDS broadcasting wave become poor, only those pieces of AF data which can provide an electric field intensity equal to or higher than a set level are extracted first from a frequency data list stored in the memory, then that piece of AF data whose reception signal level is highest is selected from the read AF data, and the reception frequency is switched to the frequency specified by the selected AF data.
  • the receiving conditions of the RDS broadcasting wave become poor, it is possible to promptly shift to the reception of the RDS broadcasting wave having the frequency selected from the AF data list, which has an electric field equal to or higher than a set level and can ensure the best reception.
  • An RDS receiver shown in Fig. 3, where the control method of the present invention is applied,is capable of receiving not only an RDS broadcasting wave but also the broadcasting wave of a traffic information broadcasting system as well as a broadcasting wave carrying an RDS signal multiplexed with the signal of the traffic information broadcasting system.
  • the traffic information broadcasting system provides traffic information to car radio listeners, etc. in a time sharing manner while a program of a general broadcasting station is broadcast, and is usually called "ARI system.”
  • ARI system In this system as well as an RDS system, a subcarrier of 57 kHz is treated as a traffic information station identification (ID) signal (SK signal) which indicates a station for sending the traffic information on the air.
  • ID traffic information station identification
  • SK signal traffic information station identification
  • the 57-kHz subcarrier When the traffic information is broadcast, the 57-kHz subcarrier is subjected to amplitude modulation by an area ID signal (in the range of 23.75 to 53.98 kHz) indicating for which area the traffic information is, and a message ID signal (a single tone of 125 kHz) which indicates that the traffic information is being broadcast.
  • the amplitude-modulated subcarrier is then subjected to frequency modulation into a main carrier before broadcasting it.
  • the 57-kHz subcarrier is used in both the RDS and traffic information broadcasting system.
  • the subcarrier of the RDS has a phase difference of about ⁇ /2 from that of the traffic information broadcasting system, so that the subcarrier (RDS signal) amplitude-modulated by the data signal is distinguished from the subcarrier (SDK signal) amplitude-modulated by the message signal (DK signal) of the traffic information broadcasting system.
  • an FM multiplexed broadcasting wave received at an antenna 1 is sent to a front end 2 where a desired station is selected, and is converted into a wave of an intermediate frequency (IF), which is in turn supplied through an IF amplifier 3 to an FM detector 4.
  • the front end 2 generates a transmission signal to a mixer 2b by a PLL synthesizer system using a PLL circuit 2a including a programmable frequency divider.
  • the front end 2 performs channel selection based on the frequency dividing ratio of the programmable frequency divider controlled by a controller 14 to be described later.
  • the output of the FM detector 4 is supplied to an MPX (multiplex) demodulator 5, and, in the case of a stereophonic broadcast, it is separated into audio signals of R (right) and L (left) channels.
  • the output of the FM detector 4 is sent through a filter 6, so as to extract a 57-kHz subcarrier, that is, a radio data signal amplitude-modulated by a biphase-coded data signal.
  • This subcarrier is then demodulated in a PLL circuit 7.
  • An SDK detector provided in the PLL circuit 7 though not shown, detects when the RDS and SDK signals are present at the same time.
  • the output of the SDK detector is sent to the controller 14.
  • the circuit disclosed in Japanese Patent Application Provisional Publication No. 63-87052 is used as the PLL circuit 7, for example.
  • the demodulation output of the PLL circuit 7 is supplied to a digital (D) PLL circuit 8 and a decoder 9.
  • the D-PLL circuit 8 Based on the demodulation output from the PLL circuit 7, the D-PLL circuit 8 generates a clock for data demodulation.
  • the generated clock is supplied to a gate circuit 10.
  • An output signal from the lock detector 11 is sent to the gate circuit 10 so as to control the gate circuit 10 to be enabled when the D-PLL circuit 8 is unlocked.
  • the output signal of the lock detector 11 is also sent to the controller 14 as well as the PLL circuit 7 and D-PLL circuit 8 as a lock range select signal for selecting the lock ranges of the PLL circuit 7 and the D-PLL circuit 8.
  • the lock detector 11 detects the lock status of the D-PLL circuit 8
  • the lock ranges of the PLL circuit 7 and the D-PLL circuit 8 become narrower so that the clock for data demodulation can always be supplied as a stable clock, free of external influences.
  • the biphase-coded data signal as the demodulation output from the PLL circuit 7 is decoded by the decoder 9 in synchronism with the clock generated by the D-PLL circuit 8.
  • the output data from the decoder 9 is separated into groups each consisting of four 26-bit blocks, a total of 104 bits.
  • the output data is sequentially supplied to a group-block synchronizing/error-detecting circuit 12.
  • the circuit 12 performs a group-to-block synchronization on the basis of 10-bit offset words which are respectively assigned to 10-bit check words in the blocks, and detects an error in 16-bit information words on the basis of the check words.
  • the error detected data is corrected in an error correcting circuit 13 at the next stage, and then is supplied to the controller 14.
  • the controller 14 constituted by a microcomputer, fetches code information of each block in radio data which is received group by group, i.e., radio data information (above-described PI code, AF data, PS data, etc.) which is associated with the contents of the program from a broadcasting station currently being received, and stores the information in the memory 15.
  • radio data information above-described PI code, AF data, PS data, etc.
  • an AF data list (AF data f 1 , f 2 , ..., f n ) of stations in the same network as the station currently broadcasting the program is prepared.
