EP0443501B1 - Récepteur de radiodiffusion avec RDS muni d'un dispositif de recherche accélérée de fréquences alternatives - Google Patents

Récepteur de radiodiffusion avec RDS muni d'un dispositif de recherche accélérée de fréquences alternatives Download PDF

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Publication number
EP0443501B1
EP0443501B1 EP91102296A EP91102296A EP0443501B1 EP 0443501 B1 EP0443501 B1 EP 0443501B1 EP 91102296 A EP91102296 A EP 91102296A EP 91102296 A EP91102296 A EP 91102296A EP 0443501 B1 EP0443501 B1 EP 0443501B1
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EP
European Patent Office
Prior art keywords
rds
frequency
program
frequencies
control unit
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
EP91102296A
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German (de)
English (en)
Other versions
EP0443501A2 (fr
EP0443501A3 (en
Inventor
Dieter Grundig E.M.V. El. Mech. Versuchs. Nohse
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 EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Publication date
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Publication of EP0443501A2 publication Critical patent/EP0443501A2/fr
Publication of EP0443501A3 publication Critical patent/EP0443501A3/de
Application granted granted Critical
Publication of EP0443501B1 publication Critical patent/EP0443501B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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]

Definitions

  • RDS radio data system
  • PI codes Program Identification Codes
  • the radio receiver is tuned to an RDS transmitter for the first time by manual tuning or by station search, it may take a long time until a list of alternative frequencies assigned to the currently received frequency is saved, since if reception of the RDS data is disturbed u. A multiple run of the AF lists may have to be waited until the decoding is unambiguous.
  • EN 50 067 not only waits for the AF list assigned to the currently received frequency, but also for the AF lists that are assigned to other transmission towers in the transmitter chain to ensure that the currently received frequency appears as AF of a different mother frequency. In this case, this mother frequency should be saved as an alternative frequency of the current reception frequency.
  • DE-PS 3 835 870 describes a method according to which, on the one hand, the decodable PI codes and, on the other hand, the receivable RDS frequencies with respective assignment to the corresponding PI codes are stored during an automatic or manually started station search.
  • the resulting AF lists which may be due to the reception conditions at the location of the recipient. May not contain all the actually existing alternative frequencies in the program chain, are then supplemented by the AFs additionally contained in the RDS data signal.
  • an RDS radio receiver is known from EP-A-0 305 172, in which the same program key is assigned different programs for the user-controlled implementation of the program change, possibly with multiple key presses.
  • the subject of EP-A-0 305 172 provides a complex 2-memory concept for PI code or AF lists.
  • the PI code is read into the program memories in the 2-memory concept known from EP-A-0 305 172 in read-only memories R01 to R04 and the AF lists in read-write memories RW1 to RW4.
  • the write-in process takes a relatively long time, since the entire reception frequency range is scanned and the RDS data received via wave propagation are evaluated to identify the PI code.
  • Program-related alternative frequencies in the form of lists in the RDS signal are emitted by the individual transmitter stations.
  • EP-A-0 305 172 discloses that the receiving RDS radio stores the transmitted lists and selects them according to the currently received frequency, and that an alternative frequency is finally selected which offers the best possible reception.
  • the associated AF list is loaded into a working memory that is also built according to the 2-memory concept, depending on the Pl code.
  • the invention is based on the object of further developing an RDS radio receiver in accordance with EP-A-0 305 172 in such a way that an accelerated construction of the AF lists in the device's memory can be carried out taking into account the reception quality of the alternative frequencies in a specific reception area.
  • This object is achieved in that the PI codes of the RDS frequencies present in the program memories are compared with the PI code of the RDS reception frequency currently adopted in the separate working memory and that, if they match, the associated frequencies as alternative frequencies directly into the dynamic one AF list of the working memory are transmitted.
  • the RDS radio receiver shown in FIG. 1 contains a synthesizer tuner 1, an IF amplifier 2 for selectively amplifying and demodulating the intermediate frequency, a stereo decoder 3 for decoding the stereo multiplex signal and a stereo power amplifier in a manner known per se 4.
