Noise suppression system and method

Details Noise suppression system and method Noise suppression system and method

1997-09-02

2000-09-19

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

381 941, 381 942, H04B 1500

Patent

active

061223840

ABSTRACT:
A system and method for noise suppression in a speech processing system is presented. A gain estimator determines the gain, and thus the level of noise suppression, for each frame of the input signal. If no speech is present in the frame, then the gain is set at a predetermined minimum. If speech is present in the frame, then a gain factor is determined for each channel of a predefined set of frequency channels. For each channel, the gain factor is a function of the SNR of speech in the channel. The channel SNRs are generated by a SNR estimator based on channel energy estimates provided by an energy estimator and channel noise energy estimates provided by a noise energy estimator. The noise energy estimator updates its estimates during frames in which no speech is present, as determined by a speech detector.

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