  • the controller 14 controls the value of received frequency data to determine the frequency-dividing ratio for the programmable frequency divider (not shown) in the PLL circuit 2a, provided as a part of the front end 2, and selects the desired station or channel.
  • the value of the received frequency data is a count value of a counter, for example.
  • a level detector 19 detects the level (field intensity) of a receive signal on the basis of the level of the IF signal in the IF amplifier 3.
  • a station detector 20 outputs a station detection signal when the level of the IF signal in the IF amplifier 3 is equal to or above a determined or set level and the detection output having a so-called "S" curved characteristic from the FM detector 4 is within a predetermined level range.
  • the output signals from the level detector 19 and the station detector 20 are supplied to the controller 14.
  • the memory 15 includes an nonvolatile RAM where data, such as the reception frequency data, the PI code and the AF data, are to be written, and a ROM where programs and data are previously written.
  • a lock detecting routine shown in Fig. 4 is performed at every predetermined timing in program follow-up mode.
  • the processor resets a timer value T of the timer and a count value C of the counter to their initial values (e.g., both to "0") (step S101).
  • the timer value T and the count value C are determined by executing steps S101 to S104, etc.
  • the timer value T of the timer is incremented by unit time "T 1 " (step S102), and then it is determined whether or not the lock detection signal is sent from the lock detector 10 (step S103).
  • step S104 determines if the timer value T has overflowed (step S105), i.e., whether or not the timer value T has reached a set time T MAX . If the lock detection signal is supplied from the lock detector 10, the process in step S105 is immediately performed. If T ⁇ T MAX , the flow returns to step S102. Though not shown in the flowchart, if T ⁇ T MAX , the process in step S102 is performed after the lapse of the unit time T 1 is determined.
  • the processor fetches the reception signal level V s received from the level detector 19 (step S106). It is then determined from the output of the SDK detector in the PLL circuit 7 if the received broadcasting wave is an RDS-broadcast and also ARI-broadcast wave by the ARI system (step S107). If the received broadcasting wave is an RDS- and an ARI-broadcast wave, the processor searches a first data map for a reference value C r corresponding to the reception signal level V s , and sets the value C r (step S108).
  • the processor searches a second data map for the reference value C r , and sets the value C r (step S109).
  • the first and second data maps referred to in searching for the reference value C r are previously stored in the memory 15.
  • the processor determines if the count value C of the counter is greater than the reference value C r (step S110). If C > C r , the processor considers that the multipath has greatly affected the count value, and executes an AF check routine (step S111). If C ⁇ C r , the influence of the multipath is comparatively small, and the processor terminates the lock detecting routine.
  • the processor reads AF data fAF from an AF data list of AF data f 1 , f 2 ..., f n , which is written into the memory 15, and sets the read data to the frequency divider in the PLL circuit 2a (step S121). Accordingly, the reception frequency changes to the frequency of another station in the same network.
  • the processor determines if the reception signal level V s at the new reception frequency selected with reference to the AF data list is a set level V 1 or lower (step S122).
  • step S122 is performed upon the lapse of a time which is sufficient for the reception frequency to become stable from the point of time at which the AF data has been set in step S121. If the reception signal level V s is higher than the set level V 1 , the reception frequency data in the memory 15 is updated to the AF data fAF to maintain the reception condition (step S123). The AF check routine is then terminated. In the next execution of the AF check routine, the frequency of the AF data fAF will become a new reception frequency f D for the program follow-up operation.
  • the processor newly fetches AF data in and rewrites the data f 1 , f 2 , ..., f n on the AF data list in the memory 15.
  • the processor reads the reception frequency data from the memory 15 to receive the original broadcasting wave again, and sets the read data to the frequency divider in the PLL circuit 2a (step S124). It is then determined if the previous broadcasting wave has been received in a predetermined time (step S125). If a predetermined time has elapsed, it is determined whether or not all the AF data on the AF data list has been read out (step S126).
  • the AF check routine will be terminated. If all the AF data on the AF data list has not yet been read out, the flow returns to step S121 to read a new piece of AF data.
  • the processes in the lock detecting routine are repeated at every given timing, and the D-PLL circuit 8 is unlocked by the generation of the multipath in the reception of the RDS broadcasting wave with the frequency f D . If the number (count value of the counter) C of the unlock states, which are detected by determining the lock or unlock state at every unit time T 1 within the set time T MAX , is larger than the reference value C r , the influence of the multipath is considered great.
  • the AF data of the frequency f 1 is then read from the AF data list of the data f 1 , f 2 , ..., f n for the same network, which are written into the memory 15, and sent to the frequency divider of the PLL circuit 2a.
  • the reception frequency changes to the frequency f 1 of another station in the same network. If the reception signal level V s at the new frequency f 1 is higher than the set level V 1 , the reception conditions are retained. When the reception signal level V s is equal to the set level V 1 or lower, the reception of the broadcasting wave at the previous frequency f D starts. After a predetermined time has elapsed, AF data of the frequency f 2 is read from the AF data list of the data f 1 , f 2 , ..., f n and is sent to the frequency divider of the PLL circuit 2a.
  • the reception frequency changes: f D ⁇ f 1 ⁇ f D ⁇ f 2 ....
  • This frequency change is repeated until detection of such a broadcasting wave that the reception signal level V s of that network station group to which the station for the frequency f D belongs is higher than the set level V 1 .
