The echo shaping approach to acoustic echo control

Authors:

Martin, R. ,  Gustafsson, S.

Journal:

(SpCom)

Volume:

20

Page(s):

181-190

number:

3-4

Date:

Dec. 1996

Language:

English

Abstract

This paper describes and analyses algorithms for hands-free telephony which use an acoustic echo canceller combined with an additional FIR-filter in the sending path of the hands-free telephone. We describe two different methods to adapt the additional FIR filter (called "the echo shaping filter") which are higly effective and easy to implement. It is shown that these algorithms allow to reduce the order of the compensator significantly and still provide high echo attenuation and only little distorsions of the near speech signal during double talk.

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