  • the reception quality is monitored with the level detector 5 and the multi-path detector 6.
  • the level detector 5 takes a measured variable from the IF amplifier 2 in accordance with the IF signal level to determine the signal field strength, while the multipath detector 6 evaluates high-frequency interference amplitudes in the multiplex signal caused by multipath reception.
  • the analog / digital conversion of the control signals for the microprocessor 9 takes place either in the two detectors 5, 6 or in the microprocessor 9, provided that it is provided with corresponding converter inputs.
  • the RDS demodulator 7 is also fed with the demodulated multiplex signal. After a 57 kHz bandpass filtering, the quadrature-amplitude-modulated RDS signal is demodulated and the digital data obtained after a subsequent biphase and differential decoding are fed to the microprocessor 9 for further processing.
  • the microprocessor 9 has the RAM memory 12 as the main memory.
  • the operating program is stored in the ROM memory 13.
  • the EEPROM memory 14 serves as a non-volatile program memory and contains in its individual memory levels for each stored program in addition to the PI code and the PS code (Program Service Name Code) for displaying the name of a program chain in the display 10) a number of selected alternative frequencies for a spontaneous program call.
  • the AF lists of this program memory 14 are built up empirically over a long period of time, because whenever the PI code of a frequency in the working memory 12 that has been checked for reception quality matches the PI code of a program memory, this frequency is a proven AF from the microprocessor 9 in FIG associated program memory is automatically transferred.
  • the program memories do not contain all the alternative frequencies offered with the RDS data signal, but only a limited selection which is important for the device user in view of his usual travel route. The access time when changing to an alternative frequency worth receiving is significantly reduced by this measure.
  • the microprocessor 9 will initiate a tuning and storage process, as exemplified in the flow chart according to FIG. 2.
  • step 1 After the start of the RDS station search, it is checked in program step 1 whether a frequency change lock is activated, since in this case no search command is accepted by the microprocessor 9 and the program is ended immediately. If the change lock is not active, the output stage 4 is muted in step 2 via the electronic switch 8 and the tuner 1 is tuned by the microprocessor 9 step by step. If the microprocessor 9 detects a transmitter worth receiving in step 3, evaluating the signals from the level detector 5 and possibly also from the multi-path detector 6, it first stops the search run and initializes a counter for the time t. In program step 5, the microprocessor 9 checks whether it receives 7 RDS signals via the RDS demodulator. If not, he continues this check via step 6 until the time t has exceeded the value t 1 . In this case the program returns to step 2, ie the tuner 1 is further tuned.
  • step 7 If RDS signals are decoded within the time t 1 , the microprocessor 9 checks in step 7 whether a valid PI code is recognized. This check, which also pays attention to the correct decoding of the TP bit (Traffic Program Bit) during a special search for RDS traffic radio stations, is continued at most until time t 2 ; then the program feeds back to step 2 via step 8.
  • TP bit Traffic Program Bit
  • the microprocessor 9 detects an error-free PI code, it takes over the relevant RDS or RDS-TP frequency in the working memory 12 in step 9 and removes the muting of the output stage 4.
  • program step 10 he activates a change lock so as not to receive any further search commands from the control unit 11 and sets a timer for the expiry time t ws to zero. He then compares the PI code of the frequency loaded into the working memory 12 with the PI codes of the frequencies contained in the program memories 14 (or equivalent additional memories) in step 11 and, if they match in step 12, transmits the frequencies of the corresponding program memory level as alternative frequencies in the main memory 12. Program step 13 leads back to step 11 as long as the expiration time t ws for the change lock has not reached the value t 3 . Only then is the exchange lock released in step 14 and the program run ended.
  • the quality evaluation of the alternative frequencies in the working memory 12 is updated with each frequency change due to deteriorating reception conditions and that alternative frequencies which are determined from the RDS data stream via wave propagation are subordinate in the evaluation sequence or, if no AFs could be taken over from the program memory 14, they are stored as the sole alternative frequencies.
  • the list of alternative frequencies in the working memory 12 can be referred to as a dynamic AF list.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (3)