  • the AF check routine is executed, providing the RDS broadcasting wave of V s > V 1 from the data f 1 , f 2 , ..., f n on the AF data list of the same network, the lock detecting routine will be performed on the RDS broadcasting wave.
  • a muting circuit (not shown) is activated to cut off the output of an audio signal. The muting state is released when the broadcasting wave having the reception signal level V s higher than the set level V 1 is detected.
  • step S122 when V s ⁇ V 1 in step S122, the flow advances to step S124 to receive the previous broadcasting wave.
  • the flow may return to step S121 when V s ⁇ V 1 , to thereby read out a new piece of AF data fAF among the data f 1 , f 2 , ..., f n on the AF data list and sent it to the frequency divider of the PLL circuit 2a.
  • all the AF data f 1 , f 2 , ..., f n on the AF data list may be checked to detect the RDS broadcasting wave of V s > V 1 , and only when that RDS broadcasting wave cannot be detected, the reception of the previous broadcasting wave should be restarted.
  • all the pieces of the AF data on the AF data list, f 1 , f 2 , ..., f n may be checked to read the reception signal level of the individual data, and when the RDS broadcasting waves of V s > V 1 are detected, the RDS broadcasting wave having the highest field intensity may be received thereafter.
  • the frequency data of the same network station group has been stored in the memory by acquiring the AF data from the RDS broadcasting wave being received.
  • the frequency data of the same network station group for each receivable broadcasting station may be previously stored in the memory.
  • this increment of the count value may be performed when the lock detection signal is generated and the influence of a multipath is considered significant when the count value C in the set time T MAX is smaller than the reference value, followed by the execution of the AF check routine.
  • Fig. 6 illustrates a lock detecting routine according to a second embodiment of this invention.
  • This lock detecting routine like the one shown in Fig. 4, is executed by the processor in the controller 14 in the receiver shown in Fig. 3.
  • the timer value and count value are to be determined by performing steps described below.
  • the processor resets a timer value T of the timer and a count value C of a lock counter to their initial values (e.g., both to "0") (step S131).
  • the timer value T of the timer is incremented by unit time "T 1 " (step S132), and then it is determined whether or not the lock detection signal is sent from the lock detector 10 (step S133).
  • the steps up to this point are identical to steps S101 to S103 in the routine shown in Fig. 4.
  • step S133 When generation of the lock detection signal is determined in step S133, the count value C of the lock counter is incremented by "1" (step S134). It is then determined if the timer value T becomes equal to a first set time T MAX or greater and has overflowed (step S135). If the lock detection signal is not produced and the unlock detection signal is supplied from the lock detector 10, the process in step S135 is immediately performed. If T ⁇ T MAX , the flow returns to step S132. Though not shown in the flowchart, if T ⁇ T MAX , the process in step S132 is performed after the lapse of the unit time T 1 is determined.
  • step S135 it is determined whether or not the count value C of the lock counter is greater than a predetermined value C 2 (step S136). When C ⁇ C 2 , it is then determined whether or not the count value C of the lock counter is smaller than a predetermined value C 1 (C 2 > C 1 ) (step S137). When C > C 2 , a count value R of an AF trigger counter is reset to an initial value (e.g., "0") (step S138). When C ⁇ C 1 , the count value R of the AF trigger counter is incremented by "1" (step S139). After execution of step S138 or S139, the flow advances to step S140.
  • step S140 After incrementing a count value U of a set time counter by "1" in step S140, it is determined whether or not the count value U has reached a predetermined value m indicating a second set time U m (step S141). Since step S140 is executed upon each lapse of nearly the time T MAX due to the execution of step S135, m ⁇ T MAX becomes the second set time U m . When U ⁇ m, this routine will be terminated.
  • step S142 When U ⁇ m, which means that the second set time U m has elapsed, the count value U of the set time counter is reset to an initial value (e.g., "0") (step S142). Then it is determined whether or not the count value R of the AF trigger counter at that time has reached a reference value R r (step S143).
  • R ⁇ R r the AF check routine will be executed, considering that the influence of a multipath is prominent (step S144).
  • R ⁇ R r this routine will be terminated, judging that the influence of the multipath is relatively small.
  • the D-PLL circuit 8 For each unit time T 1 , it is determined whether or not the D-PLL circuit 8 is in a lock state and the number of discriminations C (the count value of the lock counter) of the lock state within the first set time T MAX can be acquired.
  • C ⁇ C 1 it is judged that the D-PLL circuit 8 has been locked many times by a multipath, and the count value R of the AF trigger counter is incremented by "1.”
  • the count value R of the AF trigger counter is reset, while when C 1 ⁇ C ⁇ C 2 , the count value R of the AF trigger counter at that time is maintained.
  • the count value R of the AF trigger counter has reached the reference value R r within the second set time U m , the influence of the multipath is judged prominent, and the AF check routine shown in Fig. 5 will be executed.
  • the frequency data of one station of that group of network stations to which a broadcasting station of the receiving broadcasting wave belongs is read out from the memory when the number of times it is determined, in a set time,that the lock detection signal is not produced is greater than a reference value, and the reception frequency is switched to the frequency specified by the read frequency data.
