Patent ID: 8090094
Filing Date: 2012-01-03
Classification: H04B,H04M

Abstract:
1. An echo canceller comprising: an adaptive filter which generates a pseudo echo signal in accordance with a far-end input signal; an echo cancellation means which subtracts the pseudo echo signal from a near-end input signal; a tone-kind judgment means which judges whether the far-end input signal is a predetermined kind of tone signal or not, said tone-kind judgment means when judging that the far-end input signal is a predetermined kind of tone signal, also detecting an end of the tone signal; an echo-cancellation-amount calculation means which calculates an amount of echo cancellation of a signal output from the echo cancellation means; and an at-tone-input coefficient control means which causes the adaptive filter to stop update of a coefficient of the adaptive filter in accordance with satisfaction of a predetermined condition for the amount of echo cancellation, when the tone-kind judgment means judges that the far-end input signal is the predetermined kind of tone signal, the at-tone-input coefficient control means