Abstract
An acoustic echo canceller comprising an adaptive filter, a post filter, and an adjustable filter. The adaptive filter receives a reference signal and a near-end signal, cancels a portion of the echo in the near-end signal using the reference signal, and provides an intermediate signal having remaining echo not canceled by the adaptive filter. The post filter calculates the cross-correlation between the near-end signal and intermediate signal, and provides a set of coefficients based on a variable suppression parameter. The adjustable filter processes the intermediate signal based on the coefficients and provides an output signal having at least a portion of the remaining echo removed. The acoustic echo canceller may further comprise a channel control unit that provides control signals, an adjustable amplifier, a noise estimator that estimates the noise in the intermediate signal, and a noise reinsertion unit that reinserts a version of the estimated noise back into the output signal.
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