  • the count value of the AF trigger counter is incremented by "1" when the number of times it is determined that the lock detection signal is produced within the first set time is smaller than the first predetermined value, the count value of the counter is retained when the number of determinations is greater than the first predetermined value and is equal to or lower than the second predetermined value which is larger than the first predetermined value, the count value of the counter is reset to the initial value when the number of determinations is greater than the second predetermined value, the frequency data of one station of that group of network stations to which a broadcasting station of the receiving broadcasting wave belongs is selectively read out from the memory when the count value of the counter in the second set time is greater than the reference value, and the reception frequency is switched to the frequency specified by the read frequency data.
  • whether the digital PLL circuit that produces a data demodulation clock is in a lock state is determined from the detection output of the lock detector, and the status of multipath-induced audible noise at the time of reception of an RDS broadcasting wave with an electric field of an intermediate intensity is determined from the frequencies of the unlock status of the PLL circuit.
  • the reception frequency is automatically switched to the frequency of another station in the same network station group. Accordingly, even in the case where a multipath disturbance occurs, the same program broadcasted by another station in the network station group can continuously be listened to in a good receiving condition.
  • the processor When the processor detects that the program follow-up button (not shown) in the operation section 16 has been operated, the processor sets the program follow-up mode, and the AF check routine shown in Figs. 7 and 8 is performed at every given timing.
  • the processor resets the timer value T of the timer to an initial value (e.g., "0") (step S201).
  • An AF check trigger flag F TR and a PI search request flag F RQ are both reset to "0" (step S202).
  • the timer value T is determined by executing steps S201, S204 and S206.
  • a variable m is set equal to "1" (step S203), the timer value T of the timer is incremented by unit time “T 1 " (step S204), and the reception signal level V s output from the level detector 19 is latched and stored as a latch value V s (m) in the memory 15 (step S205). It is then determined if the timer value T has overflowed (step S206), i.e., whether or not the timer value T has reached a set time T MAX . If T ⁇ T MAX , the variable m is incremented by "1" (step S207) and the flow returns to step S204. Though not shown in the flowchart, if T ⁇ T MAX , the process in step S204 is performed after the lapse of the unit time T 1 is determined.
  • the processor computes an average level V AV of the reception signal levels V s (1), V s (2), ..., V s (m) (step S208). That is, the reception signal levels V s (1), V s (2), ..., V s (m) are read out from the memory 15 and are added together to acquire the total value, and this total value is divided by the variable m. After the compution of the average level V AV , this average level V AV is read out as V AV-1 (step S209), and it is determined whether or not the average level V AV is smaller than a predetermined value V L (second predetermined value) (step S210).
  • V L second predetermined value
  • V AV ⁇ V L it is determined whether or not the previous average level V AV-1 is greater than a predetermined value V H (first predetermined value) (step S211).
  • V AV ⁇ V L it is determined whether or not the previous average level V AV-1 is greater than a predetermined value V H (first predetermined value) (step S211).
  • the predetermined value V H is greater than the predetermined value V L .
  • V AV-1 > V H the PI search request flag F RQ is set to "1" (step S212), the AF check trigger flag F TR is set to "1" (step S213), and the current average level V AV is stored in the memory 15 (step S214). Even if V AV ⁇ V L , when V AV-1 ⁇ V H is determined in step S211, the flow advances to step S214. Setting the flag F TR to "1" generates the frequency check signal.
  • step S210 it is determined whether or not the average level V AV is greater than the predetermined value V H (step S215).
  • V AV > V H it is determined whether or not the previous average level V AV-1 is smaller than the predetermined value V L (step S216).
  • V AV-1 ⁇ V L the flow returns to step S213 to set the AF check trigger flag F TR to "1". Even if V AV ⁇ V L , when V AV ⁇ V H is determined in step S215, the flow moves to step S214. Further, even if V L ⁇ V AV ⁇ V H , when V AV-1 ⁇ V L is determined in step S216, the flow also advances to step S214.
  • step S214 it is determined whether or not the AF check trigger flag F TR is equal to "1" (step S217).
  • the processor reads the lock signal V s at the new reception frequency selected by one piece of AF data f (m) on the AF data list (step S221), and determines if V s is greater than a set level V 1 (step S222).
  • the process in step S221 is performed upon the lapse of a time sufficient for the reception frequency to become stable from the point of time at which the AF data has been set in step S220.
  • V s ⁇ V 1 it is determined whether or not the variable u has reached the number of pieces of the AF data, n, on the AF data list (step S223).
  • step S224 AF data that can ensure the reception signal level V s > V 1 can be selected from the individual pieces of AF data f (1) , f (2) , ..., f (n) on the AF data list.
  • V s > V 1 in step S222 the reception frequency data in the memory 15 is updated to the AF data f (u) to maintain the reception conditions (step S225) before terminating this routine.
  • the broadcasting wave will be received at the frequency specified by the AF data f (u) That is, the same program as the currently receiving broadcasting wave which has been received immediately before the mode change to the program follow-up mode, is broadcasted, that broadcasting wave whose reception signal level is higher than the set level V 1 is received, that broadcasting station employing this frequency becomes a new current broadcasting station, and the program follow-up mode is terminated.
  • the reception frequency data in the memory 15 is therefore read out and is set to the frequency divider in the PLL circuit 2a to receive again the currently receiving broadcasting wave, which has been received immediately before the mode change to the program follow-up mode (step S227).
