EP0801476B1 - Méthode de réception et de l'évaluation des données RDS en provenance d'une pluralité d'émetteurs - Google Patents

Méthode de réception et de l'évaluation des données RDS en provenance d'une pluralité d'émetteurs Download PDF

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Publication number
EP0801476B1
EP0801476B1 EP97105768A EP97105768A EP0801476B1 EP 0801476 B1 EP0801476 B1 EP 0801476B1 EP 97105768 A EP97105768 A EP 97105768A EP 97105768 A EP97105768 A EP 97105768A EP 0801476 B1 EP0801476 B1 EP 0801476B1
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EP
European Patent Office
Prior art keywords
transmitter
receiver
rds
accordance
tuning
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
EP97105768A
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German (de)
English (en)
Other versions
EP0801476A2 (fr
EP0801476A3 (fr
Inventor
Klaus Bischof
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.)
Grundig AG
Original Assignee
Delphi Technologies Inc
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Publication date
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Publication of EP0801476A2 publication Critical patent/EP0801476A2/fr
Publication of EP0801476A3 publication Critical patent/EP0801476A3/fr
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Publication of EP0801476B1 publication Critical patent/EP0801476B1/fr
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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]

Definitions

  • the invention relates to a method for the reception and evaluation of RDS data streams of multiple transmitters, wherein in addition to the reception and playback of a first transmitter whose RDS data stream is evaluated and in addition the RDS data stream further transmitter is evaluated.
  • Radio receivers are known for receiving broadcasters which transmit an RDS data stream in addition to the audio signal.
  • radio receiver In a first radio receiver only a single receiver for the broadcast signal and a single decoder for the evaluation of the RDS data stream is present.
  • Such radio receivers are manufactured, inter alia, by the applicant and sold under the type designation WKC 7500 RDS.
  • reception of the program deteriorates to the originally set reception frequency, a different reception frequency is automatically set in the known radio receiver on which the set program is likewise to be received.
  • the alternative reception frequencies stored in a memory are checked as to whether a station with sufficient quality can be received on them.
  • the tuner of the radio receiver is tuned briefly from the original reception frequency to the alternative reception frequencies and the reception characteristics are detected. Then the tuner is tuned back to the original reception frequency. The interruption is so short that it is not audible in the reproduced audio signal. Likewise, the band can be examined for new channels out.
  • the tuner After checking the alternative reception frequencies, the tuner is tuned to the reception frequency for which the highest reception level was determined in order to obtain the program information (PI code) from the RDS data stream and to the program information of the program at the originally set reception frequency to compare. If a deviation is detected, tuner will be tuned again to the originally set reception frequency. This check is audible in the reproduced audio signal as it takes longer.
  • PI code program information
  • a search is necessary in which the reception band is scanned for a station with program information that matches that of the originally set station. Such a search stops playback of the audio signal for several seconds.
  • an RDS radio receiver with only one receiver in which disruptive interruptions of the reproduced audio signal due to an evaluation of the RDS data stream of another transmitter are avoided by a memory is used to buffer the signal to be played back the originally set station. Occur during the period of storage of the audio signal for which the memory is sized, larger pauses in the audio signal, can take place within the duration of the pause, a longer switchover without interference.
  • a disadvantage of the known RDS radio receiver is the fact that pauses with a period of time, as they are necessary for the evaluation of an RDS data stream, not very often occur in an audio signal, Therefore, the known RDS radio receiver with respect to the switching frequency of the original station is severely restricted to other stations.
  • radio receivers In a second known radio receiver there are two receivers for broadcast signals and two decoders for the evaluation of RDS data streams. Such radio receivers are manufactured for example by the company Becker and distribute under the type designation Mexico 2330th
  • One of the receivers and decoders is used to receive the originally set program, while the second receiver and the second decoder are used to constantly receive the other receivable stations and to evaluate the RDS data streams.
  • the data obtained by means of the second receiver and second decoder can be used, whereby the trouble-free reproduction of the originally selected program is guaranteed.
  • the cost of implementing the second known radio receiver is very high.
  • Out EP-A-0 497 116 is a radio receiver with a device for decoding radio data signals, which are divided into groups each having a predetermined number of bits, known, the groups containing a program identification code.
  • the radio receiver is equipped with means for switching from a received frequency to an alternative frequency. By transiently switching to the alternative frequency, multiple data samples from different groups and at different times within the groups of the radio data signal received at the alternative frequency are extracted. The data samples are then compared to a stored program identification code.
  • a method for detecting information in an RDS data stream is known, in which two receivers are used for the simultaneous reproduction of the originally set transmitter and for the continuous examination of other transmitters. So that the examination of the RDS data streams of the other, constantly examined stations can be done faster, the synchronization to the RDS data streams of other stations is performed only once in the known method. If the synchronization was carried out for the first time, a counter is started. In a later evaluation of one before evaluated RDS data stream synchronization can then be done by means of the counter immediately. In the known method, however, a longer time is required for the first-time synchronization process, which, however, is unproblematic when using two receivers.
  • the advantage of the method according to the invention is the fact that when using a radio receiver with a single receiver, the RDS data stream multiple stations can be evaluated, whereby the functionality and advantages of a radio receiver with two receivers can be realized at a significantly lower cost.
  • a broadcast receiver according to the concept of the above-described radio receiver having a single receiver and a single RDS decoder is used.
