NDLI: A multi-mode variable rate speech coder for CDMA cellular systems

Content Provider	IEEE Xplore Digital Library
Author	Tanaka, N. Morii, T. Yoshida, K. Homma, K.
Copyright Year	1996
Description	Author affiliation: Telecom Res. Lab., Matsushita Commun. Ind. Co. Ltd., Yokohama, Japan (Tanaka, N.)
Abstract	This paper presents a multi-mode variable rate speech coder based on the CELP algorithm. The coder operates at a rate of 8.5 kbps, 4 kbps or 0.8 kbps with a 20 ms frame. The coder consists of five coding modes applied to distinct speech features. One out of the five coding modes is selected for each frame by using a mode selector which comprises a neural network and a speech power variation detector. To improve the coding performance, an inter-frame predictive LSP quantizer and a coding strategy for speech onsets are utilized. In low bit-rate speech coding, decoded speech quality is severely degraded in high background noise. A noise suppressor based on the spectral subtraction algorithm is also introduced in order to reduce background noises. We proposed this coder as a candidate for a new speech service standard of the North American CDMA digital cellular system IS-95. As a result of the first evaluation conducted by the Telecommunications Industry Association, the coder got the highest overall score on the tests in speech quality and average data rate.
Starting Page	198
Ending Page	202
File Size	452598
Page Count	5
File Format	PDF
ISBN	0780331575
ISSN	10903038
DOI	10.1109/VETEC.1996.503436
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-04-28
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Speech coding Background noise Neural networks Detectors Decoding Speech enhancement Degradation Noise reduction Code standards
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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