Patent ID: 7657038
Filing Date: 2010-02-02
Classification: G10L,H04R

Abstract:
1. A method of reducing noise in a speech signal, comprising: receiving at least two versions of said speech signal at a first filter; outputting by said first filter a speech reference signal comprising a desired signal and a noise contribution, and at least one noise reference signal comprising a speech leakage contribution and a noise contribution; applying a filtering operation to said at least one noise reference signal; and subtracting from said speech reference signal said filtered at least one noise reference signal to provide an output version of said speech signal having reduced noise therein, whereby said filtering operation of said at least one noise reference signal is performed with one or more filters having filter coefficients configured to minimize a weighted sum of the speech distortion energy and the residual noise energy in said output version of said speech signal, said speech distortion energy being the energy of said speech leakage contributions and said residual noise energy being the energy of said noise contribution in said speech reference signal and in said at least one noise reference signal.