(19)
(11) EP 0 434 468 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.05.1992 Bulletin 1992/22

(43) Date of publication A2:
26.06.1991 Bulletin 1991/26

(21) Application number: 90314217.2

(22) Date of filing: 21.12.1990
(51) International Patent Classification (IPC)5: G10K 11/16
(84) Designated Contracting States:
DE FR GB

(30) Priority: 22.12.1989 JP 331016/89
16.02.1990 JP 33790/90

(71) Applicant: Bridgestone Corporation
Tokyo 104 (JP)

(72) Inventors:
  • Miyazaki, Toshihiro
    Yokohama City, Kanagawa Pref. (JP)
  • Mizuno, Keiichiro
    Ohta-Ku, Tokyo (JP)
  • Iida, Kazuyoshi
    Iruma City, Saitama Pref. (JP)
  • Murakami, Kazutomo
    Yokohama City, Kanagawa Pref. (JP)

(74) Representative: Whalley, Kevin et al
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Vibration control system


    (57) A vibration control system comprises at least one original vibration detecting means (7) located on or close to each of at least one vibration source (2) for detecting an original vibration or noise from the vibration source, at least one controlled vibration applying actuator (6) provided on an acoustic radiator (5) which is vibrated by the original vibration or noise, and controlling means for receiving a signal from the original vibration detecting means and outputting a control signal to the controlled vibration applying actuator, the controlling means including a digital filter (8) which produces a control signal for actuating the vibration applying actuator (6) so as to generate a controlled vibration wave having an inverse waveform which is of an opposite sign to the original vibration, thereby offsetting the original vibration with the controlled vibration to reduce the original vibration of the acoustic radiator and effectively isolate noise of a random vibration.






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