Adaptive noise suppressor

Details Adaptive noise suppressor Adaptive noise suppressor

1985-10-10

1987-04-14

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 93, 381 47, H04R 2700, H04B 1500

Patent

active

046584269

ABSTRACT:
An adaptive noise suppressor for providing noise filtered signals. The noise suppression device employs a vector gain .mu. for the weights of the filter wherein the vector .mu. is selected for each frequency bin to be inversely proportional to the power spectrum. A projection operator is utilized to remove the effects of circular convolution to produce a linear convolution result wherein the weights are readjusted in a manner to minimize the difference between the input signal and the filter output signal, thereby minimizing the error signal to produce a noise suppressed signal in the filtered output. A frequency suppression device utilizes the same principles of the vector .mu. and projection operator, but the output is taken from the error output of the filter.

REFERENCES:
patent: 4025721 (1977-05-01), Graupe
patent: 4135590 (1979-01-01), Gaulder
patent: 4185168 (1980-01-01), Graupe
patent: 4227046 (1980-10-01), Nakajima
patent: 4468804 (1984-08-01), Kates
patent: 4490841 (1984-12-01), Chaplin
patent: 4493101 (1985-01-01), Muraoka

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