Adaptive noise suppressor

Details Adaptive noise suppressor Adaptive noise suppressor

H - Electricity

03

H

328/0.3

H03H 21/00 (2006.01) G10L 21/02 (2006.01) H04R 25/00 (2006.01)

Patent

CA 1250348

Abstract of the Disclosure An adaptive noise suppressor for providing noise filtered speech signals for use as adaptive line enhancers, hearing aid devices, etc. The noise suppres- sion device employs a vector gain µ for the weights of the filter wherein the vector µ 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 noise suppressed speech in the filtered speech output. A frequency suppression device utilizes the same principles of the vector µ and projection operator, but the filter delay is now taken to be at least greater than a phonem. - 42 -

520142

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