Patent ID: 7203308
Filing Date: 2007-04-10
Classification: H04B,H04M

Abstract:
1. An echo canceller comprising: an echo cancellation part canceling echo included in a near-end input signal to the echo canceller, the near-end input signal including an echo component of a far-end input signal to the echo canceller; a noise suppression part employing a low-pass filter having a variable cut-off frequency adaptive to power of an input signal, the noise suppression part removing a residual echo component from an output of said echo cancellation part; a threshold generation part generating a variable threshold varying in accordance with a power level of the far-end input signal; a determination part making a determination based on a comparison between a power level of the output of said echo cancellation part and the variable threshold; and a processing part performing noise suppression using the low-pass filter on the output of said echo cancellation part when said determination part determines that the power level of the output of said echo cancellation part is lower than or equal to the variable threshold.