EP0433904B1 - Récepteur de radiodiffusion RDS pourvu d'un dispositif de réception préférentielle de programmes ayant le même indicatif national - Google Patents

Récepteur de radiodiffusion RDS pourvu d'un dispositif de réception préférentielle de programmes ayant le même indicatif national Download PDF

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Publication number
EP0433904B1
EP0433904B1 EP90124163A EP90124163A EP0433904B1 EP 0433904 B1 EP0433904 B1 EP 0433904B1 EP 90124163 A EP90124163 A EP 90124163A EP 90124163 A EP90124163 A EP 90124163A EP 0433904 B1 EP0433904 B1 EP 0433904B1
Authority
EP
European Patent Office
Prior art keywords
rds
reception
search
program
country
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
EP90124163A
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German (de)
English (en)
Other versions
EP0433904A3 (en
EP0433904A2 (fr
Inventor
Mathias Grundig E.M.V. Kalmer
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
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Publication of EP0433904A2 publication Critical patent/EP0433904A2/fr
Publication of EP0433904A3 publication Critical patent/EP0433904A3/de
Application granted granted Critical
Publication of EP0433904B1 publication Critical patent/EP0433904B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04H60/49—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 locations
    • H04H60/54—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 locations where broadcast information is generated
    • 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

  • a binary data stream is transmitted inaudibly for the radio listener parallel to the broadcast radio program, which provides the receiver with a range of tuning, switching and operating information.
  • so-called PI codes Program Identification Codes
  • AF codes Alternative Frequency Codes
  • TP code Traffic Program Code
  • TA code Traffic Announcement Code
  • a deterioration in the reception conditions, especially in the case of mobile radio reception, can be eliminated by the receiving device by switching to an alternative frequency at lightning speed, so that the radio receiver can follow the current program practically without interruption.
  • This rapid change to an alternate frequency naturally presupposes that at least one alternative frequency with sufficient reception quality is available. If this is not the case (either because there is no alternative frequency for a local broadcaster; or because the vehicle equipped with a car radio leaves a limited transmission area so that the alternative frequencies are no longer receivable), von Manually or automatically to search for a new program chain with sufficient reception quality. This is particularly important if you expect the latest traffic announcements while playing a music cassette or while the receiving device is waiting while the radio program is muted.
  • EFA 0 326 746 A2 suggests that the device user be warned of the loss of the program chain by means of a warning signal so that he can manually select another transmitter station.
  • this type of information was also common for car radios for the ARI system (driver broadcasting information), which is disclosed in the "Grundig Technical Information" 4 / 5-1980, page 255.
  • the present invention is therefore based on the object of creating an RDS radio receiver, in particular an RDS car radio, which, in the event of a deterioration in the reception conditions, initially only searches for stations with the same country code and only then accepts a program from the neighboring country when the search is started remains unsuccessful after a home station.
  • the station search can only be limited to traffic information stations or include all RDS stations.
  • the receiving device should optionally be programmable via a switch in such a way that, after an automatic search, it only transmits frequencies with the country code received before the search started RAM takes over.
  • the power amplifier of the device should be muted and the mute should only be deactivated when a program with sufficient reception quality is received again.
  • the PI code consists of a four-digit hexadecimal character string, each HEX number being binary coded with 4 bits, so that the PI code comprises a total of 16 bits (see Fig. 1).
  • the first HEX number (bits 1 to 4) contains the country code, ie it indicates the state sovereignty to which the transmitter is to be assigned.
  • the second HEX number (bits 5 to 8) defines the broadcast area, i.e. it differentiates between local, regional, supra-regional, national and international programs.
  • the third and fourth HEX numbers (bits 9 to 16) identify the various program groups that are allocated to the federal states.
  • the RDS radio receiver shown in FIG. 2 contains, in a manner known per se, 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 output stage 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 has high-frequency interference amplitudes in the multiplex signal, caused by multipath reception, evaluates.
  • 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 decoder 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 13 with several memory levels as working memory and additional memory.