  1. Récepteur radio RDS (système de transmission de signaux radio) pour l'accès spontané à différents programmes de diffusion, comportant un syntoniseur (1), un dispositif (5,6) pour évaluer la qualité de réception, une mémoire de programmes (14) pour mémoriser des codes PI (codes d'identification de programme) et des fréquences alternatives, une mémoire de travail (12) et une unité de commande centrale (9),
    caractérisé en ce que différents plans de la mémoire de programme (14) contiennent respectivement uniquement des fréquences alternatives qui, en raison d'opérations antérieures d'accès et après contrôle de la qualité de réception, ont été mémorisées par l'unité de commande centrale (9), que sur la base d'une instruction de démarrage pour une recherche automatique d'une quelconque fréquence d'émission RDS, apte à être reçue, l'unité de commande centrale (9) accorde pas-à-pas le syntoniseur (1) jusqu'à ce qu'un émetteur correspondant soit trouvé, que l'unité de commande centrale (9) mémorise la fréquence de réception associée et le code PI dans la mémoire de travail (12) et compare ce code PI aux codes PI des fréquences de réception contenues dans les plans (14) de la mémoire de programme, et que dans le cas d'une éventuelle coïncidence des codes PI, l'unité de commandé centrale (9) transmet les fréquences de réception respectives provenant du plan considéré (14) de la mémoire de programme, directement en tant que fréquences alternatives du programme actuellement reçu, dans la mémoire de travail (12), sans attendre l'évaluation des données, transmises par l'intermédiaire d'une propagation d'ondes sous la forme de listes de fréquences, de fréquences alternatives.
  2. Récepteur radio RDS selon la revendication 1, caractérisé en ce que l'unité de commande centrale (9) est agencée sous la forme d'un microprocesseur, qui transmet la fréquence de réception, trouvée lors d'une recherche d'émetteurs RDS déclenchée manuellement, au moyen d'un réglage d'accord pas-à-pas du syntoniseur (1), avec une qualité de réception suffisante, à la mémoire de travail (12), et arrête la poursuite de la recherche, uniquement lorsque des signaux RDS sont décodés pendant un premier intervalle de temps (t1) et qu'un code PI exempt d'erreur est identifié pendant un second intervalle de temps (t2).
  3. Récepteur radio RDS selon l'une des revendications précédentes, caractérisé en ce qu'après la réception d'une nouvelle fréquence de réception RDS dans la mémoire de travail (12), un blocage de changement est établi pendant une durée (t3), pendant laquelle aucune nouvelle instruction de recherche n'est reçue par le microprocesseur (9), de sorte que le code PI possédant la fréquence actuellement enregistrée dans la mémoire de travail (12) peut être comparé aux codes PI des fréquences mémorisées dans les plans (14) de la mémoire de programme.
EP91102296A 1990-02-21 1991-02-19 Récepteur de radiodiffusion avec RDS muni d'un dispositif de recherche accélérée de fréquences alternatives Expired - Lifetime EP0443501B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4005413 1990-02-21
DE4005413A DE4005413C2 (de) 1990-02-21 1990-02-21 RDS-Rundfunkempfänger mit einer Einrichtung zum beschleunigten Auffinden alternativer Frequenzen

Publications (3)

Publication Number Publication Date
EP0443501A2 EP0443501A2 (fr) 1991-08-28
EP0443501A3 EP0443501A3 (en) 1992-04-22
EP0443501B1 true EP0443501B1 (fr) 1996-06-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102296A Expired - Lifetime EP0443501B1 (fr) 1990-02-21 1991-02-19 Récepteur de radiodiffusion avec RDS muni d'un dispositif de recherche accélérée de fréquences alternatives

Country Status (2)

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EP (1) EP0443501B1 (fr)
DE (2) DE4005413C2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4137000C2 (de) * 1991-11-11 1994-06-09 Opel Adam Ag Verfahren zur feldstärkeabhängigen Auswertung von Rundfunkinformationen für Fahrzeuge
JP2558653Y2 (ja) * 1991-11-28 1997-12-24 株式会社ケンウッド Ｒｄｓ受信機
JP2936395B2 (ja) * 1996-07-02 1999-08-23 石川ガスケット株式会社 シリンダヘッドガスケット

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3448043C2 (de) * 1984-09-07 1987-01-15 Institut für Rundfunktechnik GmbH, 8000 München Verfahren zum Übertragen und Verarbeiten einer in einem Rundfunksignal enthaltenen digitalen Information
GB8719944D0 (en) * 1987-08-24 1987-09-30 British Broadcasting Corp Radio data system receivers
DE3737535C1 (de) * 1987-11-05 1989-05-18 Blaupunkt Werke Gmbh Empfaenger fuer das Radio-Daten-System
DE3825812A1 (de) * 1988-07-29 1990-02-01 Metz Werke Gmbh & Co Kg Hochfrequenzempfaenger mit einer einrichtung zur anzeige der programmkennung von sendeanstalten
DE3835870C1 (fr) * 1988-10-21 1990-01-18 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
JPH082030B2 (ja) * 1990-01-31 1996-01-10 パイオニア株式会社 Ｒｄｓプリセット受信機

Also Published As

Publication number Publication date
DE4005413A1 (de) 1991-08-22
EP0443501A2 (fr) 1991-08-28
DE59107910D1 (de) 1996-07-18
DE4005413C2 (de) 1993-12-16
EP0443501A3 (en) 1992-04-22

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