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Summary: IEEE TRANSACTIONS ON SYSTEMS, MAN, AND CYBERNETICS--PART B: CYBERNETICS, VOL. 34, NO. 4, AUGUST 2004 1763
Phase-Based Dual-Microphone
Robust Speech Enhancement
Parham Aarabi, Member, IEEE, and Guangji Shi
Abstract--A dual-microphone speech-signal enhancement algo-
rithm, utilizing phase-error based filters that depend only on the
phase of the signals, is proposed. This algorithm involves obtaining
time-varying, or alternatively, time-frequency (TF), phase-error
filters based on prior knowledge regarding the time difference of
arrival (TDOA) of the speech source of interest and the phases
of the signals recorded by the microphones. It is shown that by
masking the TF representation of the speech signals, the noise com-
ponents are distorted beyond recognition while the speech source of
interest maintains its perceptual quality. This is supported by digit
recognition experiments which show a substantial recognition ac-
curacy rate improvement over prior multimicrophone speech en-
hancement algorithms. For example, for a case with two speakers
with a 0.1 s reverberation time, the phase-error based technique re-
sults in a 28.9% recognition rate gain over the single channel noisy
signal, a gain of 22.0% over superdirective beamforming, and a
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