Patent ID: 8811602

Claim:
A telecommunication system including a full duplex speakerphone, comprising: a main signal path, including a main microphone, configured to sense an uplink signal and an echo signal and generate a coupled signal, the echo signal including non-linear distortion generated by a speaker of the speakerphone; an echo signal path, including an echo reference microphone, configured to sense the echo signal and generate a reference signal, the reference signal including downlink information and the non-linear distortion; and an acoustic echo canceller (AEC) configured to receive the coupled signal from the main signal path, to receive the reference signal from the echo signal path, and to cancel out the non-linear distortion included in the coupled signal based on the non-linear distortion included in the reference signal, wherein, to cancel out the non-linear distortion, the AEC is configured to introduce a delay in at least part of the reference signal, the delay being proportional to a path delay associated with the echo signal path.