Patent ID: 7065486

Claim:
A time-domain noise suppression method for suppressing a noise signal in a speech signal, said time-domain noise suppression method comprising: estimating a plurality of linear prediction coefficients for said speech signal; generating a prediction error estimate based on said plurality of prediction coefficients; generating an estimate of said speech signal based on said plurality of linear prediction coefficients; using a voice activity detector to determine a voice activity in said speech signal; updating a plurality of noise parameters based on said prediction error estimate if said voice activity detector determines no voice activity in said speech signal; generating an estimate of said noise signal based on said plurality of noise parameters; and passing said speech signal through a filter derived from said estimate of said noise signal and said estimate of said speech signal to generate a clean speech signal estimate; wherein said plurality of linear prediction coefficients are associated with a short-term linear predictor indicative of a spectral envelope of said speech signal and a long-term linear predictor indicative of a pitch periodicity of said speech signal, and wherein said plurality of noise parameters include a spectral estimate of said noise signal and a residual energy of said noise signal.