  • Essential for the applicability of the method according to the invention is that the present in the receiver of the radio receiver used phase-locked loop (PLL) has a short settling time to make the tuning process to the different receiving frequencies as quickly as possible.
  • PLL phase-locked loop
  • the RDS decoder used must also be taken into account. If the settling time of the RDS decoder used is too great, a second RDS decoder can be used, which is used only for decoding the RDS data stream of the other transmitters.
  • each block contains an information word and a test word, wherein the information word contains the data to be transmitted, while the test word contains error protection and synchronous information for each block.
  • Four blocks form a group.
  • the size and duration of the individual data elements of the RDS data stream can be seen in the following table.
  • data element Size in bits Duration in ms group 104 87.6 block 26 22
  • Information word 16 13.5
  • Test word 10 8.5
  • the four blocks of each group contain an offset word as synchronous information.
  • the offset words designate the blocks as A, B, C, and D.
  • the data contents of the block A always include the program information (PI) unchanged while the data contents of the blocks B, C, and D can change from group to group. This is important in the determination of the synchronous information and in the evaluation of the RDS data stream and will be explained in detail later.
  • the receiver For evaluating the RDS data streams of several transmitters of the radio receiver, which is tuned to a particular first station and reproduces the audio signal, briefly keyed to a second transmitter.
  • the receiver is tuned to the reception frequency of the second transmitter.
  • a synchronization information is obtained by means of the RDS decoder from the test words of the RDS data stream of the second transmitter, with a timer, z.
  • As a counter is synchronized.
  • the receiver is again tuned to the reception frequency of the first transmitter whose audio signal is reproduced.
  • the receiver can be timed to the receiving frequency of the second transmitter so that the program information can be evaluated from the RDS data stream of the second transmitter. After reading out the desired blocks or the receiver is tuned back to the reception frequency of the first station. In this way, the program information of all receivable stations can be detected and, if necessary, can be switched without audible interruption to another station with the same program content.
  • the program information in principle it is also possible to obtain all the other information contained in the RDS data stream.
  • the length of the gating interval results from the settling times of the phase locked loop for tuning to the second transmitter and the return to the first transmitter as well as from the settling time of the RDS decoder.
  • FIG. 1 shows the synchronization according to the invention on the RDS data stream of a second transmitter and the evaluation of the RDS data stream with a read-out time on the second transmitter which is greater than the duration of two blocks (44 ms).
  • the offset word C of the third block detected.
  • the timer is synchronized and started.
  • the receiver is then tuned back to the first station.
  • the receiver controlled by the timer, is tuned to the second transmitter again in good time so that all transients are terminated at the beginning of the first block of the second evaluated group 2) of the second transmitter's RDS data stream and the RDS signal Decoder can evaluate the information word of the first block, the correctness is confirmed by the recognition of the offset word A. Then the receiver is tuned back to the first station.
  • the synchronization according to the invention is shown on the RDS data stream of a second transmitter, with a read-out time on the second transmitter which is greater than or equal to the duration of one block (22 ms).
  • the recognition of the offset words by the RDS decoder is only possible if the complete information word and the associated test word are present together. If the gating time is on the order of the duration of a group, problems arise because the data content of the individual Blocks of different groups, except for the block A, which contains the program information, different.
  • the receiver within each group is tuned to the second transmitter for the predetermined gating time.
  • the timing of the keying are chosen so that the settling time is always ended when the position is reached in the same block at which the read-out time was ended in the last group received. Likewise, it is possible to select the keying so that the read times overlap slightly. In this way it is possible to assemble an RDS data stream having complete blocks.
  • the data obtained during the readout times are buffered, including a memory, for.
  • a shift register can be used, which has a size of 26 bits to store a complete block can. Because of the already mentioned differences in the data in the individual blocks of different groups, this composition can only lead to consistent results for block A.
  • the composition of block A is completed only after six groups.
  • the information word and a part of the test word of block A originate from group 5) and the missing part of the test word from group 6).
  • the above-described synchronization and further evaluation of the RDS data stream is possible, wherein the memory described for the composition of the RDS data is also used for the evaluation of the RDS data stream.
  • the receiver Between the Auftastungen on the second transmitter, the receiver, for playback of the audio signal, respectively tuned to the first station.
  • the synchronization according to the invention is shown on the RDS data stream of a second transmitter, with a gating time on the second transmitter which is less than the duration of one block (22 ms).
  • the RDS data stream of the second transmitter for the individual blocks is composed of different groups, as described for Figure 2.
  • a check can be made in the other groups in which block A is reassembled and evaluated. This can be prevented with sufficient certainty that a bit combination, which coincidentally corresponds to the block A, is used for synchronization.
  • the receiver Between the Auftastungen on the second transmitter, the receiver, for playback of the audio signal, respectively tuned to the first station.
  • either very short switching periods can be selected, ie less than the duration of a block of 22 ms, or times are used in which due to the signal characteristics of the reproduced audio signal of the first Transmitter, the audibility is low. These can be, for example, zero crossings of the audio signal or post-masking effects (psychoacoustics).
  • Another possibility is the interpolation of the audio signal to be reproduced, which can be done for example by means of an already existing digital signal processor, or a combination of the measures described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Radio Transmission System (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Claims (6)