  • the reception conditions become those under which that broadcasting wave which has been received immediately before the mode change to the program follow-up mode. This routine is then terminated to shift the mode from the program follow-up mode to the usual reception mode.
  • the PI search operation starts.
  • the reception frequency data of the current broadcasting station is read out as search frequency data from the memory 15 (step S229).
  • the value of the search frequency data is then increased by a predetermined number (e.g., 100 kHz as the reception frequency) (step S230).
  • a predetermined number e.g. 100 kHz as the reception frequency
  • the search frequency data is set to the frequency divider in the PLL circuit 2a (step S232).
  • step S233 It is then determined whether or not a station detecting signal is generated from the station detector 20 (step S233). Though not shown in the flowchart, step S233 is executed upon the lapse of a time sufficient for the reception frequency to become stable after the setting of the AF data in step S232.
  • the station detecting signal is generated, the reception signal level V s is latched (step S234), and it is determined whether or not V s is higher than the set level V 1 (step S235). If V s > V 1 , it is determined if the searched and received broadcasting wave is an RDS broadcasting wave (step S236). This determination is made by checking whether or not various data can be obtained from the error correcting circuit 12.
  • the PI code of the received broadcasting wave is latched (step S237), and the PI code of the current broadcasting station is read from the memory 15 (step S238). It is then determined if both PI codes of the searched and received broadcasting wave and the current broadcasting station coincide with each other (step S239). If both PI codes are matched with each other, the reception frequency data in the memory 15 is updated in accordance with the searched frequency data to maintain the reception condition (step S240) before this routine is terminated. The broadcasting wave is therefore received at the frequency determined by the searched frequency data.
  • step S233 When it is determined in step S233 that the station detecting signal has not been produced, or when V s ⁇ V 1 in step S235, or when it is determined in step S236 that the received broadcasting wave is not an RDS broadcasting wave, or when both PI codes are not judged to coincide with each other in step S239, the flow advances to step S230 where the value of the search frequency data is increased by a predetermined number. Thereafter, the above-described operation will be repeated.
  • step S231 When it is determined in step S231 that the search frequency data is identical to the reception frequency data of the current broadcasting station, the RDS broadcasting wave whose PI code is matched with that of the current broadcasting station at the reception signal level of V s > V 1 cannot be received, although complete searching within the reception band has been finished.
  • the flow therefore moves to step S227, and the reception frequency data is read out from the memory 15 and is set to the frequency divider in the PLL circuit 2a in order to try receiving that broadcasting wave which has been received immediately before the mode change to the program follow-up mode.
  • a muting circuit (not shown) is activated to cut off the output of an audio signal. The muting state is released when the program follow-up mode is terminated.
  • the operational transition immediately takes place to be ready for reception of the broadcasting wave for that piece of AF data, thus terminating the program follow-up mode. It is however possible that the reception signal levels V s for all the pieces of AF data on the AF data list are acquired, then that piece of AF data which has the highest reception signal level V s greater than the set level V 1 is extracted, and the operational transition to the reception of the broadcasting wave for that AF data takes place, thus terminating the program follow-up mode.
  • the frequency data of the same network station group has been stored in the memory by acquiring the AF data from the RDS broadcasting wave being received according to this embodiment, the frequency data of the same network station group for each receivable broadcasting station may be previously stored in the memory.
  • the average level of the reception signal level of a currently receiving broadcasting wave in a predetermined time is detected at every given timing, and when the previous average level is higher than the first predetermined value and the current average level is lower than the second predetermined value smaller than the first predetermined value, or when the previous average level is lower than the second predetermined value and the current average level is higher than the first predetermined value, frequency data of one station of that network station group to which a broadcasting station broadcasting the currently receiving broadcasting wave belongs is selectively read out from the memory and the reception frequency is switched to the frequency specified by one piece of the read frequency data.
  • the program follow-up operation for actually receiving another broadcasting wave based on the frequency data stored in the memory to detect the reception signal level would not be performed.
  • the program follow-up operation since the program follow-up operation is not repeated even if the reception signal level of the currently receiving broadcasting wave is kept lower than the set level, the reception frequency does not change, thus preventing the program from becoming very difficult to listen to. Even when a vehicle is running in a tunnel or a mountainous area, the program follow-up operation will start at the proper timing, permitting prompt transition to the reception of that RDS broadcasting wave which can ensure good reception.
  • the processor When the processor detects that the program follow-up button (not shown) in the operation section 16 has been operated, the processor sets a program follow-up mode.
  • a lock detecting routine and a field intensity detecting routine are performed at every predetermined timing in this program follow-up mode.
  • the processor resets the timer value T of the timer and the count value C of the counter to their initial values (e.g. both to "0") (step S301).
  • the timer value T and the count value C are determined by executing steps S301 to S304, etc.
  • the timer value T of the timer is incremented by unit time "T 1 " (step S302), and then it is determined whether or not the lock detection signal is sent from the lock detector 10 (step S303). If the lock detection signal is not generated but the unlock detection signal is generated, the D-PLL circuit 8 is judged to be in the unlock state due to the occurence of a multipath. The count value C of the counter is thus incremented by "1" (step S304). It is then determined if the timer value T has overflowed (step S305). That is, it is determined whether or not the timer value T has reached a set time T MAX . If the lock detection signal is supplied from the lock detector 10, the process in step S305 is immediately performed. If T ⁇ T MAX , the flow returns to step S302. Though not shown in the flowchart, if T ⁇ T MAX , the process in step S302 is performed after the lapse of the unit time T 1 is determined.
