NDLI: Adaptive electrical echo canceller for telephone networks

Content Provider	IEEE Xplore Digital Library
Author	Oyerinde, O.O. Yesufu, T.K.
Copyright Year	2005
Description	Author affiliation: Dept. of Electron. & Electr. Eng., Obafemi Awolowo Univ., Ile-Ife, Nigeria (Oyerinde, O.O.; Yesufu, T.K.)
Abstract	Echo in telephones is generally undesirable but inevitable. Impedance mismatch and acoustic coupling between the receiver and microphone circuit(s) respectively produce electric and acoustic echoes in a telephone network. There is therefore a need to develop an echo canceller that can be used to reduce these echoes in telephone networks. In this work, a model for electrical echo in telephone networks for varied echo-path delay was designed. This was with a view to implementing an adaptive electrical echo canceller based on a combination of the normalized least mean square (NLMS) and Geigel speech detector algorithms (GSD). Subsequently, the performance indices (convergence rate and efficiency) of the echo canceller implemented were obtained using error function, echo return loss enhancement (ERLE) and the mean squared error (MSE) for various echoes with varied round-trip delay according to the minimum requirement of ITU-T (International Telecommunication Union) Recommendations. The results obtained show that there was a 3 dB improvement over the NLMS algorithm. The developed adaptive electrical echo canceller is therefore suitable for reduction of echoes in telephone networks.
Starting Page	3200
Ending Page	3205
File Size	370048
Page Count	6
File Format	PDF
ISBN	0780393937
DOI	10.1109/MILCOM.2005.1606149
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Echo cancellers Telephony Impedance Coupling circuits Microphones Speech Detectors Performance loss Convergence Delay
Content Type	Text
Resource Type	Article

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