EP0445885B1 - Récepteur avec des moyens d'acquisition et de comparaison des données d'identification de deux canaux de transmission - Google Patents

Récepteur avec des moyens d'acquisition et de comparaison des données d'identification de deux canaux de transmission Download PDF

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Publication number
EP0445885B1
EP0445885B1 EP91200457A EP91200457A EP0445885B1 EP 0445885 B1 EP0445885 B1 EP 0445885B1 EP 91200457 A EP91200457 A EP 91200457A EP 91200457 A EP91200457 A EP 91200457A EP 0445885 B1 EP0445885 B1 EP 0445885B1
Authority
EP
European Patent Office
Prior art keywords
channel
bits
alternative
period
receiver
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
EP91200457A
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German (de)
English (en)
French (fr)
Other versions
EP0445885A1 (fr
Inventor
Françoise Verron
Serge Verron
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.)
Philips Electronique Gran Public
Koninklijke Philips NV
Original Assignee
Philips Electronique Gran Public
Koninklijke Philips Electronics NV
Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Electronique Gran Public, Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Philips Electronique Gran Public
Publication of EP0445885A1 publication Critical patent/EP0445885A1/fr
Application granted granted Critical
Publication of EP0445885B1 publication Critical patent/EP0445885B1/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

  • the present invention relates to a radio receiver with means for acquiring binary signals, and for comparing between the binary signals of a first channel called the current channel and of a second channel called the alternative channel, the signals of at least the current channel comprising a repetitive group of N binary data (N positive integer) comprising in particular its own coded identification and at least one tuning indication for searching for an alternative channel.
  • N binary data
  • An example of such a channel is known from the publication "European Broadcasting Union (EBU) techn. 3244 - E page 11", which defines the RDS system. This publication is included here by reference.
  • the RDS system is designed so that the car radio of a moving listener can automatically and permanently tune in to the best transmitter transmitting the program chosen by the listener.
  • the installation of the RDS system is neither universal, nor compulsory, nor of course immediate so that the manufacturer of a car radio intended for RDS must take into account the fact that there are a multitude of transmitters of which some only are equipped, on transmission, with the RDS system.
  • the invention applies, of course, only if the current transmitter transmits according to the RDS system, that is to say with a program identification code (PI code as indicated on page 12 of the document " EBU "cited), and with at least one indication of alternative frequency (AF code in an OA type group as indicated on page 16 of the document” EBU "cited).
  • PI code program identification code
  • AF code in an OA type group as indicated on page 16 of the document
  • the invention aims to carry out an identity check prior to a change in tuning, this checking taking place while the listener listens to the current program, and without interfering with it.
  • the object of the present invention is to eliminate this drawback.
  • the duration d2 corresponds to the duration of the transmission of either 104 + n.104 bits or 58 + m.104bits ('n' and 'm' positive or zero integers).
  • the bits acquired during two successive time slots d1 are concatenable and the chances of acquiring the 16 identification bits with a number of interruptions less than 5 (5x23> 104) increase.
  • the decoder comprises test means for testing an identification code of another program than the one being heard, and that a connection is provided between the decoder and the controller for, as the case may be, activating or not the means for testing the decoder identification code and a connection for indicating or not the equal identification codes for the current program and the alternative program.
  • Figure 1 shows the diagram of a car radio according to the invention.
  • FIG. 2 represents the steps of the method according to the invention.
  • the controller is a programmed microprocessor as is the demodulator; the connections between the various modules mentioned above, and other modules not mentioned, are numerous but they include neither the CKPI connection nor the EQ connection, between the controller and the decoder, which we will talk about later.
  • the controller knows whether the power received on each alternative frequency is lower or not than the power received on the current channel (to do this, we can proceed as indicated in the European patent application EP-A-0 098 634 of June 14, 1983 - 'MCC'). If, at some point, it is planned to change the channel, you must first check that it is the same program.
  • the controller When the controller initializes (INIT) the verification procedure, it indicates to the tuner the alternative frequency chosen, it requests silence from the amplifier and it starts a time counter 'd1'.
  • the decoder also receives, from the controller, a special CKPI command and, at this time, each bit received is stored in a table (BITA) of the decoder; during the time between the reception of two consecutive bits (this time is of the order of a millisecond), the decoder has time to check (TPI) if the table contains a bit configuration identical to that of identification program (PI) of the channel that was previously running.
  • BITA table of the decoder
  • the PI has 16 bits which are repeated every 104 bits received, so as soon as one has received 16 bits there is a small chance that these are the bits of the PI; practically we verify two things: 1) equality of the PI or not (TPI), and 2) full table or not (TAF).
  • TD2 time counter 'd2' is started (TD2) and, when it reaches zero, (TD20K) the above operations (INIT) are executed again until the signal EQ or EQ be positioned.
  • the EQ signal or EQ
  • the content of the table can be kept and updated bit by bit by continuing the input as well as the verification test.
  • This sequence of operations timed by the down counters 'd1' and 'd2' aims to acquire the RDS data of the alternative channel in a manner that is inaudible to the listener.
  • the duration 'd2' must be measured so that the storage position in the table a second 23-bit train is known. The measurement can be carried out either in the controller, in the decoder, or in both when the durations 'd1' and / or 'd2' are not constant.
  • the duration 'd2' can notably depend on the other tasks of the controller.
  • the transmitted bits are repeated every 104 bits and it is clear that the duration 'd2' must imperatively be different from 'N-d1' + iN otherwise the bits entered are would always be the same; in practice d2 must be different from 81,185,289, ....

