Patent ID: 7155018
Filing Date: 2006-12-26
Classification: H04M

Abstract:
1. An acoustic echo cancellation convergence detector, comprising: a center clipping component that receives an output of a differential component based, at least in part, upon a difference of an output of an adaptive filter and an output of an audio input device, the center clipping component further comparing the output of the differential component to a background noise level and providing an output of whether a frequency bin is center clipped; a convergence calculator that calculates a convergence parameter for a current frame of input data, the input data being based, at least in part, upon the output of the differential component; a convergence filter that filters the convergence parameter and outputs a filtered convergence parameter; a convergence statistic component that calculates a convergence statistic based, at least in part, upon at least one of the filtered convergence parameter and the convergence statistic for a previous frame of input data multiplied by a decay coefficient, the convergence statistic component further providing an output that identifies whether the adaptive filter is converged or diverged based, at least in part, upon the convergence statistic; and the convergence statistic being based upon the greater of the filtered parameter and the convergence statistic for the previous frame of input data multiplied by the decay coefficient.