EP0497116B1 - Récepteur de radiodiffusion avec RDS - Google Patents

Récepteur de radiodiffusion avec RDS Download PDF

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Publication number
EP0497116B1
EP0497116B1 EP92100371A EP92100371A EP0497116B1 EP 0497116 B1 EP0497116 B1 EP 0497116B1 EP 92100371 A EP92100371 A EP 92100371A EP 92100371 A EP92100371 A EP 92100371A EP 0497116 B1 EP0497116 B1 EP 0497116B1
Authority
EP
European Patent Office
Prior art keywords
frequency
microcomputer
broadcast receiver
receiver according
code
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.)
Expired - Lifetime
Application number
EP92100371A
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German (de)
English (en)
Other versions
EP0497116A2 (fr
EP0497116A3 (en
Inventor
Werner Henze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HENZE, WERNER
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Individual
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Filing date
Publication date
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Publication of EP0497116A2 publication Critical patent/EP0497116A2/fr
Publication of EP0497116A3 publication Critical patent/EP0497116A3/de
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Publication of EP0497116B1 publication Critical patent/EP0497116B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—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
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/37—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying segments of broadcast information, e.g. scenes or extracting programme ID

Definitions

  • the invention relates to a radio receiver with a device for decoding radio data signals according to the preamble of the main claim.
  • RDS receivers In known radio receivers with a device for decoding radio data signals - referred to below as RDS receivers - especially car radios, it is checked from time to time whether program identification codes - hereinafter referred to as PI codes - are being tested by a test person received alternative frequency correspond to that of the respectively received frequency. This allows you to automatically switch to alternative frequencies while maintaining the program received. In the known RDS receivers, this test takes a time of 150 ms to 300 ms, which leads to annoying crackling noises, because as long as no audio signal from the received frequency is available.
  • the object of the present invention is to enable an RDS receiver to test alternative frequencies for the presence of a program identification code in such a way that the reception of the station currently set is not impaired.
  • the radio receiver according to the invention with the characterizing features of the main claim has the advantage that, despite a low cost for only one receiving part and the good use of the antenna signal, it is possible to test the program identification code at alternative frequencies without the disturbances described above.
  • the interruptions in reception required for testing in the radio receiver according to the invention last about 20 ms to 30 ms and are not perceived as disturbing.
  • the total time of all interruptions required for testing in the radio receiver according to the invention can be greater than the interruption in the known radio receiver, but the short interruptions are distributed over the total time in such a way that they do not appear to be disruptive.
  • a further development of the invention consists in that data samples, which contain an RDS data bit sequence, are taken from different groups at corresponding times within the groups of the radio data signal. This takes advantage of the fact that the program identification code is present in each group of the radio data signal. If the data samples taken according to this development are different, then they are either not parts of the program identification code or there is a transmission error in at least one of the data samples. Another time-consuming test can thus be avoided.
  • all the bits belonging to the RDS signal can also be received and written into a microcomputer by staggering the switches appropriately over time.
  • the complete code including the check bits is then available for the evaluation.
  • many data samples are required.
  • the signal received by the antenna 1 is first fed to a selective pre-stage 2 and passes increasingly to the mixing stage 3.
  • the tuning is carried out with the aid of a frequency-phase control loop (PLL), which consists of a controllable oscillator 4, a programmable frequency divider 5, a frequency-phase comparator 6 and a low-pass filter 7.
