Patent ID: 8121260
Filing Date: 2012-02-21
Classification: H04M

Abstract:
1. A method of determining if an echo canceller comprised in a communication channel that is used to transmit at least one tonal signal and characterized by a model echo path of the channel, is acceptably adapted to cancel echoes in the communication channel, the method comprising: determining a performance measure of how well the echo canceller cancels echoes of at least one test signal characterized by at least one frequency different from a frequency of the at least one tonal signal; determining if the echo canceller is acceptably adapted responsive to the performance measure; filtering the at least one test signal responsive to the model echo path to generate a test echo of the test signal; wherein determining the performance measure comprises determining how well the test echo approximates an echo of the test signal that the communication channel would generate; wherein determining the performance measure comprises receiving a copy of an echo of the at least one tonal signal generated by the echo canceller responsive to the model echo path.