Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Reexamination Certificate
2000-01-04
2008-05-20
Lee, Ping (Department: 2615)
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
C381S190000
Reexamination Certificate
active
07376236
ABSTRACT:
A speaker device for emitting subsonic, sonic or ultrasonic compression waves comprising a generally hollow drum, a rigid emitter plate attached to the drum, and a plurality of apertures formed within the plate which are covered by a thin piezoelectric film disposed across the emitter plate. A pressure source is coupled to the drum for developing a biasing pressure with respect to the thin film at the apertures to distend the film into an arcuate emitter configuration capable of constricting and extending in response to variations in the applied electrical input at the piezoelectric film to thereby create a compression wave in a surrounding environment. Parametric ultrasonic frequency input is supplied to the piezoelectric film to propagate multiple ultrasonic frequencies having a difference component corresponding to the desired subsonic, sonic or ultrasonic frequency range.
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Croft, III James J.
Khuri-Yakub Pierre
Norris Joseph O.
Selfridge Alan Robert
American Technology Corporation
Lee Ping
Thorpe North & Western LLP
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