Adaptive noise suppressor

Abstract From the Canadian patent

An adaptive noise suppressor for providing noise filtered speech signals for use as adaptive line enhancers, hearing aid devices, etc. The noise suppression 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 …