  1. Procédé pour la réception et l'analyse de flux de données RDS en provenance de plusieurs émetteurs au moyen d'un seul récepteur, le récepteur étant syntonisé sur la réception et la retransmission d'un premier émetteur et analysant, au moyen d'un décodeur RDS, le flux de données RDS en provenance du premier émetteur et, au moyen d'un décodeur RDS supplémentaire, le flux de données RDS en provenance d'un émetteur supplémentaire, comportant les étapes suivantes :
    a) syntonisation de courte durée du récepteur sur l'un des émetteurs supplémentaires,
    b) détermination, au moyen du décodeur RDS supplémentaire, d'une information de synchronisation contenue dans le flux de données RDS de l'émetteur supplémentaire, et mise en marche d'un dispositif qui génère une cadence synchronisée à la cadence du flux de données RDS en provenance de l'émetteur supplémentaire, l'information de synchronisation étant l'un des mots de décalage de fréquence contenus dans le flux de données RDS et l'information de synchronisation étant configurée par une syntonisation de courte durée répétée du récepteur sur l'émetteur supplémentaire,
    c) syntonisation du récepteur sur le premier émetteur, et
    d) nouvelle syntonisation de courte durée du récepteur sur l'émetteur supplémentaire, sur lequel le récepteur était déjà syntonisé dans l'étape a), en tenant compte de la cadence générée selon l'étape b), pour recevoir et analyser des données RDS déterminées issues du flux de données RDS.
  2. Procédé selon la revendication 1, caractérisé en ce que la syntonisation de courte durée du récepteur sur l'émetteur supplémentaire selon l'étape a) est effectuée pendant une durée qui est choisie de telle sorte que le processus de commutation n'est sensiblement pas audible dans le signal audio retransmis, issu du premier émetteur.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la syntonisation de courte durée du récepteur sur l'émetteur supplémentaire selon l'étape a) est effectuée à un moment auquel le processus de commutation, compte tenu des propriétés du signal audio à retransmettre, issu du premier émetteur, n'est sensiblement pas audible, en particulier pendant le passage par zéro du signal audio.
  4. Par exemple selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, pendant la syntonisation de courte durée du récepteur sur l'émetteur supplémentaire selon l'étape a), le signal audio à retransmettre, issu du premier émetteur, est simulé par une évaluation de signal, en particulier par extrapolation.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les données RDS déterminées, reçues et analysées selon l'étape d), sont configurées par une syntonisation de courte durée répétée du récepteur sur l'émetteur supplémentaire, sur lequel le récepteur était déjà syntonisé pendant l'étape a), en tenant compte de la cadence générée selon l'étape b).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le procédé est utilisé dans une radio, en particulier une radio pour véhicules automobiles.
EP97105768A 1996-04-11 1997-04-08 Méthode de réception et de l'évaluation des données RDS en provenance d'une pluralité d'émetteurs Expired - Lifetime EP0801476B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19614322A DE19614322A1 (de) 1996-04-11 1996-04-11 Verfahren für den Empfang und die Auswertung von RDS-Datenströmen mehrerer Sender
DE19614322 1996-04-11