  • a frequency-stable reference frequency is fed to the frequency-phase comparator 6 at 8.
  • the frequency of the controllable oscillator 4 can be predetermined via a control input 9 of the programmable frequency divider 5.
  • the selective pre-stage 2 is tuned with the control voltage supplied to the controllable oscillator 4.
  • the output signal of the mixer stage is passed via an IF amplifier 10 to the FM demodulator 11, at the output of which a multiplex signal (MPX) is available which, in addition to the audio information, contains the radio data signal.
  • MPX multiplex signal
  • the two audio signals L and R are generated in a stereo decoder 12 and are supplied to the loudspeakers 14, 15 via the NF stereo amplifier 13.
  • An RDS decoder 16 derives the radio data signal from the multiplex signal.
  • Microcomputer 17 To control the programmable frequency divider 5, that is to say to tune the receiver, to evaluate the radio data signal and for other functions Microcomputer 17 provided. This has two inputs 18, 19 for the radio data signal. At two outputs 20, 21 there is a divider ratio calculated by the microcomputer for the programmable frequency divider 5. Two switches 22, 23 which can be controlled in the same direction connect the input 9 of the programmable frequency divider 5 optionally to one of the outputs 20 or 21 and the output of the RDS decoder 16 to one of the inputs 18 or 19 of the microcomputer 17. The switches are practically connected to the microcomputer itself realized by software, so that only one input and one output is necessary.
  • Another output 24 of the microcomputer 17 carries a signal for controlling the changeover switches 22, 23. Furthermore, an output 25 of the microcomputer 17 is connected to a control input of the LF stereo amplifier 13 for the purpose of muting. Further outputs 26 and inputs 27 of the microcomputer are only indicated and are used, for example, to output the radio data to a display device or to enter operating information.
  • a program provided for the microcomputer controls, in particular the switching of the frequencies with respect to the times and the duration and the evaluation of the data samples described below.
  • the programmable frequency divider 5 is set by the microcomputer 17 in accordance with the GF.
  • the RDS decoder 16 supplies the radio data signal to the microcomputer via the input 18, which evaluates it in a suitable manner, for example for displaying data on a display device.
  • the microcomputer 17 switches the changeover switches 22, 23 to the right position (time t1 in FIG. 2).
  • the programmable frequency divider 5 is now set to the divider ratio for the alternative frequency AF via the output 21 and the changeover switch 22.
  • the PLL settles to the frequency AF up to the time t2. This is followed by bit synchronization in the RDS decoder 16, which lasts until time t3. From time t3, the RDS decoder 16 sends radio data signals to the microcomputer 17 via the changeover switch 23 and the input 19.
  • the microcomputer switches the changeover switch back to the left position, so that the programmable frequency divider 5 is set again to receive the frequency GF. After the setting time of the PLL has expired, the frequency GF is received again from time t5.
  • the largest element of the radio data is called group and consists of 104 bits with a frequency of 1187.5 bits are sent per second. Each group consists of four blocks, each with 26 bits. 16 bits belong to an information word and 10 bits to a check word. Further details on the radio data signal and its decoding are described, for example, in the publication Tech. 324-E "Specifications of the Radio Data System RDS for VHF / FM Sound Broadcasting", March 1964, published by the Technical Center of the European Broadcasting Union, Brussels.
  • a test can already be started to determine whether the data sample corresponds to a part of the PI code of the frequency GF (condition 2).
  • condition 2 Both conditions must be met before the data sample can be used again. If one of the two conditions is not met, the reading period for the following data sample is shifted by one data bit (842.1 ⁇ s) or a multiple thereof to one side after each data sample, based on the temporal position of the first data sample. Because of the quicker verifiability and because the fulfillment of condition 2 occurs more frequently in immediate succession the data sample is used for this purpose, i.e. condition 2 should be met first.
