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Detection and Discrimination of Double Talk and Echo Path Changes in a Telephone Channel
Royal Institute of Technology.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
1998 (English)In: Signal Analysis and Prediction / [ed] A. Prochazka and J. Uhlir and P.J.W. Rayner and N.G. Kingsbury, Springer , 1998, 407-418 p.Chapter in book (Other academic)
Abstract [en]

It is important to detect a change in the echo path quickly but not confuse it with double talk, since the echo canceler should react differently for these two phenomena. In this chapter, a sequential detection scheme is presented and, based on model assumptions, the maximum a posteriori probabilities of the occurrence of double talk and abrupt changes in the echo path are derived. By utilizing the fact that the most active part of a typical impulse response of a telephone channel is short and by using a low complexity time-delay estimation algorithm to find these most active taps and not estimating the rest of the taps, low computational complexity of the proposed detection method is achieved. The scheme is veried experimentally in computer simulations using a real speech signal and impulse responses created from measured impulse responses from real hybrids of a telephone channel.

Place, publisher, year, edition, pages
Springer , 1998. 407-418 p.
Keyword [en]
Echo path, Sequential detection scheme, Time-delay estimation algorithm, Simulations
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-56327ISBN: 0-8176-4042-8 (print)ISBN: 9780817640422 (print)OAI: oai:DiVA.org:liu-56327DiVA: diva2:318446
Available from: 2010-05-07 Created: 2010-05-07 Last updated: 2013-09-25

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Gustafsson, Fredrik

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