EP0552442B1 - Radio data system receiver - Google Patents

Radio data system receiver Download PDF

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Publication number
EP0552442B1
EP0552442B1 EP19920120335 EP92120335A EP0552442B1 EP 0552442 B1 EP0552442 B1 EP 0552442B1 EP 19920120335 EP19920120335 EP 19920120335 EP 92120335 A EP92120335 A EP 92120335A EP 0552442 B1 EP0552442 B1 EP 0552442B1
Authority
EP
European Patent Office
Prior art keywords
search
station
criterion
frequency
code
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
EP19920120335
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0552442A2 (en
EP0552442A3 (enrdf_load_stackoverflow
Inventor
Hiroshi Tanaka
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.)
Kenwood KK
Original Assignee
Kenwood KK
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Filing date
Publication date
Application filed by Kenwood KK filed Critical Kenwood KK
Publication of EP0552442A2 publication Critical patent/EP0552442A2/en
Publication of EP0552442A3 publication Critical patent/EP0552442A3/en
Application granted granted Critical
Publication of EP0552442B1 publication Critical patent/EP0552442B1/en
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
    • H04H20/26—Arrangements for switching distribution systems
    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/68—Systems specially adapted for using specific information, e.g. geographical or meteorological information
    • H04H60/73—Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information
    • H04H60/74—Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information using programme related information, e.g. title, composer or interpreter
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • 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
    • H04H60/27—Arrangements for recording or accumulating broadcast information or broadcast-related information

Definitions

  • the present invention relates to a radio data system (RDS) receiver capable of performing a reliable search for an alternative frequency (AF) broadcasting station.
  • RDS radio data system
  • a listener can easily search a preferred radio program or a broadcasting station having a good reception condition.
  • Receivers with various automatic functions can be designed by providing non-audible signals to VHF/FM transmitters.
  • Such automatic functions include an automatic tuning by reading a broadcasting station name, a correct clock, a quick tuning to another channel for picking up traffics information, an automatic turn-on of a preselected program, a display of the contents of a listening program, and other functions.
  • Signals for controlling these functions are digital codes superposed on main program radio signals.
  • This RDS system is flexible so as to add future new functions. The details of these codes are defined by the technical specification of European Broadcasting Union EBU (EBU Document 3244).
  • a most significant innovation of RDS is a display of "program and broadcasting station names".
  • This display is a text of 8 alphanumeric characters selected from a stipulated set of coded characters. This text is displayed i the manner similar to a digital frequency display widely used with current radio receivers. A listener can recognize which program is now broadcast and to which station the radio receiver is to be tuned. For example, for a first program of a national network, a text "BBC 1" is displayed.
  • This "program and broadcasting station names" display function is supplemented with a voice synthesizing function of a car radio for a listener to select a program or broadcasting station. For example, a listener can tell a broadcasting station name to tune to it.
  • the PI code is not displayed. This code made of 16 bits identifies a country and area to which the program is broadcast, and a broadcasting station broadcasting the program. The list of codes is determined by each country without consultation with other countries. Therefore, the main part of this code is a key to discriminating between countries.
  • the AF code is used, as an alternative of a voice input, to search an alternative frequency of the same program, to evaluate the signal intensity, and to make the radio receiver tune to another channel having the best reception condition.
  • This alternative frequency search is automatically performed by the radio receiver itself, so that the listener is not required to do anything.
  • an alternative frequency list is stored in a memory of a radio receiver. Accordingly, it is possible to avoid an unnecessary search for a channel from which a program cannot be received, and to thereby simplify the search operation.
  • Fig.3 is a flow chart showing the operation of an alternative frequency (AF) search by a conventional RDS receiver.
  • this conventional RDS receiver is disclosed by DE 40 39 117 A1.
  • AF search conditions determine whether an AF search is to be executed or not. If the AF search conditions have been established, AF except for reserve-marked AF is searched from the Af list (step S22). It is then checked whether the electric field Vs of the searched AF is greater than a predetermined value Va (step S23). If Vs is greater than Vs, the broadcasting station code of the PI code of the searched AF is checked (step S24).
  • the PI codes are made of four bytes, the first and second two bytes representing a "country code” and an "area code”, and the last two bytes representing a "broadcasting station code" of the same network broadcasting station (i.e., a station broadcasting the same program). If the broadcasting station code is the same as that of the PI code of the AF station in the pre-search, the receiving station is tuned to the searched AF (step S25).
  • step S24 if the broadcasting code is different from that of the AF station in the pre-search or if the PI code cannot be identified within a predetermined time period due to poor reception conditions, a reserve-mark of five minutes is attached to AF stations of different PI codes or AF stations with unsynchronized PI codes, to thereby stop the AF search of these AF stations for five minutes (step S26) and a radio reception is made at the frequency in the pre-search (step S27).
  • This step S27 is also executed if Vs is smaller than Va at step S23.
  • AF alternative frequency
  • the RDS receiver searches an AF station by using a PI code and an AF code of RDS data and switches to a broadcasting station having a good reception condition.
  • searching an AF station by using a PI code and an AF code it is judged whether an AF station has a different PI code or whether the PI code of an AF station cannot be identified in a predetermined time period.
  • Such an AF station is preferentially searched a predetermined number of times. If the same Af station remains under one of such conditions a predetermined number of times, then searching this AF station is reserved for a predetermined time period.
  • Fig.1 is a flow chart showing the operation of an RDS receiver according to an embodiment of the present invention
  • Fig.2 is a block diagram showing the structure of the RDS receiver shown in Fig.1.
  • a radio frequency signal received at an antenna ANT is amplified, tuned, and mixed at a front end F/E 1.
  • An intermediate frequency (IF) output signal of the front end 1 is selected, IF-amplified, and frequency-modulation detected by a detector IF/DET 2.
  • the intensity of the IF output signal is also detected by the detector 2.
  • Noises on the signal outputted from the IF/DET 2 are suppressed by a noise canceler NC 3.
  • This noise suppressed signal is stereophonically demodulated by a multiplexer MPX 4.
  • the level of this signal is controlled by a volume controller 5.
  • the signal then passes through a muting unit MUTE 6, is amplified by a power amplifier AMP 7, and reproduced as sounds from a loudspeaker SP.
  • the detected signal from the detector 2 is RDS demodulated by an RDS demodulator 8, and supplied, as RDS data synchronized by a synchronizing microcomputer 9, to a system microcomputer 10.
  • the S meter level signal from the detector 2 is also supplied to the system microcomputer 10.
  • the system microcomputer 10 processes the RDS data, stores data, and controls the entirety of the RDS receiver.
  • the low frequency components of a phase comparison output of PLL 12 derived by LPF 22 controls the VCO.
  • step S1 It is checked whether AF search conditions have been established (step S1). This check includes checking whether the electric field of a broadcasting station has changed to a value smaller than a preset value, and checking whether a predetermined time has lapsed from the previous AF search (which is performed at a predetermined time interval). If the AF search conditions have been established, an AF is searched from an AF list stored in a RAM of the microcomputer.
  • Each AF entry of the AF list has a count of an A counter.
  • the count of the A counter changes depending upon the results of an AF search.
  • the A counts of all AF entries in the AF list are 0.
  • AF entries are sequentially searched to find an AF satisfying the condition Vs > Va at step S3. If the PI code of the AF with Vs > Va is the same than that of the pre-search frequency, the broadcasting station is switched to the searched AF station at step S5.
  • the A count for the searched AF is cleared and set to 0. In this case or at the first AF search, the A count is initially 0 and so the cleared count is also 0.
  • step S3 If Vs > Va at step S3 but the PI code is not the same at step S4 because of some reason such as noises, then the A count is incremented by 1. Therefore, the A count is changed from 0 to 1. In this case, because the A count is not 2, reserving an AF search for five minutes is not executed at step S8. At step S9, the pre-search broadcasting station is received. The control then returns back to step S1.
  • the AF station which satisfies the condition Vs > Va but does not satisfy the condition of the same PI code, is searched twice. If the same PI code is not obtained by the two AF searches, this AF station is made to reserve the AF search for five minutes.
  • step S10 If the condition Vs > Va is not obtained at step S3, a radio reception is not changed to this AF station but it continues at the pre-search frequency broadcasting station (step S10).
  • the A count of this AF station is cleared to 0.
  • the RDS receiver of the present invention it is possible to reliably discriminate the AF stations to be searched from the AF stations which pose a problem when searched. Accordingly, it is possible not to search unnecessarily the AF stations which pose a problem when searched, reducing the possibility of receiving a different radio program. Furthermore, an AF station can be identified correctly, and a good radio reception condition can be obtained reliably by changing to this AF station.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
EP19920120335 1991-11-28 1992-11-27 Radio data system receiver Expired - Lifetime EP0552442B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP10596391U JP2558653Y2 (ja) 1991-11-28 1991-11-28 Ｒｄｓ受信機
JP10596391U 1991-11-28
JP105963/91U 1991-11-28

