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Audio apparatus

  • US 7,016,508 B1
  • Filed: 05/23/2000
  • Issued: 03/21/2006
  • Est. Priority Date: 06/14/1999
  • Status: Expired due to Fees
First Claim
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1. An audio apparatus comprising a modulator for modulating a first ultrasonic signal with an audio signal to provide a second ultrasonic signal lying within a first frequency range;

  • a transducer for converting the second ultrasonic signal into an ultrasonic pressure wave for transmission into a non-linear medium to allow demodulation of the ultrasonic pressure wave and thereby generate an audio pressure wave representative of the audio signal wherein the transducer has conversion characteristics that determine how an amplitude of the ultrasonic pressure wave varies with an amplitude of the second ultrasonic signal across the first frequency range;

    processing means for modifying the audio signal to compensate for the demodulating properties of the non-linear medium; and

    means for modifying the audio signal to compensate for a variation, with frequency, of the conversion characteristics of the transducer across the first frequency range.

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