NDLI: Accuracy of MP3 speech recognition under real-word conditions: Experimental study

Content Provider	IEEE Xplore Digital Library
Author	Pollak, P. Behunek, M.
Copyright Year	2011
Description	Author affiliation: Fac. of Electr. Eng., Czech Tech. Univ. in Prague, Prague, Czech Republic (Pollak, P.; Behunek, M.)
Abstract	This paper presents the study of speech recognition accuracy with respect to different levels of MP3 compression. Special attention is focused on the processing of speech signals with different quality, i.e. with different level of background noise and channel distortion. The work was motivated by possible usage of ASR for offline automatic transcription of audio recordings collected by standard wide-spread MP3 devices. The realized experiments have proved that although MP3 format is not optimal for speech compression it does not distort speech significantly especially for high or moderate bit rates and high quality of source data. The accuracy of connected digits ASR decreased consequently very slowly up to the bit rate 24 kbps. For the best case of PLP parameterization in close-talk channel just 3% decrease of recognition accuracy was observed while the size of the compressed file was approximately 10% of the original size. All results were slightly worse under presence of additive background noise and channel distortion in a signal but achieved accuracy was also acceptable in this case especially for PLP features.
Sponsorship	INSTICC
Starting Page	1
Ending Page	6
File Size	96006
Page Count	6
File Format	PDF
ISBN	9789898425720
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-18
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	INSTICC
Subject Keyword	Training MP3 Accuracy MPEG compression Hidden Markov models Speech recognition Speech Noise robustness Mel frequency cepstral coefficient Digital audio players Channel distortion
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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