Communication system for controlling training of echo...

Details Communication system for controlling training of echo... Communication system for controlling training of echo...

2005-09-20

2005-09-20

Tran, Sinh (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406020, C379S405000, C379S406050, C379S406070, C379S406080, C379S406090

Reexamination Certificate

active

06947553

ABSTRACT:
A communication system being made up of a two-wire/four-wire hybrid circuit, an echo canceller, and a control device and having functions of forming a plurality of communication paths and changing communication paths is provided which is capable of ensuring high speech quality by suppressing and canceling an echo occurring in telephone speech after establishment of path connection. The communication system also includes a training signal source to feed a training signal to the echo canceller, a switching circuit to do switching of a signal to be fed to the echo canceller between an ordinary signal and the training signal, and a control device to exert control on path connection and path changing and to feed the training signal to the switching circuit to make a training signal be fed from the training signal source to the echo canceller and to have the echo canceller converge its training operation.

REFERENCES:
patent: 5414763 (1995-05-01), Hirata
patent: 5740242 (1998-04-01), Hayashi
patent: 6147979 (2000-11-01), Michel et al.
patent: 3-188718 (1991-08-01), None

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