Patent ID: 6856684

Claim:
Method for echo compensation with a common-frequency transmission method in duplex mode over a two-wire line for transmission of data with different data rates in the transmission and reception directions, the method comprising having the following stops: (a) calculating filter coefficients of an IIR filter as a function of the filter coefficients of a first FIR echo compensation filter; (b) adjusting the IIR filter in accordance with the calculated filter coefficients; (c) filtering a transmitter output signal by means of said first FIR echo compensation filter; (d) subtracting the FIR-filtered transmitter output signal from a receiver input signal; (e) filtering the FIR-filtered output signal by means of said adjusted IIR filter; (f) subtracting the FIR-filtered signal from said receiver in put signal; (g) wherein, when there is a high data rate in transmission direction and a low data rate in reception direction, performing a corresponding decimation of the IIR-filtered signal by means of a first decimation device; and (h) wherein, when there is a low data rate in transmission direction and a high data rate in reception direction, performing interpolation of the transmitter output signal upstream of the first FIR echo compensation filter by means of a first interpolation device.