EP0510914B1 - RDS receiver - Google Patents

RDS receiver Download PDF

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Publication number
EP0510914B1
EP0510914B1 EP19920303555 EP92303555A EP0510914B1 EP 0510914 B1 EP0510914 B1 EP 0510914B1 EP 19920303555 EP19920303555 EP 19920303555 EP 92303555 A EP92303555 A EP 92303555A EP 0510914 B1 EP0510914 B1 EP 0510914B1
Authority
EP
European Patent Office
Prior art keywords
broadcasting station
list
data
code
check
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
EP19920303555
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0510914A3 (en
EP0510914A2 (en
Inventor
Takayuki Nakamura
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of EP0510914A2 publication Critical patent/EP0510914A2/en
Publication of EP0510914A3 publication Critical patent/EP0510914A3/en
Application granted granted Critical
Publication of EP0510914B1 publication Critical patent/EP0510914B1/en
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
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • 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
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/15—Arrangements for conditional access to broadcast information or to broadcast-related services on receiving information
    • 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
    • H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
    • H04H60/32—Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations
    • 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
    • H04H60/37—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 segments of broadcast information, e.g. scenes or extracting programme ID
    • 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
    • H04H60/38—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 broadcast time or space
    • H04H60/41—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 broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/43—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 broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast channels
    • 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 receiver utilizing RDS (Radio Data System) data.
  • RDS Radio Data System
  • RDS data can be added to a regular audio signal.
  • the RDS data are a collection of digital data related to broadcasting stations, programs, etc.
  • the RDS data include such data as:
  • the RDS data passes through an encoding process for error correction.
  • a subcarrier signal with a frequency of 57 kHz (three times the frequency 19 kHz of the stereo pilot signal) is balanced-modulated by the RDS data which has passed through the encoding process, the modulated signal is added to a monaural signal or a stereo composite signal to be frequency-multiplexed, and this multiplexed signal is transmitted carried by an FM band.
  • a person in a moving automobile can continuously receive a specific program by utilizing the RDS data and PI code.
  • reference characters A to C denote broadcasting stations
  • SA to SC denote their respective service areas
  • the broadcasting stations A to C are included in the same AF list and their PI codes are equal, and, further, that the automobile is traveling along the path through the service areas A to C as indicated by the arrow.
  • the broadcasting station A and the broadcasting station B are selected alternately.
  • the receiver while receiving a broadcast from the broadcasting station A, takes scores of seconds to select the broadcasting station B after checking up the AF list and checking the reception level, and it takes 300 msec or so to return the channel selection to the original broadcasting station A after selecting the broadcasting station B and checking its PI code.
  • DE-C-3 938 269 discloses an RDS system in which this problem can be avoided to a certain extent by inhibiting any switching operation for a time after an unsuccessful switching operation. Thus the previous station is held for a while.
  • JP-A-2 104 133 and JP-A-1090609 disclose RDS systems in which "hunting" of stations in the AF list is avoided by special types of operation during the checking of the strength of the alternative station.
  • the present invention has been made to further improve the RDS system in view of the problems as described above.
  • a receiver comprising:
  • the apparatus may then select again the broadcasting station of which the reception level fell below a specified value.
  • reference numeral 1 denotes an antenna
  • 2 denotes an antenna tuning circuit of an electronic tuning type.
  • this tuning circuit 2 a desired FM broadcast wave signal Sr with a frequency of fr can be obtained.
  • the intermediate-frequency signal Si is supplied, through an intermediate-frequency amplifier 5, to an FM demodulator 6, wherefrom an audio signal (a monaural signal or a stereo composite signal) Sa and a modulated signal Sm by RDS data are taken out.
  • the signal Sa is supplied to a speaker 9 through a low-pass filter 7 and a low-frequency amplifier 8.
  • the VCO 11 and circuits 12 to 15 together constitute a PLL 10. More specifically, the signal So from the VCO 11 is supplied to a variable frequency divider 12 so that its frequency is divided by N. The signal with divided frequency is supplied to a phase comparator 13 and, in the meantime, an oscillation signal Sp with a frequency of 100 kHz serving as a reference is taken out from an oscillator 14 and the signal Sp is supplied to the comparator 13, and a comparison output therefrom is supplied to the VCO 11 as a control voltage therefor through a low-pass filter 15. The output of the low-pass filter 15 is also supplied to the tuning circuit 2 as a tuning voltage.
  • the signal with divided frequency from the frequency divider 12 and the oscillation signal Sp have frequencies equal to each other.
  • the equality (i) holds.
  • the local oscillation frequency will vary in the range from 98.2 MHz to 118.7 MHz in increments of 0.1 MHZ, and, accordingly, the receive frequency fr will vary in the range from 87.5 MHz to 108.0 MHz in increments of 0.1 MHz, corresponding to the frequency dividing factor N.
  • Reference numeral 30 denotes a microcomputer for system control (for which, a 4-bit microcomputer MPD 75116 made by NEC Corporation was used), 31 denotes its CPU, 32 denotes a ROM in which for example the processing routine 50 shown in FIG. 2 is written, 33 denotes a RAM for work area, and 41 to 44 denote ports.
  • the memories 32 and 33 and ports 41 to 44 are connected with the CPU 31 through a system bus 36.
  • the port 41 is connected with the frequency divider 12 and the port 43 is connected with various operating keys 49 such as a tuning key.
  • a portion of the intermediate-frequency signal Si is taken out, and this signal Si is supplied to a detector circuit 21, wherefrom a reception level detection signal Ss whose D.C. level varies with the reception level of the broadcast wave signal Sr is taken out.
  • This signal Ss is supplied to an A/D converter 22 to be A/D converted to a digital signal and, then, supplied to the port 42.
  • the signals Sa and Sm are supplied to a bandpass filter 24 and the signal Sm is extracted therefrom.
