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Anti-sound beam method and apparatus

  • US 6,434,239 B1
  • Filed: 10/03/1997
  • Issued: 08/13/2002
  • Est. Priority Date: 10/03/1997
  • Status: Expired due to Fees
First Claim
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1. A method of at least partially canceling sound produced by an audio source comprising the steps of:

  • generating a sound canceling signal in response to the audio source;

    modulating an ultrasonic carrier signal with the sound canceling signal to produce a modulated carrier signal;

    exciting a transducer with the modulated carrier signal to produce a substantially directional anti-sound beam; and

    directing the anti-sound beam towards the audio source.

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