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Parametric audio system

  • US 8,027,488 B2
  • Filed: 07/13/2005
  • Issued: 09/27/2011
  • Est. Priority Date: 07/16/1998
  • Status: Active Grant
First Claim
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1. A parametric audio generator comprising:

  • (a) an ultrasonic signal source providing an ultrasonic carrier;

    (b) first and second ultrasonic transducers, said first transducer having a first acoustical-mechanical resonance and said second transducer having a second acoustical-mechanical resonance at a frequency higher than that of said first transducer;

    (c) a source of audio signals;

    (d) means for modulating said carrier with the audio signals to form a modulated carrier, whereby the frequency spectrum of the modulated carrier includes both of said transducer resonances;

    (e) means for driving said transducer with the modulated carrier;

    (f) means for splitting the modulated carrier into upper and lower frequency-range signals;

    (g) means for driving said first transducer with said lower frequency range signal; and

    (h) means for driving said second transducer with said upper frequency range signal.

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