  • This signal Sm is supplied to a demodulator 25 and the RDS data Sd is thereby demodulated.
  • the RDS data Sd is supplied to a decoder 26 and, after passing through an error correction process therein, supplied to the port 42.
  • a muting signal Sx is taken out from the port 44 and this signal Sx is supplied to the amplifier 8.
  • step 101 it is checked whether or not an entry is made from a key 49. When no key entry is made, the routine proceeds from the step 101 to the step 102. In the step 102, the level of the detection signal Ss is checked and thereby it is examined whether or not the reception level of the broadcast being currently received is above a specified value. When it is above the specified value, the routine returns from the step 102 to the step 101.
  • the routine proceeds from the step 101 to the step 103.
  • the process corresponding to the key entry is executed and the routine returns to the step 101.
  • the frequency dividing factor N corresponding to the key operation is established and this frequency dividing factor N is set up in the frequency divider 12 through the port 41, whereby a broadcast station with the frequency corresponding to the factor is selected.
  • AFD1 to AFDM denote frequency data included in the AF list.
  • the reception level of the broadcasting station A is lowered and the level of the detection signal Ss becomes lower as the automobile comes closer to the circumference (or goes further away from the broadcasting station A).
  • step 111 a pointer m designating the frequency data AFDi of the AF list AFLT is set to "1", and in the next step 112, the m th PI flag PFLG of the AF list AFLT is checked.
  • the routine proceeds from the step 112 to the step 113, and in this step 113, the amplifier 8 is muted by a muting signal Sx.
  • the m th frequency data AFDm is taken out from the AF list AFLT and this frequency data AFDm is, after being converted to a corresponding frequency dividing factor N, set in the frequency divider 12 through the port 41.
  • step 115 waiting for example of 10 msec is had until tuning in to the station in the step 114 is stabilized.
  • the level of the detection signal Ss is checked and it is thereby decided whether or not the reception level of the broadcasting station selected in the step 114 is above the specified value. If the level is below the specified value, the routine proceeds from the step 116 to the step 121 and, in this step 121, the original broadcasting station (the broadcasting station whose broadcast was being received when the steps 101 and 102 were being repeated) is selected.
  • next step 122 waiting for example of 5 msec is had until the station selection in the step 121 is stabilized, and in the following step 123, the muting of the amplifier 8 is released by the muting signal Sx. Therefore, from the point of time when the step 123 has been executed onward, it becomes possible to hear for some time the program of the original broadcasting station.
  • the routine returns from the step 125 to the step 112.
  • the selection is returned to the original broadcasting station, the broadcasting station A in the present example.
  • the routine proceeds from the step 116 to the step 131.
  • the routine proceeds from the step 131 to the step 132.
  • this step 132 waiting is had until the PI code is obtained from the broadcast selected in the step 114 (the waiting time being 200 to 300 msec).
  • the PI code is obtained, it is checked in the step 133 whether or not the obtained PI code is equal to the PI code of the broadcast which was being received originally (the broadcast that was being received when the processes in the steps 101 and 102 were being executed), and when they are equal, the routine returns from the step 133 to the step 101.
  • the broadcasting station selected in the step 114 continues to be received and this program is the same as the program which was being received originally.
  • the routine proceeds from the step 133 to the step 141.
  • the PI flag PFLG of the frequency data of the broadcasting station which is being currently selected out of the frequency data AFD1 to AFDM of the AF list AFLT i.e., the PI flag PFLG of the m th frequency data AFDm, is set to "0" (different), and in the next step 142, the amplifier 8 is muted by the muting signal Sx.
  • the routine advances to the step 121, and in the steps 121 to 125, setting for selection of the next broadcasting station is made and, thereafter, the routine returns to the step 112.
  • the broadcasting station selected in the step 114 provides a higher reception level than the specified value, if its PI code is different from the PI code of the broadcast which was being received originally, selection is switched to the next broadcasting station. At this time, the PI flag PFLG of the broadcasting station having the different PI code is set to "0".
  • the routine proceeds from the step 112 to the step 124.
  • an RDS receiver when a broadcasting station whose broadcast is being received is to be switched to the next broadcasting station as an automobile moves forward, if the PI code of the next broadcasting station is different from the PI code of the original broadcasting station, even if the next broadcasting station is that designated by the frequency data of the AF list, the broadcasting station is arranged not to be selected again by the provision of the steps 112 and 141. Accordingly, the program of the original broadcasting station is kept received during the traveling of the automobile, not interrupted by the operations for selecting the next broadcasting station, and the broadcast of the original broadcasting station can be heard continuously, though the condition of reception may be deteriorated.
  • the check in the step 112 is made according to the PI flag PFLG, it may also be applicable to have a list of frequency data with the different PI codes made in the step 141 and to have the list checked in the step 112. Otherwise, the frequency data itself may be eliminated from the AF list AFLT.
  • an RDS receiver when a broadcasting station whose broadcast is being received is to be switched to the next broadcasting station as an automobile moves forward, if the PI code of the next broadcasting station is different from the PI code of the original broadcasting station, even if the broadcasting station is that designated by the frequency data of the AF list, the broadcasting station is arranged to be prohibited from being selected by the provision of the steps 112 and 141. Accordingly, such meritorious effects can be obtained that the program of the original broadcasting station is kept received during the traveling of the automobile, not interrupted by the operations for selecting the next broadcasting station, and the broadcast of the original broadcasting station can be heard continuously, though the condition of reception may be deteriorated.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
EP19920303555 1991-04-25 1992-04-21 RDS receiver Expired - Lifetime EP0510914B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP122412/91 1991-04-25
JP12241291A JPH04326208A (ja) 1991-04-25 1991-04-25 受信機

