In terms of speech recognition, two microphones are better than one, and sound waves reaching multiple microphones can exhibit varying degrees of time delay, which can be used to enhance the intensity of signals from a particular direction while reducing signals from other directions.
Researchers at the Amazon Alexa division have developed a novel acoustic modeling framework that enhances performance through unified speech enhancement and speech recognition. They used a dual-microphone system in their experiments, compared to systems that used seven microphones. They said the new system reduced the error rate of speech recognition by 9.5%.
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