Patent ID: 9467571
Filing Date: 2016-10-11
CPC Classification: H04M

Claim Text:
1. A method of removing echo, the method comprising: outputting an audio signal; receiving an audio signal, wherein the received audio signal includes echo resulting from said outputted audio signal; modelling an echo path of the echo in the received audio signal using a first model based on the outputted audio signal and the received audio signal to determine a first model estimate of the echo in the received audio signal; using the first model estimate to determine a first performance value according to a performance metric; comparing the first performance value with a threshold value; and determining if the echo path can be deemed linear based on said comparison and based on said comparison selectively: using the first model estimate of the echo to remove the echo in the received audio signal, or modelling the echo path of the echo in the received audio signal using a second model based on the outputted audio signal and the received audio signal to determine a second model estimate of the echo, and using the second model estimate of the echo to remove the echo in the received audio signal.