Adaptive noise cancelling microphone system

Details Adaptive noise cancelling microphone system Adaptive noise cancelling microphone system

2005-07-12

2005-07-12

Isen, Forester W. (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Using signal channel and noise channel

C381S122000

Reexamination Certificate

active

06917688

ABSTRACT:
An adaptive noise canceling microphone system for extracting a desired signal, in particular a desired speech signal, comprising two microphones being arranged at a predefined distance from each other; a signal forming system (SFS) being adapted to receive a first and second input signals resulting from sounds received by the two microphones wherein an acoustical signal component in the first input signal is determined, wherein an acoustical signal component in the second input signal is determined, wherein the acoustical signal component in the first input signal is enhanced to generate a speech enhanced signal, and wherein the acoustical signal component in the second input signal is suppressed to generate a speech nulled signal; an adaptive noise cancellation filtering circuit being adapted to receive the speech enhanced signal and the speech nulled signal, wherein the noise in the speech enhanced signal is cancelled using the speech nulled signal as reference, thereby generating an output filtered signal representing the desired signal.

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patent: 2002/0009203 (2002-01-01), Erten
patent: WO 01/95666 (2001-12-01), None
B. Widrow et al., “Adaptive Noise Cancellation: Principles and Applications,”Proc. IEEE,1975.

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