Proceedings of the 3rd International Conference on Measurement of Speech and Audio Quality in Networks, Prague, Czech Republic, May 2004.

A Bottom-Up Algorithm for Estimating Time-Varying Delays in Coded Speech

S. Voran

Abstract: In packetized speech transmission, end–to–end delay can vary, even over short timescales. Estimating the resulting speech delay histories is critical to diagnostic and quality estimation efforts. We present a new bottom–up algorithm for estimating time–varying speech delays. The bottom–up approach is well–suited to real–time implementation. The algorithm works with very low–rate codecs as well as the higher–rate codecs that are more common in VoIP applications. We describe the new algorithm in some detail and provide descriptions of the databases and techniques used to develop and test the new algorithm.

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Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
LSegre@ntia.gov

For technical information concerning this report, contact:

Stephen D. Voran
Institute for Telecommunication Sciences
(303) 497-3839
svoran@ntia.doc.gov

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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