Signal detector with echo cancellation

Details Signal detector with echo cancellation Signal detector with echo cancellation

H - Electricity

04

M

H04M 3/436 (2006.01) H04B 3/23 (2006.01) H04M 1/57 (2006.01) H04M 3/48 (2006.01)

Patent

CA 2372863

A system is disclosed for accurately detecting an alert signal. Improving detector accuracy decreases missed detects and false detects. In one example embodiment the detector monitors received telephone signals for an alert signal such as a CPE alert signal. In such a configuration, the invention processes the received signal prior to monitoring by the detector to remove or reduce unwanted echo, interference and/or other signal portions that may otherwise inhibit accurate detection of alert signals sent from a remote location. In one configuration; the invention performs echo suppression or cancellation on the received signal to eliminate or reduce echo, such as may be introduced by a hybrid.

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