NDLI: Echo cancellation in IP networks

Content Provider	IEEE Xplore Digital Library
Author	Radecki, J. Zilic, Z. Radecka, K.
Copyright Year	2002
Description	Author affiliation: Atsana Networks, Ottawa, Ont., Canada (Radecki, J.)
Abstract	Voice transmission over IP networks imposes new DSP challenges. Package loss and latency caused by packet buffering have the fundamental influence on the speech quality. These features have also an impact on the line echo canceller (EC) performance. The constant latency greater than 60 milliseconds usually causes that an echo is very well audible even for a short echo path delay. Therefore, the EC must be deployed on each 2-wire/4-wire connection while on a conventional transmission only toll connections require EC. Such a large total delay requires short convergence time and sufficient Echo Return Loss Enhancement (ERLE). Further, package loss that is related to non-stationary intervals of speech imposes stringent requirements on EC performance in tracking statistical variations of the signal. Overally, IP telephony requires more robust and less expensive EC than conventional networks. In this paper we address the basic design issues in the EC for IP telephony. We show that classical Least Mean Square (LMS) algorithms are rather inappropriate and offer an alternative solution.
Sponsorship	IEEE Circuits & Syst. Soc. School of Electr. & Comput. Eng. at Oklahoma State Univ
File Size	298133
File Format	PDF
ISBN	0780375238
DOI	10.1109/MWSCAS.2002.1186837
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Echo cancellers IP networks Packaging Speech Telephony Digital signal processing Delay effects Convergence Propagation losses Performance loss
Content Type	Text
Resource Type	Article

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