NDLI: Speech-and Network-Adaptive Layered G. 729 Coder for Loss Concealments of Real-Time Voice Over IP

Content Provider	IEEE Xplore Digital Library
Author	Sat, B. Wah, B.W.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Illinois Univ., Champaign, IL (Sat, B.; Wah, B.W.)
Abstract	In this paper, we propose a layered CELP speech coding (LC) scheme that adapts dynamically to the characteristics of the speech encoded and the network loss conditions in real time transmissions of voice over IP. Based on the ITU G.729 CS-ACELP codec operating at 8 Kbps, we design a variable bit-rate codec that is robust to losses and delays in IP networks. To cope with bursty losses while maintaining an acceptable end-to-end delay, our scheme employs LC with redundant piggybacking of perceptually important parameters in the base layer, with a degree of redundancy adjusted according to feedbacks from receivers. Under various delay constraints, we study trade-offs between the additional bit rate required for redundant piggybacking and the protection of perceptually important parameters. Experimental results show that our scheme works well and has quality comparable to full replication
Starting Page	1
Ending Page	4
File Size	4985349
Page Count	4
File Format	PDF
ISBN	0780392884
DOI	10.1109/MMSP.2005.248569
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-30
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Internet telephony Propagation losses Speech coding Speech codecs Robustness Delay effects IP networks Feedback Bit rate Protection
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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