Background noise control for speech enhancement applications

Speech enhancement systems need to have acceptable residual noise and acceptable speech distortion. Some of frequency based noise reduction systems use a spectral modification filter to modify the noisy speech spectrum and remove the background noise. In these methods distortion and musical noise are two well-known annoying effects. In this paper we propose to shape the residual noise in order to decrease annoying musical residual noise. In addition we propose to control the level of residual noise and to shape it. We show that by controlling the residual noise level we can achieve the enhanced speech signal with less distortion and less musical noise.

Keywords:

Noise shaping , amplitude spectral subtraction , speech distortion , residual noise