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Untethered Distant Speech-to-Text Transcription Using Arrays of Directional Microphones

This paper considers distant speech recognition in meeting rooms where the microphone cannot be placed on the table directly in front of a speaker. Two solutions are considered for obtaining sufficient audio quality for speech recognition: an array of shotgun microphones distant from the speakers and an array of hanging (overhead) microphones which can be placed closer to the speakers. Shotgun microphones are typically considered as alternatives to microphone arrays, but in this paper we consider their use as elements in an actual microphone array. Due to their high directivity they provide improved Signal to Noise Ratio (SNR), less distortion and higher word accuracy rate from a speech recogniser than arrays using standard gooseneck cardioid microphone elements.