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Method of adjusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same

  • US 7,564,981 B2
  • Filed: 10/21/2004
  • Issued: 07/21/2009
  • Est. Priority Date: 10/23/2003
  • Status: Active Grant
First Claim
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1. A method of producing a parametric ultrasonic wave to be decoupled in air to create a decoupled audio wave that more closely corresponds to an audio input signal, the method comprising:

  • (a) ascertaining a linear response over a predefined frequency range of an acoustic output of an electro-acoustical emitter configured to be used for parametric ultrasonic output; and

    (b) creating a parametric ultrasonic processed signal by adjusting linear parameters of at least one sideband frequency range of a parametric ultrasonic signal to compensate for the linear response of the acoustic output of the electro-acoustical emitter such that content of an audio input signal and that of a decoupled audio wave more closely correspond.

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