Parametric loudspeaker with improved phase characteristics

Details Parametric loudspeaker with improved phase characteristics Parametric loudspeaker with improved phase characteristics

2005-02-01

2005-02-01

Mei, Xu (Department: 2747)

Electrical audio signal processing systems and devices

Including phase control

C381S089000, C181S142000, C340S870250, C340S870260

Reexamination Certificate

active

06850623

ABSTRACT:
A parametric loudspeaker which uses multiple piezoelectric bimorph transducers. These multiple piezoelectric bimorphs have a resonant frequency which varies from unit to unit. The phase response at and near the resonant frequency changes at a very high rate with slight changes in frequency. The associated modulator electronics have a primary carrier frequency that is optimized for maximum parametric output. This is achieved by aligning the carrier frequency with the flattest portions of the phase curve for maximum phase coordination among the multiple devices.

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The audio spotlight: An application of noninear interaction of sound waves to a new type of loudspeaker design by Masahide Yoneyama and Jun-Ichiroh Fujimoto, J. Acoust. Soc.Am. 73 (5), May 1963, pp. 1532-1536.

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