Patent ID: 6990083

Claim:
A method of calculating echo-canceling (EC) coefficients to be used by an echo cancellation filter in a communication modem, the communication modem having a Fast Fourier Transform (FFT) serial to parallel interface, the method comprising the steps of: transmitting a first signal including a wide-band cyclic sequence; generating an echo signal based on said first signal and a plurality of EC coefficients; receiving a second signal including a wide-band cyclic sequence; subtracting the echo-canceled signal from said second signal to produce an echo-cancelled signal; transforming the echo-cancelled signal via said FFT serial to parallel interface to produce a transformed echo-cancelled signal; calculating said plurality of EC coefficients based on said transformed echo-cancelled signal; and providing at least one control signal to control the timing of said transmitting step so that said calculating step is performed for predesignated first signals.