NDLI: On improving voice quality under dynamic encoding algorithms in ATM networks

Content Provider	IEEE Xplore Digital Library
Author	Rubin, I. Chang, K.K.
Copyright Year	1995
Description	Author affiliation: Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA (Rubin, I.)
Abstract	We consider a voice multiplexer which supports ATM packet voice traffic. This system model also applies to the multiplexing operation carried out at the output queue of each output queueing ATM switch. The voice multiplexer implements an encoding algorithm under which the voice quantization levels are dynamically adjusted according to the congestion status of the multiplexer. Using an embedded voice encoding scheme, a voice packet is encoded into lower and higher priority ATM cells. When high congestion conditions are observed, lower priority voice cells (which contain the least significant bits) are discarded. In previous studies, the voice quality under a dynamic encoding algorithm has been described by the long-term average voice encoding rate (AER/sub /spl infin//). Due to the strong correlation properties exhibited by the packet voice traffic, the voice degradation levels incurred under the employed dynamic voice encoding algorithms are not distributed uniformly among the voice sources. As a result, the encoded voice stream for a source can exhibit severe short-term voice quality degradation, while the long-term AER/sub /spl infin// level remains satisfactory. To correct this situation, we introduce in this paper a "probabilistic" component in the cell-discarding process. A voice degradation indicator (VDI) is introduced to measure the short-term voice quality degradation experienced by a voice stream. Through numerical examples, we identify and compare the system performance under the deterministic and probabilistic algorithms. Under the same AER/sub /spl infin// levels, a probabilistic algorithm is shown to yield better short-term voice quality behavior as well as to improve the mean cell waiting time performance.
Starting Page	9
Ending Page	15
File Size	636734
Page Count	7
File Format	PDF
ISBN	0818670754
DOI	10.1109/SCAC.1995.523176
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-07-27
Publisher Place	Egypt
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Encoding Heuristic algorithms Asynchronous transfer mode Degradation Multiplexing Traffic control Switches Telecommunication traffic Quantization System performance
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