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Robust digit recognition using phase-dependent time-frequency masking

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2 Author(s)
Guangji Shi ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada ; Aarabi, P.

A technique using the time-frequency phase information of two microphones is proposed to estimate an ideal time-frequency mask using time-delay-of-arrival (TDOA) of the signal of interest. At a signal-to-noise ratio (SNR) of 0dB, the proposed technique using two microphones achieves a digit recognition rate (average over 5 speakers, each speaking 20-30 digits) of 71%. In contrast, delay-and-sum beamforming only achieves a 40% recognition rate with two microphones and 60% with four microphones. Superdirective beamforming achieves a 44% recognition rate with two microphones and 65% with four microphones.

Published in:

Multimedia and Expo, 2003. ICME '03. Proceedings. 2003 International Conference on  (Volume:3 )

Date of Conference:

6-9 July 2003