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Power amplification for parametric loudspeakers

  • US 7,319,763 B2
  • Filed: 07/11/2001
  • Issued: 01/15/2008
  • Est. Priority Date: 07/11/2001
  • Status: Expired due to Term
First Claim
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1. A power amplifier system to provide improved power efficiency in a parametric loudspeaker system, comprising:

  • (a) a switching power stage in the power amplifier;

    (b) wherein a carrier frequency signal can be amplified by the switching power stage;

    (c) and wherein an audio frequency range signal giving rise to at least one corresponding sideband frequency signal different from the carrier frequency signal when the carrier signal is modulated by the audio frequency range signal can be used to modulate the carrier and a corresponding at least one sideband frequency is also amplified by the switching power stage;

    (d) at least one transducer, electrically coupled to the power amplifier; and

    ,(e) wherein a switching frequency of the switching power stage is less than ten times the highest frequency of a modulated carrier frequency signal to be reproduced in the parametric loudspeaker system.

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