Microphone array processing system for noisy multipath...

Details Microphone array processing system for noisy multipath... Microphone array processing system for noisy multipath...

2011-08-16

2011-08-16

Faulk, Devona E (Department: 2614)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Using signal channel and noise channel

C381S094100, C381S094300

Reexamination Certificate

active

08000482

ABSTRACT:
Apparatus and a corresponding method for processing speech signals in a noisy reverberant environment, such as an automobile. An array of microphones (10) receives speech signals from a relatively fixed source (12) and noise signals from multiple sources (32) reverberated over multiple paths. One of the microphones is designated a reference microphone and the processing system includes adaptive frequency impulse response (FIR) filters (24) enabled by speech detection circuitry (21) and coupled to the other microphones to align their output signals with the reference microphone output signal. The filtered signals are then combined in a summation circuit (18). Signal components derived from the speech signal combine coherently in the summation circuit, while noise signal components combine incoherently, resulting in composite output signal with an improved signal-to-noise ratio. The composite output signal is further processed in a speech conditioning circuit (20) to reduce the effects of reverberation.

REFERENCES:
patent: 6317501 (2001-11-01), Matsuo
patent: 6332028 (2001-12-01), Marash
patent: 6453285 (2002-09-01), Anderson et al.
patent: 6654468 (2003-11-01), Thompson

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