Patent ID: 6477489
Filing Date: 2002-11-05
Classification: G10L

Abstract:
Method of suppressing noise in a digital speech signal processed by successive frames, comprising the steps of:computing spectral components of the speech signal of each frame; computing, for each frame, overestimates of spectral components of noise included in the speech signal; and performing a spectral subtraction including a first subtraction step in which a respective first quantity dependent on parameters including the overestimate of a corresponding spectral component of the noise for said frame is subtracted from each spectral component of the speech signal of the frame, to obtain spectral components of a first noise-suppressed signal; computing a masking curve by applying an auditory perception model on the basis of the spectral components of the first noise-suppressed signal; comparing the overestimates of the spectral components of the noise for the frame to the computed masking curve; and a second subtraction step in which a respective second quantity depending on parameters including a difference between the overestimate of the corresponding spectral component of the noise and the computed masking curve is subtracted from each spectral component of the speech signal of the frame.