Noise suppression system and method therefor

Details Noise suppression system and method therefor Noise suppression system and method therefor

1994-07-18

1996-08-06

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 46, 381 47, 395 235, 395 236, 395 237, H04B 1500

Patent

active

055442501

ABSTRACT:
A noise suppression system (105) and method therefor includes a signal gain calculator (205) for calculating a constant gain value (701) for an input signal (116) according to a first function (703) responsive to a noise energy estimate (213) and a signal to noise ratio (SNR) estimate (215) until the SNR estimate (215) reaches a first predetermined SNR threshold (705), then calculating a variable gain value (707) for the input signal (116) according to a second function (709) responsive to the noise energy estimate (213) and the SNR estimate (215) until the SNR estimate (215) reaches a second predetermined SNR threshold (711) below the first predetermined SNR threshold (705), then calculating the constant gain value (701) responsive to the noise energy estimate (213) and the SNR estimate (215) when the SNR estimate (215) reaches the second predetermined SNR threshold (711). The constant gain value (701) is less than the variable gain value (707) when the SNR estimate (215) is between the first predetermined SNR threshold (705) and the second predetermined SNR threshold (711). The noise suppression system (105) and method therefor advantageously improves noise suppression without truncating the tail ends of speech while minimizing noise flutter.

REFERENCES:
patent: 4628529 (1986-12-01), Borth et al.
patent: 4630305 (1986-12-01), Borth et al.
patent: 4737976 (1988-04-01), Borth et al.
patent: 4809328 (1989-02-01), Usui et al.
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5159638 (1992-10-01), Naito et al.
patent: 5337251 (1994-08-01), Pastor
patent: 5432859 (1995-07-01), Yang et al.

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