Patent ID: 8634569
Filing Date: 2014-01-21
Classification: H04M

Abstract:
1. In a two-way communications system, a method of cancelling an echo of a far-end signal comprising: approximating the echo by applying a transfer function to the far-end signal to generate an approximate echo, said transfer function having an impulse response and an order; subtracting the approximate echo from a received signal comprising a near-end signal and the echo to produce an output signal; generating an adaptation coefficient; adapting the transfer function by modifying the impulse response based on the adaptation coefficient; said adaptation coefficient is generated by dividing a value generated by an estimator function by a sum of a total energy of the far-end signal over a first observation window and a predetermined constant number; said estimator function generates a value on the basis of the received signal, the output signal, the far-end signal and/or the approximate echo.