Parametric loudspeaker with improved phase characteristics
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United States of America Patent
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Issued Date -
Apr 28, 2005
app pub date -
Nov 8, 2004
filing date -
Oct 29, 1999
priority date (Note) -
Abandoned
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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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