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Radio Transmission System (AREA)
EP91200457A 1990-03-09 1991-03-04 Récepteur avec des moyens d'acquisition et de comparaison des données d'identification de deux canaux de transmission Expired - Lifetime EP0445885B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9003025 1990-03-09
FR9003025A FR2659511A1 (fr) 1990-03-09 1990-03-09 Procede d'acquisition et de comparaison des donnees d'identification de deux canaux de transmission, et appareil recepteur correspondant.

Publications (2)

Publication Number Publication Date
EP0445885A1 EP0445885A1 (fr) 1991-09-11
EP0445885B1 true EP0445885B1 (fr) 1995-09-13

Family

ID=9394569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200457A Expired - Lifetime EP0445885B1 (fr) 1990-03-09 1991-03-04 Récepteur avec des moyens d'acquisition et de comparaison des données d'identification de deux canaux de transmission

Country Status (6)

Country Link
US (1) US5222254A (ja)
EP (1) EP0445885B1 (ja)
JP (1) JP3048661B2 (ja)
AT (1) ATE127978T1 (ja)
DE (1) DE69112871T2 (ja)
FR (1) FR2659511A1 (ja)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103062C2 (de) * 1991-02-01 1994-03-31 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4106852A1 (de) * 1991-03-04 1992-09-10 Becker Autoradio Verfahren zur abstimmung eines mikrocomputergesteuerten rundfunkempfaengers
EP0627138B1 (de) * 1992-02-19 1996-07-10 HENZE, Werner Demodulator für radio-daten-signale
DE4226346A1 (de) * 1992-08-08 1994-02-10 Philips Patentverwaltung Schaltungsanordnung zur Bestimmung der Feldstärke von FM-Sendern
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
JP3049164B2 (ja) * 1992-12-25 2000-06-05 株式会社ケンウッド データ多重放送用チューナ
JP3204282B2 (ja) * 1993-09-10 2001-09-04 ソニー株式会社 受信機
DE4338412C1 (de) * 1993-11-10 1995-03-02 Becker Gmbh Verfahren zur Detektion von Informationen im RDS-Datenstrom
JPH08274666A (ja) * 1995-03-30 1996-10-18 Sanyo Electric Co Ltd Ｆｍ受信機およびこれに用いられる信号処理装置
JPH08274667A (ja) * 1995-03-30 1996-10-18 Sanyo Electric Co Ltd Ｆｍ受信機およびこれに用いられる信号処理装置
US5635924A (en) * 1996-03-29 1997-06-03 Loral Aerospace Corp. Travel route information monitor
DE19614322A1 (de) * 1996-04-11 1997-10-16 Grundig Ag Verfahren für den Empfang und die Auswertung von RDS-Datenströmen mehrerer Sender
DE19847019A1 (de) * 1998-10-13 2000-04-20 Bosch Gmbh Robert Demodulator für ein Multiplexsignal eines RDS-Rundfunkempfängers
EP1073224A3 (en) * 1999-05-07 2002-08-14 Sony International (Europe) GmbH Strategy for switching to Alternative Frequencies (AF) for Digital Radio Mondiale (DRM)
DE10004002A1 (de) * 2000-01-29 2001-08-09 Bosch Gmbh Robert Verfahren zum Verdecken von Unterbrechnungen der Wiedergabe empfangener Rundfunksignale
EP1432156A1 (en) * 2002-12-20 2004-06-23 Sony International (Europe) GmbH Method for monitoring broadcast signals at alternative frequencies and gain control unit
US8841964B2 (en) 2010-03-10 2014-09-23 Zurich Instruments Ag Apparatus and method for demodulating an input signal
WO2012023830A2 (ko) * 2010-08-19 2012-02-23 한국전자통신연구원 방송 데이터를 이용한 채널 정보 획득 장치 및 방법
GB2501084A (en) * 2012-04-11 2013-10-16 Frontier Silicon Ltd Receiver method for rapid detection of alternative broadcast frequencies (AFs) without perceived disruption
US10425939B2 (en) * 2015-11-30 2019-09-24 At&T Intellectual Property I, L.P. Method and apparatus for automated signal analysis and reporting among RF receiver devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57101417A (en) * 1980-12-16 1982-06-24 Mitsubishi Electric Corp Receiver
JPS6467037A (en) * 1987-09-07 1989-03-13 Clarion Co Ltd Receiving method in rds system radio
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

Also Published As

Publication number Publication date
JPH05308301A (ja) 1993-11-19
ATE127978T1 (de) 1995-09-15
DE69112871T2 (de) 1996-04-25
JP3048661B2 (ja) 2000-06-05
US5222254A (en) 1993-06-22
EP0445885A1 (fr) 1991-09-11
FR2659511A1 (fr) 1991-09-13
DE69112871D1 (de) 1995-10-19

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