Perceptually weighted multi-band spectral subtraction speech enhancement technique
Md. Faqrul Alam Chowdhury, Jahangir Alam, Md. Fasiul Alam, Douglas D. O’Shaughnessy · 2008
It is gaining extensive research concentration to estimate a suitable factor that will subtract just the necessary amount of the noise spectrum from each frequency bin (ideally) to prevent destructive subtraction of the speech while removing most of the residual noise. Considering the advantage of multi-band spectral subtraction method which takes into account the fact that colored noise affects the speech spectrum differently at various frequencies and also of perceptual frequency weighting technique that allows for an automatic adaptation in the time and frequency of the enhancement system and finds a suitable noise estimate according to the frequency of the corrupted speech, our proposed method offers a better spectral approximation of the clean speech signal than these two method.