Detecting loss of echo cancellation

Coherent light generators – Particular beam control device – Optical output stabilization

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379410, H04B 323

Patent

active

052068544

ABSTRACT:
In a full-duplex modem, correlation of an echo estimate signal with an echo-canceled signal is used to determine the presence or absence of a remote signal.

REFERENCES:
patent: 4707824 (1987-11-01), Kanemasa
patent: 4769808 (1988-09-01), Kanemasa

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