Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2007-02-20
2007-02-20
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Directive circuits for microphones
Reexamination Certificate
active
10486784
ABSTRACT:
The present invention provides an adaptive directional microphone system for enhancing an acoustic signal from a second direction and for reducing an acoustic signal from at least a first direction different from the second direction, the system comprising:an omni-directional microphone and a directional microphone being arranged in a closely acoustically-coupled way;an adaptive filtering circuit system for generating a first error signal e1(n) corresponding to an acoustic signal in which the acoustic signal from the first direction is reduced; anda post-processing filter system for producing a second error signal e2(n) corresponding to an acoustic signal in which the acoustic signal from the second direction is enhanced as compared to the acoustic signal related to the first error signal e1(n).
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Lan Hui
Yu Zhuliang
Zhang Ming
Chin Vivian
Davidson Berquist Jackson & Gowdey LLP
Lao Lun-See
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