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Parametric array modulation and processing method

  • US 20050207587A1
  • Filed: 08/26/2003
  • Published: 09/22/2005
  • Est. Priority Date: 08/26/2002
  • Status: Active Grant
First Claim
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1. In a system using the nonlinearity of a propagation medium to demodulate ultrasonic waves having audio modulated onto the ultrasonic frequency, audio signal processing circuitry comprising:

  • a delay means for the audio signal providing a delayed audio signal;

    envelope generator means providing an envelope signal which is a function of peaks of the audio signal over a predetermined interval;

    combiner means for the delayed audio signal and the envelope signal, the resulting combined signal being useful in processing for modulation of said ultrasonic frequency.

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