Robust acoustic echo cancellation

摘要

An acoustic echo canceller (AEC) system may be configured to reset the coefficients of a transform equation when an estimated echo diverges from actual acoustic echo. Features are disclosed for determining when to reset the coefficients, and for enabling the reset operation to be performed reliably. Additional features are disclosed for detecting other signal conditions besides AEC divergence, for adjusting the rate at which the coefficients are adapted in response to such conditions, and for prioritizing between potentially incompatible adjustments.

主权项

1. A method of controlling an acoustic echo canceller (AEC), the method comprising:
receiving a far-end signal; receiving a microphone signal comprising an actual echo of the far-end signal; calculating an estimated echo based on the far-end signal and a set of adaptive coefficients; detecting divergence of the estimated echo from the actual echo in a first frame; resetting the adaptive coefficients to previously stored values, based at least in part on the detected divergence of the estimated echo from the actual echo in the first frame; detecting, in a second frame, signal condition information comprising at least one of echo path change, microphone signal inactivity, far-end signal inactivity, microphone signal distortion, double talk, or far-end signal tonality; and determining a rate of adaptation for the adaptive coefficients based on the signal condition information.