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Apparatus and method of broadcasting audible sound using ultrasonic sound as a carrier

  • US 6,052,336 A
  • Filed: 05/01/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 05/02/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus, comprising:

  • a unit amplitude modulating an ultrasonic signal with a square root of an information signal to produce a modulated signal; and

    a projector coupled to said unit and projecting the modulated signal to a listener.

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