Bandwidth adjustment based on dynamic differential pulse code modulation

Leann M. Christianson; Kevin A. Brown

doi:10.1117/12.333733

16 December 1998 Bandwidth adjustment based on dynamic differential pulse code modulation

Leann M. Christianson, Kevin A. Brown

Proceedings Volume 3529, Internet Routing and Quality of Service; (1998) https://doi.org/10.1117/12.333733
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

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.

Citation Download Citation

Leann M. Christianson and Kevin A. Brown "Bandwidth adjustment based on dynamic differential pulse code modulation", Proc. SPIE 3529, Internet Routing and Quality of Service, (16 December 1998); https://doi.org/10.1117/12.333733

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