Cardioid beam with a desired null based acoustic devices, systems and methods
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United States of America Patent
Stats
-
Jun 10, 2008
Grant Date -
Apr 7, 2005
app pub date -
Jul 26, 2002
filing date -
Aug 1, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An acoustic device is provided with first and second one or more acoustic elements to generate a first signal that includes mostly undesired audio and substantially void of desired audio, and a second signal that includes desired as well undesired audio respectively. The first one or more acoustic elements are designed and arranged to generate a Cardioid beam with a null at an originating direction of the desired audio. The second one or more acoustic elements are designed and arranged to generate a complementary beam that includes the desired audio. A system is provided with an appropriate signal processing logic to recover the desired audio using the first and second signals. The signal processing logic may practice echo cancellation like techniques or blind signal separation techniques.
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