  • the operating program is stored in the ROM memory 14.
  • the EEPROM memory 15 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) a number of selected alternative frequencies for one spontaneous program call.
  • the data contained in the respective memory level of the program memory 15 are transferred into the main memory (first memory level of the RAM memory 13) by the microprocessor 9 when a specific program is called up. Then the AFs are related by briefly tuning the receiver checked for field strength, multi-path reception, transmitter center, RDS transmission quality and PI code and sorted in order according to their reception quality. Finally, the tuner 1 is tuned by the microprocessor 9 to the frequency with the highest field strength.
  • the microprocessor 9 determines via the level detector 5 and the multipath detector 6 that the reception quality is no longer sufficient because the user of the mobile RDS receiver e.g. leaving the broadcasting area of a program chain or moving in the border area to neighboring nation states, it will initiate an automatic frequency change, as exemplified in the flow chart of FIG. 3.
  • program step 1 the set transmitter is continuously monitored for reception interference. If the reception quality drops below a certain minimum, the next-order AF of the AF list contained in the working memory (first memory level of the RAM memory 13) is removed by the microprocessor 9 in step 2 and checked in step 4 by briefly tuning the tuner 1 for reception worthiness. Before that, in step 3, the output stage 4 is muted by the microprocessor 9 via the electronic two-way switch 8.
  • the PI code is compared in step 5 with that of the previously set one Mother frequency. If the tests in steps 4 or 5 are negative, the program returns to step 2, that is, the next following AF is taken from the AF list contained in the working memory 13 and the test cycle is continued until an alternative frequency that is worth receiving is included exactly the same PI code is found. In this case, the ranking of the alternative frequencies in the AF list of the working memory 13 is reevaluated in step 6.
  • step 8 a search for RDS stations or for RDS traffic radio stations (depending on the device programming) is carried out via the entire reception frequency range started. A list of all the RDS stations found, sorted by PI code, is created in the second memory level of the RAM 13. Step 9 then checks whether RDS stations worth receiving have been found. If the result is negative, the search is repeated, returning to step 8; if the result is positive, the RDS stations found are evaluated with regard to their field strength and their country code and read from the station list. The check whether the country code of a reception frequency taken from the station list corresponds to the nationality of the station originally received is carried out in step 11.
  • step 12 is followed by program step 13, in which it is asked whether only RDS stations with identical country codes are permitted.
  • the question in program step 13 is decided by the position of the switch 10 symbolically represented in the block diagram, FIG. 2. If switch 10 is open (if the question in program step 13 is answered in the negative), then when the station list is read again, an RDS station with a different country code is also loaded from the microprocessor 9 into the main memory (first memory level of the RAM memory 13). If the switch 10 is closed, i.e. if only RDS stations with identical country codes are allowed, the program returns from step 13 to step 8, which triggers a new station search.
  • Program step 14 follows when step 6, 11 or 13 offers a new reception frequency for tuning tuner 1. This frequency is fixed together with the PI code as the new mother frequency in the main memory (first memory level of the RAM memory 13). As a result of program step 13, a new country code can also be defined as reference information for further station searches.
  • step 15 the muting of the final stage 4 is finally canceled via the switching device 8.
  • the program then returns to step 1 and initiates the same frequency change routine described above in the event of another reception disturbance.
  • the RDS receiving device in the event of deterioration in the reception quality with switch 10 open (synonymous with non-existent switch) initially only searches for RDS transmission frequencies which are broadcast with the same country code in the PI code. Only if the search is unsuccessful, even over the entire reception frequency range, is an RDS transmitter with a different country code accepted and recorded as a new mother transmitter in the working memory.
  • the output stage of the receiving device is muted until a program worth receiving is available again.
  • switch 10 When switch 10 is closed, the search for alternative frequencies is limited only to transmitting stations with the same country code, which will be welcomed by a radio listener who often moves with his mobile receiving device along the border to a foreign-language neighboring country. If the limit is exceeded, he must then at least temporarily open switch 10 to adapt the receiving device to a new country code.

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

Claims (3)

