NDLI: A 4 kb/s hybrid MELP/CELP coder with alignment phase encoding and zero-phase equalization

Content Provider	IEEE Xplore Digital Library
Author	Stachurski, J. McCree, A.
Copyright Year	2000
Description	Author affiliation: DSP Solutions R&D Center, Texas Instrum., Dallas, TX, USA (Stachurski, J.)
Abstract	The paper describes a hybrid multi-modal codec with MELP and CELP coders used for different speech regions. Three modes are used: strongly voiced, weakly voiced, and unvoiced. The weakly voiced mode includes transitions and plosives; it is used when neither strong voicing nor unvoiced region are clearly identified. In the strongly voiced mode the MELP coder is used, while in the weakly voiced and unvoiced modes the CELP coder is employed. To limit switching artifacts between the coders, alignment phase is estimated and transmitted in the MELP mode making the original and MELP-synthesized speech time-synchronous. Additionally, in zero-phase equalization, the phase component of the CELP target signal is removed making the target waveform more similar to the MELP-synthesized speech. These two techniques, alignment-phase encoding and zero-phase equalization, greatly reduce switching artifacts in MELP/CELP transition regions. Formal listening test results of the 4 kb/s hybrid coder show that it can achieve speech quality equivalent to 32 kb/s ADPCM.
Starting Page	1379
Ending Page	1382
File Size	430287
Page Count	4
File Format	PDF
ISBN	0780362934
ISSN	15206149
DOI	10.1109/ICASSP.2000.861837
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-05
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Encoding Speech synthesis Signal synthesis Shape Phase estimation Switches Digital signal processing Research and development Instruments Electronic mail
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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