Speech enhancement for nonstationary noise environment

A speech denoising technique based on an auditory filterbank is proposed in this paper. The noisy speech is first decomposed by the auditory filterbank into critical band signals. The denoising gain is calculated from the variance estimate for the subband signal and noise. The time varying subband noise variance is estimated by tracking the minimum variance of the subband noisy signal. This noise reduction technique is suitable for colored and nonstationary noise environment. It results in naturally sounding speech with a very low level of musical noise.