EP0443501A2 - 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
EP0443501A2
EP0443501A2 EP91102296A EP91102296A EP0443501A2 EP 0443501 A2 EP0443501 A2 EP 0443501A2 EP 91102296 A EP91102296 A EP 91102296A EP 91102296 A EP91102296 A EP 91102296A EP 0443501 A2 EP0443501 A2 EP 0443501A2
Authority
EP
European Patent Office
Prior art keywords
rds
frequency
frequencies
code
memory
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.)
Granted
Application number
EP91102296A
Other languages
German (de)
English (en)
Other versions
EP0443501B1 (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
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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
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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
    • 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 station for the first time by manual tuning or by station search, it can take a long time until a list of alternative frequencies assigned to the currently received frequency is stored, 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 38 35 870 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 include all the actually existing alternative frequencies in the program chain, are then supplemented by the AFs additionally contained in the RDS data signal.
  • the object of the present invention was to provide an RDS radio receiver, in particular an RDS car radio, with a device which, after a manually triggered RDS station search, supplements the RDS reception frequency transferred into the working memory with those alternative frequencies which are in a or more program memories of the Receiving device are stored with previous confirmation of their worthiness of receipt.
  • 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 working memory, and if they match, the alternative frequencies are transferred directly to the dynamic AF list of the working memory.
  • the advantage of this arrangement is that the AF lists that have grown empirically in the program memories over a longer period of time are immediately available and, if a frequency change is necessary, there is a probability that one or more alternative frequencies are also worth receiving. This is particularly useful if the transmission of the alternative frequencies in the RDS data signal is disturbed at the reception frequency found in the search.
  • the RDS radio receiver shown in FIG. 1 contains a synthesizer tuner 1, an IF amplifier 2 for the selective amplification and demodulation of 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 multipath 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 longer 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 of the alternative frequencies offered with the RDS data signal, but rather 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 station worth receiving in step 3, evaluating the signals from the level detector 5 and possibly additionally from the multipath 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 7. If not, he continues this test via step 8 until the time t has exceeded the value t 1. In this case, the program returns to step 2, i.e. tuner 1 is further tuned.
  • step 7 If T1 RDS signals are decoded within the time, the microprocessor 9 checks in step 7 whether a valid PI code is recognized. This test, which also pays attention to the correct decoding of the TP bit (Traffic Program Bit) in a special search for RDS traffic radio stations, is continued up to a maximum of time t2; then the program feeds back to step 2 via step 8.
  • TP bit Traffic Program Bit
  • step 10 If 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.
  • step 11 he 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) 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 expiry 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 rating of the alternative frequencies in the working memory 12 is updated and that alternative frequencies that 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. For this reason, 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)
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 true EP0443501A2 (fr) 1991-08-28
EP0443501A3 EP0443501A3 (en) 1992-04-22
EP0443501B1 EP0443501B1 (fr) 1996-06-12

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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)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552442A2 (fr) * 1991-11-28 1993-07-28 Kabushiki Kaisha Kenwood Récepteur pour système RDS
US5961126A (en) * 1996-07-02 1999-10-05 Ishikawa Gasket Co., Ltd. Metal gasket with peripheral bead

Families Citing this family (1)

* 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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305172A2 (fr) 1987-08-24 1989-03-01 British Broadcasting Corporation Récepteur pour RDS
DE3835870C1 (fr) 1988-10-21 1990-01-18 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De

Family Cites Families (4)

* 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
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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0305172A2 (fr) 1987-08-24 1989-03-01 British Broadcasting Corporation Récepteur pour RDS
DE3835870C1 (fr) 1988-10-21 1990-01-18 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552442A2 (fr) * 1991-11-28 1993-07-28 Kabushiki Kaisha Kenwood Récepteur pour système RDS
EP0552442A3 (fr) * 1991-11-28 1995-03-22 Kenwood Corp
US5961126A (en) * 1996-07-02 1999-10-05 Ishikawa Gasket Co., Ltd. Metal gasket with peripheral bead

Also Published As

Publication number Publication date
DE4005413A1 (de) 1991-08-22
DE59107910D1 (de) 1996-07-18
EP0443501B1 (fr) 1996-06-12
DE4005413C2 (de) 1993-12-16
EP0443501A3 (en) 1992-04-22

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