In terms of speech recognition
are better than one, and sound waves
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%.