Noise cross PSD estimation using phase information in diffuse noise field

Authors:
M. Rahmani;A. Akbari;B. Ayad;B. Lithgow
Affiliations:
Research Center for Information Technology, Iran University of Science and Technology, Iran;Research Center for Information Technology, Iran University of Science and Technology, Iran;Research Center for Information Technology, Iran University of Science and Technology, Iran;Centre for Biomedical Engineering, Monash University, Australia
Venue:
Signal Processing
Year:
2009

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Abstract

Among various speech enhancement methods, two-microphone noise reduction systems are utilized for their low cost implementation and acceptable performance. Coherence-based methods are well known as efficient two-microphone noise reduction techniques. These techniques, however, do not work well when the received noise signals are correlated. Coherence-based methods can be improved when the cross power spectral density (CPSD) of input noises is available. In this paper, we propose a new method for estimating noise CPSD based on the assumption of a diffuse noise field. With this assumption, we estimate the noise CPSD using phase information. Then, the estimated noise CPSD is used to calculate a coherence-based gain filter which is then employed to enhance noisy signals. We compare the proposed phase-based noise CPSD estimation with a noise CPSD estimation technique based on a voice activity detector (VAD), both of which are herein separately employed in a two-microphone speech enhancement configuration. The comparison shows that the two-microphone speech enhancement scheme utilizing the proposed noise CPSD estimation technique outperforms the enhancement system using the VAD-based noise CPSD estimation.