  • the size of the offset of the reading period depends on the number of bits of the data sample read and is continued until condition 2 is fulfilled or a predetermined time limit is reached. If the test is ended without fulfilling condition 2, the PI code in the frequency AF does not match that in the frequency GF. However, if condition 2 is found to be fulfilled, a check is made to determine whether condition 1 is also fulfilled. However, since a complete block of the radio data signal is not received, the error determination and error correction provided per se when decoding the radio data signal cannot be used. Therefore, within the scope of the invention, condition 1 is checked until sufficient security exists and the data sample can be used further.
  • test intervals can also be an integer multiple of the transmission duration of a group.
  • condition 2 If conditions 1 and 2 can be regarded as fulfilled with sufficient certainty, it is certain that part of the PI code corresponds in frequency GF to the data sample. It must now be checked whether the rest of the code to which the data sample belongs also corresponds to the rest of the PI code of frequency GF. The coincidence found so far already shows how many bits have to be checked before and after the data sample. To check the remaining bits, the number and the temporal position of the data samples still required in each case are therefore calculated, the changeover switches 22, 23 (FIG. 1) are converted accordingly by the microcomputer 17 and then a comparison of the received data samples with the stored PI code (condition 2). If this condition and condition 1 above are not met for one of the other data samples, this check is ended and a new check is started after a bit offset. Only when conditions 1 and 2 are met for all additional data samples, does the statement apply that the PI code of the alternative frequency AF corresponds to that of the frequency GF.
  • an additional mixer stage 31 an additional frequency-phase control loop 32, an additional intermediate frequency amplifier 33 and an additional frequency demodulator 34 are provided, so that the receiver of of the respectively received frequency GF can be set to an alternative frequency AF without new settling of the frequency-phase control circuit 30 (4 to 9 in FIG. 1).
  • Only the selective preamplifier 35 is switched to the alternative frequency AF, but this is possible very quickly.
  • the selective preamplifier 35 receives a control voltage either from the frequency-phase control loop 30 or via a digital / analog converter 38 from the microcomputer 17 depending on the position of a switch controllable by the microcomputer 17.
  • the RDS decoder 16 is switched to the second frequency demodulator 34 with the aid of a switch 37. Both frequency-phase control loops 30, 32 are each supplied with a setpoint by the microcomputer 17.
  • FIG. 3 shows the temporal processes when receiving a data sample with the receiver according to FIG. 4.
  • the transition from the frequency GF to the frequency AF and vice versa takes place in a much shorter time than with the receiver after Fig. 1.
  • a much longer time is available for the reception of the data sample from the signal with the frequency AF, which is readily apparent from Fig. 3.
  • the clock frequency is very precise both in the radio transmitters which emit radio data signals and in the radio receivers, it is also possible within the scope of the invention to include the entire duration of the trial reception, possibly even several such periods of time for the bit synchronization use.
  • the bit clock can then be derived from an internal clock with the aid of a frequency-phase control loop or with the aid of the microcomputer and can be kept in accordance with the synchronization that has taken place.
  • the next time the alternative frequency AF is switched over the entire reception duration of the alternative frequency is then available for reading the data sample.
  • Receiving a data sample which is only carried out for the purpose of bit synchronization, can take place at suitable times or at suitable time intervals, the duration of a group need not be observed.
  • identifiers can be checked in a simple manner when the frequency GF is received without interference. Since the time position of the PI code and thus the entire RDS time grid of the alternative frequency AF is known from the checking of the PI code, the TP and TA bit can be read specifically by the microcomputer. For security reasons, the corresponding bits should also be read several times here. It is also advantageous to check the bit synchronization sufficiently often after recognizing the PI code in the alternative frequency AF and to track it if necessary.

