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Proceedings Paper

Bandwidth adjustment based on dynamic differential pulse code modulation
Author(s): Leann M. Christianson; Kevin A. Brown
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Paper Abstract

This paper describes an application in which speech coding and resultant bandwidth usage is dynamically adapted to available network bandwidth. Network feedback concerning available bandwidth and current load is provided by the statistics generated by the real-time protocol which is used to support many audio and video applications running on the Multicast Backbone. This feedback is evaluated and used to control the speech encoding and adaptation. Speech segments are encoded to 16, 12, 10, 8 or 4 bit samples depending on network traffic conditions. Fewer bits are used when current network conditions show a reduction in available bandwidth, and additional bits are used when bandwidth is plentiful. Bit reduction lowers the amount of bandwidth needed to transmit the audio samples, and subsequently, fewer audio data packets are lost. Listening tests were performed to evaluate perceptual quality and to establish an acceptable maximum loss rate and minimum encoding rate.

Paper Details

Date Published: 16 December 1998
PDF: 8 pages
Proc. SPIE 3529, Internet Routing and Quality of Service, (16 December 1998); doi: 10.1117/12.333733
Show Author Affiliations
Leann M. Christianson, California State Univ./Hayward (United States)
Kevin A. Brown, California State Univ./Hayward (United States)

Published in SPIE Proceedings Vol. 3529:
Internet Routing and Quality of Service
Raif O. Onvural; Seyhan Civanlar; Paul J. Doolan; Seyhan Civanlar; Paul J. Doolan; James V. Luciani; James V. Luciani, Editor(s)

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