Echo canceller employing H-register and storage register

Details Echo canceller employing H-register and storage register Echo canceller employing H-register and storage register

2003-05-28

2008-08-05

Tse, Young T. (Department: 2611)

Multiplex communications

Duplex

Transmit/receive interaction control

C370S286000, C379S406010, C379S406080

Reexamination Certificate

active

07408891

ABSTRACT:
An echo canceller comprising a digital filter having adaptive coefficients which are updated to simulate an echo response, a temporary register for storing default coefficients, and a controller for monitoring ERLE and in the event the ERLE is greater than a first predetermined threshold then enabling the digital filter and replacing the default coefficients in the temporary register with the adaptive coefficients, and in the event the ERLE is less than a second predetermined threshold then disabling the digital filter and replacing the adaptive coefficients with said the default coefficients from the temporary register.

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