First International Conference on Spoken Language Processing (ICSLP 90)
A new approach of recovering acoustically reverberated signals using Multi-microphone Sub-Band Envelope Estimation (M-SBEE) is proposed. The transfer functions between sound source and microphones have different zero distributions in the z-plane. This method takes the advantage of the differences of the zero distributions by chosing the best behaved microphone for each sub-band, and reconstruct the full band signal using the best microphone in each sub-band. The recovered speech signals using 7 microphones with 256 sub-bands are perfect when the reverberation time(RT) is less than 4.3s, is good enough for RT<0.85s, and is reasonably good for even RT=1.07s. The effects of the number of micro-phones and the size of the microphone array are also discussed.
Bibliographic reference. Wang, Hong / Itakura, Fumitada (1990): "Recovery of reverberated speech using multi-microphone sub-band envelope estimation", In ICSLP-1990, 305-308.