An evaluation of an adaptive multichannel system for speech enhancement with automatic phase alignment

Abstract

This paper presents an evaluation of an adaptive multichannel system to enhancement of speech degraded by environment acoustic noise. The system input is a four microphone array connected to an automatic phase alignment unit which gives a gain of 2 to 4 dB. An estimation has been made of the spectral densities of speech and noise to be used as input to a Wiener filter, the coefficients of which are computed by a frequency domain algorithm. The signal estimated on filter output presents a total gain in the signal-to-noise ratio of about 10 dB. Informal subjective listening tests indicates an improvement in the signal quality and its intelligibility is considered very good.