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Dual-Microphone Robust Front-End for Arm's-Length Speech Recognition
- Author(s)
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- Holly Francois, (Motorola)
- David Pearce, (Motorola)
- James Rex, (Motorola)
- Topics
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- Noise reduction techniques
- Microphone arrays and array signal processing
- Sound enhancement and sound separation
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Abstract
This paper describes a novel method of improving speech recognition performance in non-stationary background noise. A two-microphone array both enhances speech and provides a continuous estimate of background noise. This processing is integrated with the ETSI standard Advanced Front-End for Distributed Speech Recognition, with the continuous noise estimate being used to design the first-stage Wiener filter. This increases noise suppression and hence reduces recognition error rate by up to 50% compared with single-microphone input.
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