VERFAHREN UND VORRICHTUNG ZUR RAUSCHUNTERDRÜCKUNG EINES DIGITALEN SPRACHSIGNALS

摘要

The invention concerns a method for suppressing noise in a digital speech signal processed by successive frames which consists in: computing the signal spectral components (Sn,f, Sn,i) on each frame; computing the maximised estimations (B'?n,i?) of spectral components of the noise included in the speech signal; carrying out a harmonic analysis of the signal to estimate a pitch; carrying out a spectral subtraction comprising at least a step consisting in subtracting respectively, from each spectral component of the speech signal on the frame (Sn,f), a quantity depending on parameters including the maximised estimation of the noise corresponding spectral component and the estimated pitch; and applying to the subtraction result a transform towards the time domain to construct an enhanced speech signal (s<3>).