Patent ID: 8660281

Claim:
A method for a multi microphone noise reduction in a complex noisy environment, comprising: estimating a left and a right noise power spectral density for a left and a right noise input frame by a power spectral density estimator; computing a diffuse noise gain from the estimated power spectral density; extracting a target speech power spectral density from the noise input frame by a target speech power spectral density estimator; generating a directional noise gain from the target speech power spectral density and the noise power spectral density; calculating a pre-enhanced side frame from the diffuse noise gain and the directional noise gain; calculating auto regressive coefficients from the side frame for a Kalman filtering method; filtering the noisy input frame by the Kalman filtering method; generating a Kalman based gain from the Kalman filtered noisy frame and the noise power spectral density; and generating a spectral enhancement gain by combining the diffuse noise gain, the directional noise gain, and the Kalman based gain.