Patent ID: 8953777
Filing Date: 2015-02-10
Classification: H04B,H04M

Abstract:
1. A method of controlling the rate of adaptation in an acoustic echo canceller, the method comprising: determining a microphone energy from a microphone signal, an acoustic echo canceller output energy from an acoustic echo canceller output signal, and an estimated echo energy from an estimated echo signal; determining a cross-correlation between the acoustic echo canceller output signal and the microphone signal; determining a numerator comprising a difference between the cross-correlation and the acoustic echo canceller output energy; determining a first product by multiplying the estimated echo energy with a first coefficient; determining a second product by multiplying the microphone energy with a second coefficient; determining a denominator comprising a sum of the first product and the second product; dividing the numerator by the denominator to determine a ratio; comparing a magnitude of the ratio to a predetermined threshold; and selecting a rate of adaptation in the acoustic echo canceller, based at least in part on the comparing of the magnitude of the ratio and the predetermined threshold.