NDLI: Speech coder using phase equalization and vector quantization

Content Provider	IEEE Xplore Digital Library
Author	Moriya, T. Honda, M.
Copyright Year	1986
Description	Author affiliation: NTT Electrical Communications Laboratories, Tokyo, Japan (Moriya, T.)
Abstract	A new speech processing and coding method is proposed which makes use of perceptual redundancy for slowly varying short-time phase characteristics. The method employs waveform conversion through a phase-equalizing filter, which is based on the time domain matched filter for the residue of Linear Predictive Coding (LPC). Phase-equalized speech is found to be almost perceptually equivalent and to be efficiently encoded by a two-stage quantization. In the first stage, vector quantization is performed for the pulse pattern in the time domain. In the second stage, vector-scalar quantization is applied to the spectral components using adaptive bit allocation. The proposed coder is proven to be superior to other coders both in terms of the SNR and the subjective quality. The averaged subjective quality at 9.6 kbps is comparable to that of a 6 bit log PCM.
Starting Page	1701
Ending Page	1704
File Size	129683
Page Count	4
File Format	PDF
DOI	10.1109/ICASSP.1986.1169253
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-04-07
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vector quantization Linear predictive coding Matched filters Bit rate Decoding Speech processing Data compression Filtering Speech analysis Speech synthesis
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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