An adaptive echo canceller for the transmission of compressed telephone voice

Author

Negreiros, Marcelo ; Suzim, Altamiro A. ; Weihmann, Thomas

Author_Institution

Lab. de Instrumentacao Eletro-Eletronica, Porto Alegre, Brazil

Volume

2

fYear

1995

fDate

13-16 Aug 1995

Firstpage

827

Abstract

An adaptive echo canceller for the transmission of compressed telephone voice in a digital link is presented. The system is based on a TMS320C25. Measures of echo canceller performance for the running system are made and results are compared to CCITT recommendation G.165. The echo attenuation measured is noted to depend on the nature of the test signal used. It is verified that the codification and transmission processes degrade the level of echo attenuation for the system in operation

Keywords

FIR filters; adaptive filters; data compression; digital communication; echo suppression; speech coding; voice communication; CCITT recommendation G.165; TMS320C25; adaptive echo canceller; codification; compressed telephone voice; digital link; running system; test signal; transmission processes; Acoustic testing; Adaptive filters; Attenuation measurement; Circuits; Decoding; Echo cancellers; Finite impulse response filter; System testing; Telephony; Transversal filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1995., Proceedings., Proceedings of the 38th Midwest Symposium on

Conference_Location

Rio de Janeiro

Print_ISBN

0-7803-2972-4

Type

conf

DOI

10.1109/MWSCAS.1995.510216

Filename

510216