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METHOD AND DEVICE FOR DETECTING A DISPLACEMENT AND MOVEMENT OF A SOUND PRODUCING UNIT OF A WOOFER

  • US 20090190789A1
  • Filed: 01/21/2009
  • Published: 07/30/2009
  • Est. Priority Date: 01/17/2008
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a loudspeaker system comprising a woofer installed in a housing, said woofer comprising a sound producing unit;

    a transmitter for transmitting an ultrasonic audio signal;

    a receiver for receiving the ultrasonic audio signal;

    a detection unit for determining the position of the sound producing unit on the basis of a phase difference between the ultrasonic audio signal received by the receiver and the ultrasonic audio signal transmitted from the transmitter, said phase difference being dependent on the length of the signal path between the transmitter and the receiver;

    a control unit for adjusting a spring constant effecting to the sound producing unit of the woofer on the basis of the determined position.

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