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Parametric audio system

  • US 20080285777A1
  • Filed: 06/20/2008
  • Published: 11/20/2008
  • Est. Priority Date: 01/14/2000
  • Status: Active Grant
First Claim
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1. A parametric audio system for generating at least one airborne audio beam, comprising:

  • at least one audio signal source operative to provide at least one audio signal;

    a modulator operative to receive a signal representative of the audio signal, and to convert the signal representative of the audio signal into ultrasonic frequencies; and

    an acoustic transducer array including at least one acoustic transducer, the acoustic transducer array being operative to receive the converted signal, and to project the converted signal through the air along a selected path, thereby regenerating the audio signal along at least a portion of the selected path, the acoustic transducer array having an associated frequency response,wherein the acoustic transducer array further includes;

    a backplate having a surface and a succession of depressions formed on the surface, the respective depressions having at least one varying dimension; and

    a membrane with at least one conductive surface adjacently disposed along the backplate,wherein the membrane and the succession of depressions define the plurality of acoustic transducers, each of the plurality of acoustic transducers having an associated center frequency determined at least in part by the at least one varying dimension of a respective depression, andwherein the at least one varying dimension of the respective depressions are configured to vary so that the center frequencies of the respective acoustic transducers span a predetermined frequency range, thereby broadening the frequency response of the acoustic transducer array.

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