DocumentCode :
1234179
Title :
A new configuration for echo canceller adaptable during double talk periods
Author :
Chao, Jinhui ; Tsujii, Shigeo
Author_Institution :
Dept. of Electr. Eng., Tokyo Inst. of Technol., Japan
Volume :
37
Issue :
9
fYear :
1989
fDate :
9/1/1989 12:00:00 AM
Firstpage :
969
Lastpage :
974
Abstract :
A three-port echo canceler (EC) configuration is proposed which observes the signal of the near-end side on a two-wire circuit in addition to the four-wire circuit signals. Embedding these signals on hybrid ports into a three-dimensional autoregressive process, echo path and innovations of near- and far-end speeches can be estimated through a three-channel lattice filter. The new configuration is then able to track echo path time variance, even during double talk (DT), and requires no changeover at either the beginning or end of DT, thus eliminating the need for DT detection. Two echo synthesizers utilizing inverse lattice and the echo path estimate possess guaranteed stability without the need for testing
Keywords :
echo suppression; filtering and prediction theory; autoregressive process; double talk periods; echo canceller; echo path time variance; hybrid ports; inverse lattice; lattice filter; three-port; Autoregressive processes; Circuits; Echo cancellers; Filters; Lattices; Signal processing; Speech processing; Stability; Synthesizers; Technological innovation;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/26.35377
Filename :
35377
Link To Document :
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