Phase Differences Based Coherence Filter for Dual-Microphone System

Abstract

This paper proposes a dual-microphone coherence filter, which based on phase difference of two noisy signals. This method passes, without dirtortion target speaker. In real noisy environment, it’s difficult to get exactly information of condition noise field, especially in complex environment. Therefore a post-filtering, which is a function depends on speech presence probability, is suitable for compact dual-microphone and is adapted in the author's approach. The performance of suggested algorithm proved the stability and efficiency of the algorithm. This approach allows increasing performance of speech enhancement in term of signal-to-noise ratio and the amount of noise reduction. The author intends to continue using phase differences as conditions for different algorithms speech quality improvement under various noise conditions.