Patent ID: 7177416
Filing Date: 2007-02-13
Classification: H04M

Abstract:
1. An acoustic echo canceller comprising: an adaptive filter operative to receive a reference signal and a near-end signal, to cancel a portion of echo in the near-end signal using the reference signal, and to provide an intermediate signal having remaining echo not canceled by the adaptive filter; a post filter operative to determine cross-correlation between the near-end signal and the intermediate signal, to derive a variable suppression parameter based on the cross-correlation between the near-end signal and the intermediate signal, and to derive a set of time domain coefficients based on the near-end signal, the intermediate signal, and the variable suppression parameter, the set of time domain coefficients being suitable for further suppressing the remaining echo in the intermediate signal; and an adjustable filter operative to filter the intermediate signal based on the set of time domain coefficients and to provide an output signal having at least a portion of the remaining echo removed.