  • the processor reads the reception signal level V s received from the level detector 19 (step S306), and searches a data map for the reference value C r corresponding to the reception signal level V s , and sets the value C r (step S307).
  • the data map referred to in searching for the reference value C r is previously stored in the memory 15.
  • the processor determines if the count value C of the counter is greater than the reference value C r (step S308). If C > C r , the processor sets a flag F 1 to "1", indicating that the unlock state of the D-PLL circuit 8 has frequently occurred and the influence of a multipath is significant (step S309), and executes an AF check routine (step S310).
  • step S311 If C ⁇ C r , the influence of the multipath is relatively small, and the processor resets the flag F 1 to "0" (step S311), thus terminating this lock detecting routine.
  • the setting of the flag F 1 to "1" generates a first frequency check signal.
  • the processor latches the reception signal level V s output from the level detector 19 (step S321), and determines whether or not V s is smaller than a set level V r (step S322). When V s ⁇ V r , it is then determined if a low-level (low field intensity) reception has continued for a predetermined time t 1 or longer (step S323). When the low-level reception of V s ⁇ V r has continued for the predetermined time t 1 or longer, the processor sets a flag F 2 to "1", indicating that the currently receiving broadcasting wave is in low-level receiving condition (step S324), and executes the AF check routine (step S325). When V s ⁇ V r , which means no low-level reception, the processor resets the flag F 2 to "0" (step S326), thus terminating this routine.
  • the processor first determines if the flag F 1 is equal to "1" or not (step S331).
  • F 1 1, which indicates that the unlock state of the D-PLL circuit 8 has frequently occurred
  • the set level V 1 is set to a predetermined level V A (step S332).
  • F 1 0, it is determined whether or not the flag F 2 equals "1" (step S333).
  • F 2 1, which means that the currently receiving broadcasting wave is in low-level receiving condition
  • the set level V 1 is set to a predetermined level V B (step S334).
  • F 2 0, this routine will be terminated. It is to be noted that the predetermined level V A is higher than the predetermined level V B .
  • the setting of "1" to the flag F 2 generates a second frequency check signal.
  • step S332 or S334 After execution of step S332 or S334, the variable m is set equal to "1" (step S335) and the variable u to "0" (step S336). And AF data f (m) from the AF data list of AF data f (1) , f (2) , ..., f (n) , which is written into the memory 15, is read out and is set to the frequency divider in the PLL circuit 2a (step S337). Accordingly, the reception frequency changes to the frequency of another station in the same network as the current broadcasting station.
  • the processor latches the reception signal level V s at the new reception frequency selected by one piece of AF data f (m) on the AF data list (step S338), and determines if V s is greater than the set level V 1 or not (step S339).
  • the process in step S338 is performed upon the lapse of a time sufficient for the reception frequency to become stable from the point of time at which the AF data has been set in step S337.
  • V s ⁇ V 1 the flow advances to step S343 to be described later.
  • the PI code representing the network of the broadcasting station associated with the AF data f (m) is latched (step S340), and the variable u is incremented by "1" (step S341). Then, the AF data f (m) the reception signal level V s and the latched PI code are stored respectively as check AF data cf (u) , reception signal level V s (u) and PI(u) into the memory 15 (step S342). It is then determined if the variable m has reached the number of pieces of AF data, n, on the AF data list (step S343).
  • step S344 When m ⁇ n, the variable m is incremented by "1" (step S344), and the flow returns to step S337. Repeating this operation, all of those pieces of the AF data f (1) , f (2) , ..., f (n) on the AF data list which can ensure the reception signal level V s > V 1 , or all the check AF data is written in the memory 15.
  • m n, meaning that checking the reception signal level has been done on every piece of AF data f (1) , f (2) , ..., f (n) in step S339, the flow then advances to step S345.
  • the value of the variable u at that time indicates the number of pieces of AF data which have ensured the reception signal level V s > V 1 .
  • step S345 it is determined whether or not the variable u equals "0".
  • u 0, meaning that the reception signal level V s > V 1 could not be acquired at another broadcasting station that is broadcasting the same program as the current broadcasting station, the flow then advances to step S358 to be described later.
  • V MAX the value of the maximum level
  • step S346 the value of the maximum level, V MAX , is set equal to the initial value (e.g., "0") (step S346), and a variable w to "1" (step S347).
  • the PI code of the current broadcasting station (broadcasting station whose broadcasting wave has been received immediately before the mode change to the program follow-up mode) is read out from the memory 15 (step S348), and a PI code PI(w) is read out from the memory 15 (step S349). It is then determined if the PI code of the current broadcasting station is matched with the PI code PI(w) (step S350). When these PI codes differ from each other, the flow moves to step S355 to be described later.
  • the reception signal level V s (w) is read out from the memory 15 (step S351), and it is determined whether or not V s (w) is greater than the maximum level value V MAX (step S352).
  • V s (w) ⁇ V MAX the flow goes to step S355, while when V s (w)> V MAX , the reception signal level V s (w) is set to the maximum level value V MAX ) (step S353) and the variable w is treated as a select number x (step S354).
  • step S354 it is determined if the variable w has reached the variable u (step S355).
  • step S356 When w ⁇ u, the variable w is incremented by "1" (step S356), and the flow returns to step S349.
