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]
• • 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

Definitions

• the invention relates to a method for calling a radio program in mobile radio receivers that can receive and process information according to the radio data system (RDS) and have storage options for storing data relating to the reception frequency and RDS data.
• RDS radio data system
• the radio data system transmits data in VHF radio, which transmits information to the listener in addition to the broadcast radio program. This additional information should serve the listener to facilitate the voting process. For this purpose, data are transmitted which indicate the program name so that the listener does not have to listen for a certain time or look up a frequency table to know which program he has set.
• the broadcasting of an AF list offers great advantages for reception in car radios. This list contains broadcast frequencies on which the same program is broadcast as on the currently set frequency.
• a PI code which is a code for identifying the program, is also broadcast.
• a PI code is assigned to each program so that this code can be checked determine whether the same program is received again when the tuning frequency changes.
• German patent application DE-A-37 25 487 a method is described which relates to the evaluation of the information transmitted with the radio data system.
• the AF code and / or the PI code are evaluated, so that it is determined at which alternative transmission frequencies the program signal of the current reception frequency can still be received.
• the alternative transmission frequencies are determined by evaluating the AF code and the PI code, which are then briefly tuned and checked for reception quality. The frequency with the best reception quality is then set. A method is described below which specifies the acquisition of criteria for determining the reception quality. The recipient is then tuned according to the quality of reception.
• German patent application DE-A-38 32 455 describes a method with which the change from a frequency of a program to a more receivable frequency of the same program is to be carried out if the reception quality on the first frequency is no longer sufficient to to process the RDS data. The change takes place while waiting for an interruption a traffic announcement announcement code is reported.
• the applicant's patent application EP-A-0 415 132 describes an RDS radio receiver which, when checking the alternative frequencies which are stored in a memory or are contained in the received RDS data, also takes into account those whose regional identification, i.e. second digit of the PI code, differs from that just received if no transmitter with the same PI code can be received. In this way, if a regional program chain is lost, a switch is made to another program in a national program chain if one moves from one regional area to another.
• each frequency is assigned a rank which is dependent on the identity of the PI code and the reception quality.
• the reception quality the RDS quality (error-free code recognition) and the RF reception quality, such as multi-path reception, reception field strength and transmitter center, are checked. If no frequency with sufficient RDS quality is found, i.e. If the error rate in the decoding of the RDS data exceeds a permissible limit, the frequency with the highest field strength is set, provided that it is concluded from the RF reception quality that the hearing quality is sufficient.
• the frequency set in this way remains set for a predeterminable time. A search for the same program chain is only started if there is no RDS identification during this time.
• the data belonging to the program are combined into one when a program is called RAM loaded.
• the PI code, the alternative frequencies and the station name are then in the working memory.
• all stored frequencies are evaluated, the evaluation being based on the RF reception quality and possible RDS decoding.
• Each frequency is briefly tuned for evaluation.
• the PI code and the RF quality, in particular the reception field strength, are checked, and the alternative frequency is stored in the working memory with the evaluation of the rank.
• the next frequency is checked in the same way, the ranking being compared with the last or the best frequency to date.
• the best frequency is given an identifier, which is required for later tuning, and is stored in the working memory.
• the working memory is divided into several areas according to the ranking when storing the checked frequencies. Within each area, the frequencies stored there are sorted according to RF reception quality.
• the ranking levels are arranged in such a way that the highest rank is assigned to the match of the PI code of the program called and the frequency checked.
• the next stage comprises the frequency whose PI code differs in the second digit.
• the field-strongest frequency of this ranking level is set when all alternative frequencies that are stored in the working memory are checked and all are checked no frequency with the same PI code was found.
• a frequency of the last rank has been set, it remains set for a predetermined time, for example 20 seconds. During this time, an attempt is made to identify the PI code. If this is not successful, a search is started.
• the station name is shown in the display when a program is called up by an RDS receiver, in an advantageous embodiment of the invention, when a frequency is set without PI code identification after a predetermined time, the set frequency is displayed instead of the station name, since under some circumstances a different one Program can be set as that assigned to the program memory location.

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

Applications Claiming Priority (2)

Publications (3)

Family

ID=6400382

Family Applications (1)

Country Status (2)

Families Citing this family (8)

Family Cites Families (6)

• 1990
  • 1990-02-19 DE DE4004987A patent/DE4004987A1/de active Granted
• 1991
  • 1991-02-14 EP EP91102078A patent/EP0443436B1/de not_active Expired - Lifetime
  • 1991-02-14 DE DE59105680T patent/DE59105680D1/de not_active Expired - Lifetime

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