Method and apparatus for noise suppression in a small array...

Details Method and apparatus for noise suppression in a small array... Method and apparatus for noise suppression in a small array...

2007-01-05

2011-11-29

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Directive circuits for microphones

C381S110000, C704S214000

Reexamination Certificate

active

08068619

ABSTRACT:
A small array microphone system includes an array microphone having a plurality of microphones and operative to provide a plurality of received signals, each microphone providing one received signal. A first voice activity detector (VAD) provides a first voice detection signal generated using the plurality of received signals to indicate the presence or absence of in-beam desired speech. A second VAD provides a second voice detection signal generated using the plurality of received signals to indicate the presence or absence of out-of-beam noise when in-beam desired speech is absent. A reference signal generator provides a reference signal based on the first voice detection signal, the plurality of received signals, and a beamformed signal, wherein the reference signal has the desired speech suppressed. A beamformer provides the beamformed signal based on the second voice detection signal, the reference signal, and the plurality of received signals, wherein the beamformed signal has noise suppressed. A multi-channel noise suppressor operative to further suppress noise in the beamformed signal and provide an output signal. A speech reliability detector provides a reliability detection signal indicating the reliability of each frequency subband. The first voice detection signal, the second voice detection signal, the reliability detection signal and the output signal are provided to the speech recognition engine.

REFERENCES:
patent: 6138091 (2000-10-01), Haataja et al.
patent: 6295364 (2001-09-01), Finn et al.
patent: 7565288 (2009-07-01), Acero et al.

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