Separation circuit for an echo canceling system and method...

Details Separation circuit for an echo canceling system and method... Separation circuit for an echo canceling system and method...

2005-05-17

2005-05-17

Lee, Andy (Department: 2663)

Multiplex communications

Duplex

Transmit/receive interaction control

C370S290000, C379S406050, C379S406060, C375S222000

Reexamination Certificate

active

06894989

ABSTRACT:
A separation circuit, method of determining a residual level of an echo, and an echo canceling system, bit pump and transceiver employing the circuit and method. The echo canceling system employing the separation circuit is couplable between a transmit and receive path of the bit pump and generates an echo canceling signal. In one embodiment, the separation circuit includes a symbol determination circuit that accepts a receive signal, propagating along the receive path, substantially free of an echo and determines a symbol associated with the receive signal. The separation circuit also includes an estimator stage, coupled to the symbol determination circuit, that receives the symbol and provides an estimated receive signal. The separation circuit generates data representing a residual level of the echo as a function of the estimated receive signal and the echo canceling signal.

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