NDLI: A digital microphone array for distant speech recognition

Content Provider	IEEE Xplore Digital Library
Author	Zwyssig, E. Lincoln, M. Renals, S.
Copyright Year	2010
Description	Author affiliation: Centre for Speech Technology Research, University of Edinburgh, EH8 9AB, Scotland UK (Zwyssig, E.; Lincoln, M.; Renals, S.)
Abstract	In this paper, the design, implementation and testing of a digital microphone array is presented. The array uses digital MEMS microphones which integrate the microphone, amplifier and analogue to digital converter on a single chip in place of the analogue microphones and external audio interfaces currently used. The device has the potential to be smaller, cheaper and more flexible than typical analogue arrays, however the effect on speech recognition performance of using digital microphones is as yet unknown. In order to evaluate the effect, an analogue array and the new digital array are used to simultaneously record test data for a speech recognition experiment. Initial results employing no adaptation show that performance using the digital array is significantly worse (14% absolute WER) than the analogue device. Subsequent experiments using MLLR and CMLLR channel adaptation reduce this gap, and employing MLLR for both channel and speaker adaptation reduces the difference between the arrays to 4.5% absolute WER.
Starting Page	5106
Ending Page	5109
File Size	180808
Page Count	4
File Format	PDF
ISBN	9781424442959
ISSN	15206149
DOI	10.1109/ICASSP.2010.5495040
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-03-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microphone arrays Speech recognition Micromechanical devices Automatic speech recognition Costs Pulse amplifiers Instruments Acoustic devices Signal processing Analog-digital conversion MEMS microphone digital microphone array speech recognition WSJCAM0
Content Type	Text
Resource Type	Article

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