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Implementation of Acoustic Echo Cancellation for PC Applications using Matlab
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
2007 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

The communication technique has changed a lot in the recent years. Today people aremore interested in hands-free communication with the use of a loudspeaker and amicrophone, in stead of a normal telephone. However, the presence of a large acousticcoupling between the loudspeaker and microphone would produce a loud echo that wouldmake conversation difficult. The solution to these problems is the elimination of the echowith an echo cancellation or echo suppression algorithm. However, traditional methodsare not sufficient.

The objective of this thesis is to find out a good echo removal algorithm, which iscapable of providing convincing results for PC application. The basic components of anecho canceller are an adaptive filter, and a double-talk detector. The adaptive filterestimates the echo path, based on which a replica of the echo is created and subtractedfrom the combination of the actual echo and the near-end speech signal. Double talkoccurs when both ends are talking. The task of a doubletalk detector is to sense thedoubletalk, so that to stop the adaptive filter in order to avoid divergence. Since there hasbeen a revolution in the field of personal computers in recent years, this work attempts toimplement the acoustic echo canceller algorithm on a PC with the help of the MATLABsoftware.

Place, publisher, year, edition, pages
Stockholm, Sweden, 2007.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-12674OAI: diva2:318205
QC 20100707. ICT/ECS-2007-63Available from: 2010-07-07 Created: 2010-05-05 Last updated: 2010-07-07Bibliographically approved

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