WASET
	%0 Journal Article
	%A Ch.V.Rama Rao and  Gowthami. and  Harsha. and  Rajkumar. and  M.B.Rama Murthy and  K.Srinivasa Rao and  K.AnithaSheela
	%D 2010
	%J International Journal of Electronics and Communication Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 46, 2010
	%T Noise Estimation for Speech Enhancement in Non-Stationary Environments-A New Method
	%U https://publications.waset.org/pdf/12790
	%V 46
	%X This paper presents a new method for estimating the nonstationary
noise power spectral density given a noisy signal. The
method is based on averaging the noisy speech power spectrum using
time and frequency dependent smoothing factors. These factors are
adjusted based on signal-presence probability in individual frequency
bins. Signal presence is determined by computing the ratio of the
noisy speech power spectrum to its local minimum, which is updated
continuously by averaging past values of the noisy speech power
spectra with a look-ahead factor. This method adapts very quickly to
highly non-stationary noise environments. The proposed method
achieves significant improvements over a system that uses voice
activity detector (VAD) in noise estimation.
	%P 1526 - 1529