Publications (3)

Publication Number Publication Date
EP0552442A2 EP0552442A2 (en) 1993-07-28
EP0552442A3 EP0552442A3 (enrdf_load_stackoverflow) 1995-03-22
EP0552442B1 true EP0552442B1 (en) 2002-10-23

Family

ID=14421453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920120335 Expired - Lifetime EP0552442B1 (en) 1991-11-28 1992-11-27 Radio data system receiver

Country Status (3)

Country Link
EP (1) EP0552442B1 (enrdf_load_stackoverflow)
JP (1) JP2558653Y2 (enrdf_load_stackoverflow)
DE (2) DE69232829T2 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7542746B2 (en) * 2005-12-02 2009-06-02 Sony Ericsson Mobile Communications Ab RDS radio unit
KR101046618B1 (ko) 2008-07-30 2011-07-05 삼성전자주식회사 라디오 데이터 시스템의 대체 주파수 서칭 방법 및 이를위한 휴대 단말기

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE4005413C2 (de) * 1990-02-21 1993-12-16 Grundig Emv RDS-Rundfunkempfänger mit einer Einrichtung zum beschleunigten Auffinden alternativer Frequenzen
EP0669714B1 (en) * 1990-03-27 2002-11-13 Pioneer Electronic Corporation Frequency selecting method in RDS receiver
JP2788015B2 (ja) * 1990-04-10 1998-08-20 パイオニア株式会社 Ｒｄｓ放送受信機

Also Published As

Publication number Publication date
JP2558653Y2 (ja) 1997-12-24
DE69232829T2 (de) 2003-08-07
JPH0548431U (ja) 1993-06-25
EP0552442A2 (en) 1993-07-28
DE552442T1 (de) 1993-12-16
DE69232829D1 (de) 2002-11-28
EP0552442A3 (enrdf_load_stackoverflow) 1995-03-22

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