Title :
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
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;
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
DOI :
10.1109/MWSCAS.1995.510216
