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Parametric loudspeaker with improved phase characteristics

  • US 6,850,623 B1
  • Filed: 10/29/1999
  • Issued: 02/01/2005
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Term
First Claim
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1. A parametric loudspeaker system, comprising:

  • an electronic modulator, adapted to receive audio signals, wherein the electronic modulator generates a carrier frequency to be modulated with the audio signals to produce a modulated signal;

    at least two ultrasonic transducers, coupled to the electronic modulator to reproduce the modulated signal, the at least two ultrasonic transducers each having at least one resonant frequency, wherein the carrier frequency is offset from each at least one resonant frequency in view of the rate of change of phase of each transducer in the vicinity of each at least one resonant frequency in order to increase the phase coherence and combined parametric output of said transducers.

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