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
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
  • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
  • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
• • 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
  • 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
  • H04H2201/00—Aspects of broadcast communication
  • H04H2201/60—Aspects of broadcast communication characterised in that the receiver comprises more than one tuner

Definitions

• the invention relates to a method for changing the program in the event of a brief signal failure according to the preamble of claim 1.
• EON Enhanced Other Networks Information
• receivers can be automatically tuned to the frequency of a traffic information station while receiving normal radio programs, as long as this traffic information station broadcasts a current traffic report. This gives the driver the opportunity to receive any radio program without traffic announcements, without having to forego current traffic reports.
• the transmitter broadcasting the normal radio program uses both PI codes (Program Identification Codes) to identify the program chains and PS codes (Program Service Codes) to transmit the program names consisting of a maximum of 8 alphanumeric characters (e.g. "Bavaria 3 ") and AF codes (Alternative Frequencies Codes) to provide replacement frequencies for the respective traffic radio station.
• PI codes Program Identification Codes
• PS codes Program Service Codes
• AF codes Alternative Frequencies Codes
• a receiving device that is outside the actual reception area of a local station will try to switch to this local traffic radio station as soon as possible it receives an indication of an upcoming traffic announcement via the currently received national broadcaster, which initially mutes the currently received national program until the receiving device determines that the PI code of the offered traffic radio station cannot be detected properly. This process can take up to a second before the receiver switches back to the previously received program. Since the traffic announcements of different local stations are staggered in time, the reception of a nationally broadcast program may be continuously disrupted.
• a radio receiver which, with the aid of address data transmitted in the RDS signal, is capable of optically or acoustically reproducing standardized texts stored on the receiver side to describe the traffic situation. So that only certain traffic information relating to the respective field of action of the mobile receiver is output, the radio receiver contains a first memory in which a list of different regions and the transmitter frequencies receivable there is permanently stored. The transmission frequencies that can be received on site are written into a second memory via a station search and compared with the frequencies stored in the first memory via a comparison device. The current reception region is then the one in which at least partial agreement between the frequencies in the memories 1 and 2 is found.
• the circuit arrangement mentioned has the disadvantage that it requires an additional memory to specify the regional transmission frequency lists, the content of which is only valid as long as the transmission frequencies assigned to a region are not changed.
• different device versions are required for device export.
• EPA-0 446 985 has a method with which a current traffic report from the radiating traffic radio station is provided with a classification code word in the RDS data stream, which enables a receiver to differentiate between local, regional and national traffic messages. By manually programming the receiving device, the device user can predetermine what type of traffic announcement he wishes to hear.
• EP 0 459 360 discloses an RDS radio receiver with a device for locating alternative frequencies currently worth receiving.
• RDS broadcast receivers with only one receiver must use alternative frequencies if the reception conditions deteriorate, the quality assessment of which is no longer up to date at the time of switching.
• an RDS radio with two receiving parts is described, which continuously monitors the reception quality of alternative frequencies with the aid of a background receiver and empirically stores a list of RDS frequencies that are worth receiving with and in a background memory without traffic announcements from the area of action of the mobile receiver.
• traffic announcements on other frequencies of the same broadcaster can be shown automatically.
• EP 0 428 866 discloses a method for suppressing transmitter changes in the event of local interference in RDS receiving devices.
• a station search is carried out automatically if the reception quality drops below a specified limit and the alternative frequencies cannot be received in sufficient quality or if no alternative frequencies are available, as is the case with local stations.
• no search is started after checking the alternative frequencies, even if these are not worth receiving, but the last station selected is reset and received for a predetermined time.
• This method has the disadvantage that, in the event of a signal failure, there is no received signal for a certain time and then a long search is required again.
• the duration in which noise is output or the output is muted is also extended.
• the disadvantage here is that, in the event of an extensive signal failure on almost all frequencies, it takes a long time until a received signal with a reception quality that is not too bad is determined and until then no signal or noise is output.
• the car radio If the car radio is synchronized to a program other than the one broadcast in the tunnel, it is usually impossible to receive it after entering the tunnel due to the reduced field strength.
• a conventional RDS car radio then tries to synchronize the stored alternative frequencies for this program, which were previously transmitted with the RDS signal. However, this fails because this program is not broadcast in the tunnel.
• a conventional RDS car radio will then perform a complete search and re-allocate the program memory with the programs with the greatest field strength. Only then would the program sent in the tunnel be received.
• This object is achieved in that, in the event of a signal failure in the received program, it is first determined whether a successful change to one of the stored alternative frequencies is possible. If a change is not possible because the field strength is too low, the frequencies at which a minimum field strength can be detected are temporarily stored from the entire transmission frequency range and these frequencies are compared with the frequencies transmitted in EON mode for traffic radio programs. If there is a match, the receiver is synchronized to this frequency.
• only the frequencies stored in the EON list can be set and the received signal checked for its field strength.
• the EON list with transmission frequencies for traffic programs is quickly switched to a traffic program without the memory for alternative frequencies being used in a time-consuming programming process is reassigned.
• the modules already available for the RDS signal for RDS decoding, control of the receive modules and storage of the receive frequencies in the EON list or as an alternative frequency can also be used.
• the receiver is synchronized again with the previous reception frequency at certain time intervals and the field strength is detected. As soon as this is above a minimum field strength, the system switches back to one of the transmission frequencies of the previously received program.
• the entire transmission frequency range is then searched by the receiver and the frequencies at which a minimum field strength is received are compared with the EON list of frequencies that were previously transmitted with the EON signal. As soon as a match occurs, a traffic program has been found and the receiver synchronizes to this frequency.
• the receiver can also set the frequencies that are included in the EON list for receivable traffic programs and determine whether a minimum field strength is received. If this is the case, a traffic program has been found.
• the original reception frequency or the alternative frequencies entered in the AF list are set again at certain time intervals in order to detect the field strength. As soon as a minimum field strength has been detected at one of these frequencies, the system switches back to the originally set frequency or its alternative frequency.
• the time intervals can be selected so that signal pauses are used to briefly switch to the original frequency. The receiver is muted during this.

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

Applications Claiming Priority (2)

Publications (3)

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ID=7770525

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Citations (1)

Family Cites Families (5)

• 1995
  • 1995-08-26 DE DE19531527A patent/DE19531527C2/de not_active Expired - Lifetime
• 1996
  • 1996-08-08 ES ES96112768T patent/ES2210329T3/es not_active Expired - Lifetime
  • 1996-08-08 DE DE59610784T patent/DE59610784D1/de not_active Expired - Lifetime
  • 1996-08-08 EP EP96112768A patent/EP0762681B1/fr not_active Expired - Lifetime
  • 1996-08-08 AT AT96112768T patent/ATE252794T1/de active

Patent Citations (1)

Non-Patent Citations (2)

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