Dynamic carrier system for parametric arrays
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United States of America Patent
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May 29, 2007
Grant Date -
May 15, 2003
app pub date -
Sep 3, 2002
filing date -
Aug 31, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system configured to dynamically adjust the ultrasonic carrier level in a parametric array system in response to changing source signal input levels, and which employs a look-ahead delay strategy to enable optimal modulation of the carrier wave to eliminate constant ultrasonic carrier emission and reduce the ultrasonic carrier emission to what is actually needed to accommodate the db range of the source material, and at the same time, to also minimize noticeable distortion and sound artifacts of a high-power ultrasonic carrier, and/or distortion/artifacts arising from modulation of an ultrasonic carrier to reduce average power output; and thus it realizes advantages of carrier modulation based on source-signal level, while minimizing inherent drawbacks of carrier modulation.
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