  • V MAX the initial value
  • V MAX the initial value
  • the reception frequency data is read out from the memory 15 and is set to the frequency divider in the PLL circuit 2a in order to return to the reception of the currently receiving broadcasting wave that has been received immediately before the mode change to the program follow-up mode (step S358).
  • This routine is then terminated to change the mode to the normal reception mode from the program follow-up mode.
  • the check AF data cf(x) that has provided the maximum level value V MAX as the reception signal level is read out from the memory 15 and is set to the frequency divider in the PLL circuit 2a (step S359).
  • the reception frequency data in the memory 15 is updated to the check AF data cf(x) (step S360) before terminating this routine.
  • the broadcasting wave is received at the frequency specified by the check AF data cf(x).
  • the broadcasting wave of that one of the broadcasting stations broadcasting the same program as the currently receiving broadcasting wave that has been received immediately before the mode change to the program follow-up mode, which has the highest field intensity, is received, the broadcasting station using that frequency becomes a new current broadcasting station, and the program follow-up mode is then terminated.
  • a muting circuit (not shown) is activated to cut off the output of an audio signal.
  • the muting state is released when the program follow-up mode is terminated.
  • the check AF data that can assure the reception signal level V s > V 1 is written in the memory 15.
  • a modification may be made so that when V s > V 1 is judged in step S339, it is then determined if the PI code of the current broadcasting station coincides with the PI code PI(w) in question, and when the PI codes coincide with each other, it is determined whether or not the reception signal level V s is greater than the maximum level value V MAX , thus yielding the AF data of that one of the broadcasting station broadcasting the same program as the currently receiving broadcasting wave which has the highest field intensity, eliminating the need to write the check AF data in the memory 15.
  • the frequency data of the same network station group has been stored in the memory by acquiring the AF data from the RDS broadcasting wave being received.
  • the frequency data of the same network station group for each receivable broadcasting station may be previously stored in the memory.
  • the selection is not limited to this particular way.
  • the noise level may be detected together with the reception signal level so that the AF data which ensures good reception is selected according to these two levels.
  • the receiving condition of the currently receiving RDS broadcasting wave becomes poor
  • only those pieces of AF data which can provide an electric field intensity equal to or higher than a set level is extracted first from a frequency data list stored in the memory, then that piece of AF data whose reception signal level is highest is selected from the read AF data, and the reception frequency is switched to the frequency specified by the selected AF data.
  • poor reception occurs, therefore, it is possible to promptly shift to the reception of the RDS broadcasting wave having the frequency selected from the AF data list, which has an electric field equal to or higher than a set level and can ensure the best reception.

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Claims (6)

  1. Méthode de contrôle de récepteur de système de données de radio «RDS» ayant une mémoire retenant les données de fréquence d'un groupe de postes dans le même réseau, et un capteur de verrouillage pour la détection de l'état de verrouillage d'un circuit PLL alphanumérique (8) pour obtenir une horloge de démodulation d'un signal de données radio extrait d'une sortie de captage MF et produisant un signal capteur de verrouillage, la méthode étant caractérisée par:
    une première phase (S133) d'estimatif qui juge si en l'affirmative ou au contraire le signal capteur de verrouillage est produit à chaque unité de temps lors de la réception d'onde de diffusion;
    une deuxième phase (S134) d'incrémentation d'une valeur de décompte de compteur d'une unité «1» lorsque la fréquence de l'estimatif de première phase selon laquelle le signal capteur de verrouillage réalisé en un premier temps programmé s'avère inférieure à une première valeur prédéterminée, la valeur de décompte au compteur lorsque la fréquence de l'estimatif s'avère supérieure à la première valeur programmée et égale ou inférieure à une deuxième valeur programmée supérieure à la première programmée, ainsi que la remise de la valeur de décompte au compteur à une valeur initiale lorsque la fréquence de l'estimatif est supérieure à la deuxième valeur programmée;
    une troisième phase (S220) de lecture sélective des données de fréquence d'un poste du groupe de postes du réseau auquel appartient un poste de diffusion à partir de la mémoire lorsque la valeur de décompte au compteur d'un deuxième temps programmé s'avère supérieure à une valeur de repère; et
    une quatrième phase (S220) de commutation d'une fréquence de réception à une fréquence indiquée par les données de fréquence dont la lecture est effectuée en troisième phase.
  2. Méthode de contrôle d'un récepteur RDS ayant une mémoire contenant les données de fréquence d'un groupe de postes du même réseau, comportant:
    une première phase (S208) de détection d'un niveau moyen de signal de réception d'onde de diffusion actuellement en réception dans un temps prédéterminé à chaque délai indiqué; et caractérisé par
    une deuxième phase (S213) de production d'un signal de vérification de fréquence lorsqu'un niveau moyen précédent est supérieur à une première valeur prédéterminée et un niveau moyen actuel est inférieur à une deuxième valeur prédéterminée inférieure à la première valeur prédéterminée, ou lorsque le niveau moyen précédent est inférieur à la deuxième valeur prédéterminée et le niveau moyen actuel est supérieur à une première valeur prédéterminée; et
    une troisième phase (S220) de lecture sélective de données de fréquence d'un poste du groupe de postes du réseau auquel appartient un poste de diffusion émettant l'onde actuelle de réception de diffusion à partir d'une mémoire en conformité avec le signal de vérification de fréquence, et la commutation d'une fréquence de réception à une fréquence indiquée par les données de fréquence de lecture.
