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An adaptive multi-microphone speech enhancement method and system

IP.com Disclosure Number: IPCOM000020624D
Original Publication Date: 2003-Dec-04
Included in the Prior Art Database: 2003-Dec-04

Publishing Venue

IBM

Abstract

The problem which is considered is that of improving the intelligibility and/or perceived quality of a speech signal of interest corrupted by additive random noise. Systems for speech enhancement have many application: in hearing aids, in mobile communication systems, as the front-end of automatic speech recognition (ASR) systems in order to increase their effectiveness, to name just a few of them. The new system uses a method which maximally reduces background noise, while improving speech intelligibility by using N synchronous speech-plus-noise recordings from an array of N microphones. The system is theoretically capable of suppressing N-1 point noise sources (along with their acoustic reflections) by using N microphones and is especially applicable in very poor signal-to-noise-ratio (SNR) conditions (below 0 dB).