  1. Récepteur de radiodiffusion RDS, notamment autoradio RDS, comportant des éléments électroniques de réglage d'accord et de mémoire, un dispositif pour évaluer la qualité de réception et une unité de commande centrale, qui déclenche un cycle automatique de recherche d'émetteurs, dès que le programme actuellement reçu et les autres fréquences, qui lui sont associées, ne peuvent plus être reçus, caractérisé en ce que l'unité de commande centrale (9) évalue les indicatifs de pays, qui sont délivrés par le décodeur RDS (7) et sont contenus dans le code PI du signal de données RDS et, par comparaison à l'indicatif de pays du programme reçu avant le début du cycle de recherche, transfère uniquement des fréquences de réception RDS aptes à être reçues, avec le même indicatif de pays dans la mémoire de travail (13) et mémorise également des programmes du pays voisin, après une recherche infructueuse dans l'ensemble de la gamme des fréquences de réception.
  2. Récepteur de radiodiffusion RDS selon la revendication 1, caractérisé en ce que l'unité de commande centrale (9) est réalisée sous la forme d'un microprocesseur et est programmable en outre par l'intermédiaire d'un interrupteur mécanique ou électronique (10) de sorte que, dans le cas d'un cycle de recherche automatique, seuls sont sélectionnés des émetteurs possédant l'indicatif de pays reçu avant le début du cycle de recherche.
  3. Récepteur de radiodiffusion RDS selon la revendication 1 ou 2, caractérisé en ce que, pendant le cycle de recherche d'émetteurs, l'étage final (4) est rendu muet par l'unité de commande centrale (9) par l'intermédiaire d'un dispositif de commutation (8) et que ce réglage sur l'état muet est maintenu jusqu'à ce qu'un programme possédant une qualité de réception suffisante puisse être à nouveau reçu.
EP90124163A 1989-12-21 1990-12-14 Récepteur de radiodiffusion RDS pourvu d'un dispositif de réception préférentielle de programmes ayant le même indicatif national Expired - Lifetime EP0433904B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942339 1989-12-21
DE3942339A DE3942339A1 (de) 1989-12-21 1989-12-21 Rds-rundfunkempfaenger mit einer einrichtung zum vorzugsweisen empfang von programmen mit gleicher laenderkennung

Publications (3)

Publication Number Publication Date
EP0433904A2 EP0433904A2 (fr) 1991-06-26
EP0433904A3 EP0433904A3 (en) 1992-03-04
EP0433904B1 true EP0433904B1 (fr) 1994-11-02

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EP90124163A Expired - Lifetime EP0433904B1 (fr) 1989-12-21 1990-12-14 Récepteur de radiodiffusion RDS pourvu d'un dispositif de réception préférentielle de programmes ayant le même indicatif national

Country Status (3)

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EP (1) EP0433904B1 (fr)
AT (1) ATE113777T1 (fr)
DE (2) DE3942339A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206475C1 (fr) * 1992-03-02 1993-07-08 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
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
DE19638482A1 (de) * 1996-09-20 1998-04-02 Bosch Gmbh Robert Verfahren zur Auswahl einer Sendefrequenz
DE19723290A1 (de) * 1997-06-04 1998-12-10 Thomson Brandt Gmbh Verfahren zur Programmierung eines Fernsehempfängers
FR2792795B1 (fr) * 1999-04-20 2001-07-13 Sagem Systeme d'ecoute amplifiee et procede de telephonie mobile mains libres
EP1668875B1 (fr) * 2003-09-24 2009-01-21 Gn Netcom A/S Kit mains libres con u pour un telephone mobile
DE102012204090A1 (de) * 2012-03-15 2013-09-19 Bayerische Motoren Werke Aktiengesellschaft Radioempfänger mit automatischer Reaktion auf Funkempfangsstörungen
DE102014201602A1 (de) 2014-01-29 2015-07-30 Continental Automotive Gmbh System und Verfahren zur Erkennung geographischer Regionen für mobile Empfänger und Verfahren

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2666861B2 (ja) * 1986-12-19 1997-10-22 トムソン コンシューマー エレクトロニクス セイルズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 無線放送信号の中の付加的情報の伝送及び／又は受信側評価方法
GB8719944D0 (en) * 1987-08-24 1987-09-30 British Broadcasting Corp Radio data system receivers
JP2571247B2 (ja) * 1988-01-07 1997-01-16 パイオニア株式会社 ラジオデータ受信機における受信周波数選択方法
JP2647671B2 (ja) * 1988-02-05 1997-08-27 パイオニア株式会社 受信機
GB8806200D0 (en) * 1988-03-16 1988-04-13 British Broadcasting Corp Improvements to rds radio receivers

Also Published As

Publication number Publication date
DE3942339A1 (de) 1991-06-27
DE59007629D1 (de) 1994-12-08
ATE113777T1 (de) 1994-11-15
EP0433904A3 (en) 1992-03-04
DE3942339C2 (fr) 1993-09-23
EP0433904A2 (fr) 1991-06-26

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