  3. Méthode de contrôle selon la revendication 2, suivant laquelle lorsque le niveau du signal de réception à la fréquence de réception commutée en troisième phase est supérieure au niveau programmé, les conditions actuelles de réception étant maintenues, lorsque le niveau de signal de réception est égal ou inférieur au niveau programmé, la lecture de nouvelles données de fréquence est effectuée, et lorsque les niveaux de signal de réception à des fréquences indiquées par toutes les pièces de données de fréquence du poste de même groupe de réseau sont égaux ou inférieurs au niveau programmé, le retour étant alors effectué aux conditions de réception de l'onde de diffusion de la première phase.
  4. Méthode selon la revendication 2 ou 3, suivant laquelle lorsque le signal de réception de vérification de fréquence est émis quand un niveau moyen précédent en deuxième phase dépasse la première valeur prédéterminée et un niveau moyen actuel est inférieur à la deuxième valeur prédéterminée inférieure à la première valeur prédéterminée, si aux fréquences stipulées par toutes les pièces de données de fréquence du même groupe de postes de réseau les niveaux de réception de signal sont égaux ou inférieurs à la valeur programmée en troisième phase, l'onde de diffusion dont le niveau de signal de réception est égal ou supérieur au niveau programmé et dont le code d'identification de programme saisi en conséquence coïncide avec celui de l'onde actuelle de réception de diffusion est captée lors du balayage de la fréquence de réception.
  5. Méthode selon la revendication 1. comportant en outre:
    une cinquième phase d'estimatif en affirmative ou contraire d'un niveau de signal de réception en commutation de quatrième phase est supérieure à un niveau programmé, et le retour aux troisième et quatrièmes phases après l'estimatif jusqu'à la lecture de toutes les données de fréquence à partir de la mémoire; et
    une sixième phase de sélection parmi toutes les pièces de données de fréquence estimées en cinquième comme ayant des niveaux de signal de réception supérieurs au niveau programmé, de la pièce de données de fréquence qui comporte un niveau supérieur de signal de réception, et la commutation par les données de fréquence sélectionnées de la fréquence de réception à une fréquence indiquée.
  6. Méthode selon la revendication 2. comportant en outre:
    une quatrième phase d'estimatif en affirmative ou contraire d'un niveau de signal de réception de fréquence de réception en commutation en troisième phase qui est supérieure à un niveau programmé, et le retour à la troisième phase suite à l'estimatif jusqu'à ce que la lecture de toutes les données de fréquence soit effectuée à partir de la mémoire; et
    une cinquième phase de sélection parmi toutes les pièces de données de fréquence estimées en quatrième phase comme ayant des niveaux de signal de réception supérieurs au niveau programmé, de la pièce de données de fréquence dont le niveau de signal de réception de signal réglé est le plus élevé et la commutation de la fréquence de réception une fréquence indiquée par la fréquence sélectionnée des données.
EP19910311992 1991-03-08 1991-12-23 Procédé de commande d'un récepteur RDS Expired - Lifetime EP0503202B1 (fr)

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JP4326691A JPH04280510A (ja) 1991-03-08 1991-03-08 Ｒｄｓ受信機の制御方法
JP4326491A JPH04280508A (ja) 1991-03-08 1991-03-08 Ｒｄｓ受信機の制御方法
JP43266/91 1991-03-08
JP4326591A JP2965725B2 (ja) 1991-03-08 1991-03-08 Ｒｄｓ受信機の制御方法
JP43265/91 1991-03-08
JP43264/91 1991-03-08

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IT1268458B1 (it) * 1993-07-01 1997-03-04 Geymonat Associati S R L Scheda radio associabile ad un computer
JP3320915B2 (ja) * 1994-09-07 2002-09-03 パイオニア株式会社 ネットワークフォロー処理方法及びこれを実行するｒｄｓ受信機
JPH08256069A (ja) * 1995-03-16 1996-10-01 Sanyo Electric Co Ltd Ｆｍ多重放送受信回路及びそれを用いた受信機
JP4271087B2 (ja) * 2004-06-09 2009-06-03 三菱電機株式会社 受信装置
US9554319B2 (en) 2005-09-27 2017-01-24 Qualcomm Incorporated Channel handoff methods in wireless broadcast systems
US7706288B2 (en) 2005-09-27 2010-04-27 Qualcomm Incorporated RF channel switching in broadcast OFDM systems
KR20080010673A (ko) * 2006-07-27 2008-01-31 삼성전자주식회사 영상신호의 상태에 따른 채널 변경방법 및 이를 적용한영상 표시장치
EP2073391B1 (fr) 2007-12-21 2011-06-08 Fujitsu Ten Limited Procédé de fonctionnement syntoniseur pour détecter et répondre aux effets des situations de tunnel sur la réception radio par un récepteur radio embarqué
US8957769B2 (en) 2009-01-30 2015-02-17 Panasonic Automotive Systems Company Of America, Division Of Panasonic Corporation Of North America Method for driver personalization based on tunnel detection for a single-tuner system

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JP2647671B2 (ja) * 1988-02-05 1997-08-27 パイオニア株式会社 受信機
JPH03227131A (ja) * 1990-01-31 1991-10-08 Pioneer Electron Corp Ｒｄｓ受信機における受信周波数選択方法

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