How to improve acoustic echo and noise cancelling using a single talk detector

Author(s): Faucon, G., Ayad, B.

Journal/Book: Speech Commun. 1996; 20: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science BV. 191-202.

Abstract: This paper deals with speech enhancement for hands-free audio terminals, including two major problems: noise reduction and acoustic echo cancellation. Our objective is to combine a noise reduction system and an acoustic echo canceller to get a near-end speech signal with a minimum distortion and low levels of echo and noise. We present four structures (using one or two microphones and one loudspeaker) where the operation of echo cancellation comes before that of noise reduction. Generally, the noise reduction system is derived from the output of the acoustic echo canceller. An alternative is to derive the noise reduction directly from the microphone observation in order to decrease the distortion on the near-end speech signal. Experimental results are presented. Finally, in the mono-channel situation, an optimized structure controlled by an echo detector is proposed and tested.

Note: Article Faucon G, Univ Rennes 1, Lab Traitement Signal & Image, Batiment 22, Campus Beaulieu, F-35042 Rennes, FRANCE

Keyword(s): acoustic echo cancellation; noise reduction; mobile communications

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