Publications (3)

Publication Number Publication Date
EP0510914A2 EP0510914A2 (en) 1992-10-28
EP0510914A3 EP0510914A3 (en) 1993-06-09
EP0510914B1 true EP0510914B1 (en) 1997-07-23

Family

ID=14835172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920303555 Expired - Lifetime EP0510914B1 (en) 1991-04-25 1992-04-21 RDS receiver

Country Status (3)

Country Link
EP (1) EP0510914B1 (ja)
JP (1) JPH04326208A (ja)
DE (1) DE69221012T2 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2570285Y2 (ja) * 1991-09-06 1998-05-06 株式会社ケンウッド ラジオ受信機

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6490609A (en) * 1987-09-30 1989-04-07 Clarion Co Ltd Rds automatic tracking system
JPH02104133A (ja) * 1988-10-13 1990-04-17 Pioneer Electron Corp Ｒｄｓ受信機における受信周波数選択方法
DE3938269C1 (ja) * 1989-11-17 1991-01-31 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig Hollaend. Stiftung & Co Kg, 8510 Fuerth, De

Also Published As

Publication number Publication date
DE69221012T2 (de) 1997-11-13
JPH04326208A (ja) 1992-11-16
DE69221012D1 (de) 1997-08-28
EP0510914A3 (en) 1993-06-09
EP0510914A2 (en) 1992-10-28

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