Circuit and method for acoustic source directional pattern determination utilizing two microphones
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United States of America Patent
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Issued Date -
Mar 6, 2003
app pub date -
Aug 29, 2001
filing date -
Aug 29, 2001
priority date (Note) -
Abandoned
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Abstract
A microphone for a full duplex speaker phone comprises a loudspeaker, a uni-directional microphone, a omni-directional microphone, and a background noise suppression circuit. The uni-directional microphone is a directional microphone such that the intensity of an acoustic source detected at the uni-directional microphone is dependent on the angular direction of the acoustic source relative to a reference direction. The omni-directional microphone is a non-directional microphone such that the intensity of the acoustic source detected at the omni-directional microphone is substantially independent of the angular direction of the acoustic source relative to the reference direction. The background noise suppression circuit determines the direction of the acoustic source by calculating a quotient between a signal strength of the acoustic source as detected by the two microphones and provides for suppressing an acoustic source that is not within a threshold angle of the reference angle.
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