Patent ID: 7403608

Claim:
An echo processing device for attenuating echo components of a direct signal X 1 n in a return signal Y 2 n , said device comprising: means for calculating a receive gain Gr n and a send gain Ge n ; first gain application means for applying the receive gain Gr n to the direct signal and producing an input signal X 2 n emitted into an echo generator system; second gain application means for applying the send gain Ge n to an output signal Y 1 n from the echo generator system and producing the return signal Y 2 n ; and means for obtaining a coupling variable COR characteristic of the acoustic coupling between the direct signal X 1 n or the input signal X 2 n and the output signal Y 1 n , by calculating a correlation between the direct signal X 1 n or the input signal X 2 n and the output signal Y 1 n; wherein said gain calculation means is configured to calculate the receive gain Gr n and the send gain Ge n based on said coupling variable.