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APPARATUS AND METHOD OF GENERATING DIRECTIONAL ACOUSTIC WAVE

  • US 20040124739A1
  • Filed: 04/03/2003
  • Published: 07/01/2004
  • Est. Priority Date: 12/31/2002
  • Status: Abandoned Application
First Claim
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1. An apparatus for generating directional acoustic waves, comprising:

  • a pre-compensator, to receive an audio signal and perform pre-compensation thereon according to a selected ultrasonic air self-demodulation, and to output a signal;

    an ultrasonic modulator, to provide an ultrasonic carrier wave;

    an amplitude modulator, to receive the signal output by the pre-compensator and the ultrasonic carrier wave, and to load the signal into the ultrasonic carrier wave;

    a power amplifier, to receive and amplify the ultrasonic carrier wave loaded with the signal; and

    a directional ultrasonic beam emitter, to emit the ultrasonic carrier wave which has been self-demodulated by air and recover the audio signal to an audience.

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