Publications (3)

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EP0801476A2 EP0801476A2 (fr) 1997-10-15
EP0801476A3 EP0801476A3 (fr) 2000-05-10
EP0801476B1 true EP0801476B1 (fr) 2007-06-13

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EP97105768A Expired - Lifetime EP0801476B1 (fr) 1996-04-11 1997-04-08 Méthode de réception et de l'évaluation des données RDS en provenance d'une pluralité d'émetteurs

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EP (1) EP0801476B1 (fr)
AT (1) ATE364939T1 (fr)
DE (2) DE19614322A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6560207B1 (en) * 1998-02-24 2003-05-06 Sanyo Electric Co., Ltd. Synchronous circuit of FM multiplex broadcasting receiver
GB9827108D0 (en) * 1998-12-10 1999-02-03 Ensigma Ltd Broadcast receivers
DE10132322A1 (de) * 2001-07-06 2003-01-30 Harman Becker Automotive Sys Verfahren zum Prüfen des Empfangs auf alternativen Empfangsfrequenzen bei einem Autobestrundfunkempfänger sowie Autobestrundfunkempfänger
DE102004041522A1 (de) * 2004-08-27 2006-03-02 Robert Bosch Gmbh Empfangsschaltung
DE102005039054A1 (de) * 2005-08-18 2007-02-22 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zum Extrahieren von Zieldaten aus einem Zieldatenstrom
EP2063558A1 (fr) * 2007-11-22 2009-05-27 Continental Automotive GmbH Procédé et terminal pour selectionner un signal audio

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659511A1 (fr) * 1990-03-09 1991-09-13 Portenseigne Radiotechnique Procede d'acquisition et de comparaison des donnees d'identification de deux canaux de transmission, et appareil recepteur correspondant.
DE4103062C2 (de) * 1991-02-01 1994-03-31 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4103061C2 (de) * 1991-02-01 1995-04-13 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4129830A1 (de) * 1991-09-07 1993-03-25 Blaupunkt Werke Gmbh Ukw-empfaenger mit mehreren antennen
DE4233758C1 (de) * 1992-10-07 1994-01-27 Blaupunkt Werke Gmbh Rundfunkempfänger
JP2841309B2 (ja) * 1992-11-13 1998-12-24 クラリオン株式会社 多重放送受信機
DE4338412C1 (de) * 1993-11-10 1995-03-02 Becker Gmbh Verfahren zur Detektion von Informationen im RDS-Datenstrom

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
DE19614322A1 (de) 1997-10-16
EP0801476A2 (fr) 1997-10-15
DE59712853D1 (de) 2007-07-26
EP0801476A3 (fr) 2000-05-10
ATE364939T1 (de) 2007-07-15

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