Acoustic echo canceller for teleconferencing systems using Levinson algorithm

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Sainath Maddala, Y Maheswar
Title: Acoustic echo canceller for teleconferencing systems using Levinson algorithm
Conference name: International Conference on "Emerging Trends in Robotics and Communication Technologies
Year: 2010
ISBN: 978-142449006-6
Publisher: IEEE
City: Chennai
URI/DOI: 10.1109/INTERACT.2010.5706207
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
Language: English
Abstract: In teleconferencing systems, there are disturbing effects of acoustic echo which hinder the quality of the sound from the loudspeakers. This paper presents an optimization technique to attenuate the acoustic echoes generated due to coupling between the microphone and the loudspeaker. An optimal filter is designed based on a least squares technique. It uses Levinson algorithm to equalize the acoustic channel in an iterative manner by calculating the correlation coefficients needed for updating the iterations, in order to minimize the echo effect. The method calculates the optimal solution directly with less data recorded. The performance was validated and compared with adaptive filtering technique using a real time signal from a conference room
Subject: Signal Processing\Speech Enhancement
Keywords: Acoustic echo cancellation(AEC), Loudspeaker, Teleconferencing