Claims (10)

  1. Récepteur radio comportant un dispositif de décodage de signaux de données radio (décodeur RDS 16) qui sont subdivisés en groupes avec chacun un nombre prédéterminé de bits et qui contiennent un code d'identification de programme (PI), et comportant un dispositif pour passer d'une fréquence reçue (GF) à une fréquence de substitution (AF) le dispositif de passage comprenant un microcontrôleur (µC17), caractérisé en ce que
    - de manière pilotée par le microcontrôleur (17), de brefs passages à la fréquence de substitution (AF) sont opérés pour la durée d'un fraction d'un bloc du signal de données radio,
    - une synchronisation par bits a lieu dans le décodeur RDS (16),
    - plusieurs échantillons de données sont prélevés de différents groupes et à différents instants (au cours de différents passages à une fréquence de substitution (AF)) à l'intérieur des groupes du signal de données radio,
    - dans le microcontrôleur (17) est testé si la séquence de bits obtenue à partir du premier échantillon de données et des échantillons suivants est contenue dans le code PI enregistré, et
    - en ce que de manière pilotée par le microcontrôleur (17), le cas échéant, d'autres prélèvements d'échantillons de données décalés dans le temps ont lieu jusqu'à vérification du code PI, jusqu'à ce que ou bien une coïncidence soit établie entre le code PI de la fréquence recherchée et de la fréquence de substitution (AF), ou bien au contraire une limite de temps prédéterminée est dépassée.
  2. Récepteur radio selon la revendication 1, caractérisé en ce que le signal d'horloge obtenu par la synchronisation par bits est conservé dans le récepteur radio et poursuivi pendant le prélèvement des échantillons de données.
  3. Récepteur radio selon la revendication 1, caractérisé en ce qu'avant le prélèvement d'autres échantillons de données à des instants différents à l'intérieur des groupes, au moins un échantillon de données est prélevé au même instant à l'intérieur d'un autre groupe et en ce qu'une nouvelle recherche commence en cas de divergence entre le premier échantillon de données et l'échantillon de données de l'autre groupe.
  4. Récepteur radio selon l'une des revendications précédentes, caractérisé en ce que les passages à la fréquence de substitution durent de 20 ms à 30 ms.
  5. Récepteur radio selon l'une des revendications précédentes, caractérisé en ce que le code d'identification de programme enregistré est dans chaque cas celui de la fréquence reçue (GF).
  6. Récepteur radio selon l'une des revendications précédentes, caractérisé en ce que le code d'identification de programme enregistré peut être introduit indépendamment de la fréquence respectivement reçue.
  7. Récepteur radio selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en cas de coïncidence du code d'identification de programme dans la fréquence de substitution avec le code d'identification de programme enregistré, de brefs passages à la fréquence de substitution ont lieu en des instants auxquels des informations prédéterminées, en particulier des informations radio sur le trafic, sont contenues dans le signal de données radio de la fréquence de substitution.
  8. Récepteur radio selon l'une des revendications précédentes, caractérisé en ce que le microcontrôleur (17) est relié avec l'entrée de pilotage d'un diviseur de fréquence programmable (5) d'une boucle d'asservissement fréquence-phase, et en ce que la sortie d'un décodeur RDS (16) peut être reliée, de préférence par l'intermédiaire d'un commutateur pilotable (23), au choix avec l'une de deux entrées du microcontrôleur (17).
  9. Récepteur radio selon l'une des revendications précédentes comprenant un étage de mélange, un amplificateur de fréquence intermédiaire, une boucle de régulation fréquence-phase et un démodulateur FM, caractérisé en ce qu'il est prévu additionnellement, pour la réception de la fréquence de substitution, un autre étage de mélange (31), un autre amplificateur de fréquence intermédiaire (33), une autre boucle de régulation fréquence-phase (32) et un autre démodulateur FM (34), en ce que les boucles de régulation fréquence-phase (30, 32) et un étage d'entrée sélectif (35) peuvent être accordés à l'aide du microcontrôleur (17), en ce que de manière pilotée par le microcontrôleur (17) au choix le signal de sortie du démodulateur FM (11) ou de l'autre démodulateur FM (34) peut être envoyé à un décodeur RDS (16), et en ce que la sortie du décodeur RDS (16) peut être raccordées de préférence par l'intermédiaire d'un commutateur pilotable (23), au choix avec l'une de deux entrées du microcontrôleur (17).
  10. Récepteur radio selon l'une des revendications précédentes, caractérisé en ce qu'il y a passage à une réception durable de la fréquence de substitution, lorsque le code d'identification de programme reçu avec la fréquence de substitution coïncide avec le code d'identification de programme enregistré.
EP92100371A 1991-02-01 1992-01-11 Récepteur de radiodiffusion avec RDS Expired - Lifetime EP0497116B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4103062 1991-02-01
DE4103062A DE4103062C2 (de) 1991-02-01 1991-02-01 Rundfunkempfänger

Publications (3)

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EP0497116A2 EP0497116A2 (fr) 1992-08-05
EP0497116A3 EP0497116A3 (en) 1993-05-05
EP0497116B1 true EP0497116B1 (fr) 1996-11-27

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US (1) US5404588A (fr)
EP (1) EP0497116B1 (fr)
JP (1) JP3187108B2 (fr)
DE (2) DE4103062C2 (fr)

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EP0364749A2 (fr) * 1988-10-21 1990-04-25 Blaupunkt-Werke GmbH Récepteur radio
EP0399355A2 (fr) * 1989-05-26 1990-11-28 Blaupunkt-Werke GmbH Récepteur de radiodiffusion
EP0459360A2 (fr) * 1990-06-01 1991-12-04 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Récepteur radio avec RDS muni d'un dispositif pour la recherche de fréquences alternatives recevables en temps réel

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Publication number Publication date
DE4103062C2 (de) 1994-03-31
JP3187108B2 (ja) 2001-07-11
JPH0548397A (ja) 1993-02-26
US5404588A (en) 1995-04-04
EP0497116A2 (fr) 1992-08-05
DE4103062A1 (de) 1992-08-06
EP0497116A3 (en) 1993-05-05
DE59207560D1 (de) 1997-01-09

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