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Speech enhancement for mobile telephony

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2 Author(s)
M. M. Goulding ; Sch. of Eng., Simon Fraser Univ., Burnaby, BC, Canada ; J. S. Bird

The properties of noise fields in automobile interiors are discussed with a view toward speech enhancement for voice-activated mobile telephony. The limitations on performance of adaptive noise cancellation are explained in the context of the spatial correlation properties of the noise field. A simple delay-equalized near-field array of directional microphones is analyzed and found to be effective for increasing the signal-to-noise density ratio (SNR) and reducing the reverberant distortion of the speech, without introducing any further distortion. An array of N microphones, each with a delay and weight chosen according to its distance from the speech source, is a viable solution. Such an array gives gains on the order of N over the speech band, reduces reverberation, and does not introduce waveform distortion. Experimental results confirming the predicted performance are presented

Published in:

IEEE Transactions on Vehicular Technology  (Volume:39 ,  Issue: 4 )