Method and device for driving a directional speaker
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United States of America Patent
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-
Sep 21, 2010
Grant Date -
Dec 28, 2006
app pub date -
Dec 17, 2004
filing date -
Dec 18, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
for vibrating the diaphragm based on a compression cycle of the modulated carrier wave signal. The configuration, in which the ultrasonic carrier wave is modulated with an audio signal, can generate a small, narrow-directional audible sound field without using a parametric effect. At the same time, the ultrasonic carrier wave is modulated in such a way that the sound pressure distribution of a target audio signal (reproducing audible signal) can be obtained for output and, therefore, the sound quality of a sound signal output from the directional speaker is improved.
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