(19)
(11) EP 0 503 202 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.04.1993 Bulletin 1993/17

(43) Date of publication A2:
16.09.1992 Bulletin 1992/38

(21) Application number: 91311992.1

(22) Date of filing: 23.12.1991
(51) International Patent Classification (IPC)5H04H 1/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 08.03.1991 JP 43264/91
08.03.1991 JP 43265/91
08.03.1991 JP 43266/91

(71) Applicant: PIONEER ELECTRONIC CORPORATION
Meguro-ku Tokyo 153 (JP)

(72) Inventors:
  • Kasa, Koichi, c/o Pioneer Electronic Corporation
    Kawagoe-shi, Saitama (JP)
  • Kunugi, Yoshiro, c/o Pioneer Electronic Corp.
    Kawagoe-shi, Saitama (JP)
  • Kurosu, Takaaki, c/o Pioneer Electronic Corp.
    Kawagoe-shi, Saitama (JP)

(74) Representative: Tomlinson, Kerry John et al
Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)


(56) References cited: : 
   
     
    Remarks:
    A request for correction of figure 5 of the drawings has been filed pursuant to Rule 88 EPC. A decision on the request will be taken during the proceedings before the Examining Division (Guidelines for Examination in the EPO, A-V, 2.2).
     


    (54) Method of controlling RDS receiver


    (57) To permit a user to listen to a broadcasting program of the same network in good receiving conditions when a multipath occurs on an RDS broadcasting wave that is being received at an intermediate field intensity, it is judged whether or not a lock detection signal is produced from a lock detector every unit time during reception of a broadcasting wave; and when the frequency of judgement in a set time that no lock detection signal is produced is greater than a reference value, frequency data of one station of that group of network stations to which a broadcasting station of the receiving broadcasting wave belongs is read out from a memory and the reception frequency is switched to the frequency indicated by the current frequency data read out. To ensure quick transition to the reception of the RDS broadcasting wave that can assure good receiving conditions even when a vehicle is driving in a tunnel or a mountainous area, an average level of a reception signal level of a currently receiving broadcasting wave may be calculated in a predetermined time at every given timing, and when a previous average level is higher than a first predetermined value and a current average level is lower than a second predetermined value smaller than the first predetermined value, or when the previous average level is lower than the second predetermined value and the current average level is higher than the first predetermined value, frequency data of one station of that network station group to which a broadcasting station broadcasting the currently receiving broadcasting wave belongs is read out from the memory, and the reception frequency is switched to the frequency indicated by the read out frequency data. Further, to ensure quick transition to the reception of the RDS broadcasting wave that can assure good receiving conditions even when the reception of the currently receiving RDS broadcasting wave becomes poor, when such poor reception of the currently receiving RDS broadcasting wave occurs, those pieces of frequency data which can assure a field intensity equal to or higher than a set level are first extracted from a frequency data list stored in the memory, then that piece of the extracted frequency data which has the highest reception signal level is selected, and the reception frequency is switched to the frequency indicated by the selected frequency data.







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