Clipping based on cepstral distance for acoustic echo canceller

摘要

Echo cancellation is provided in a telephone device by calculating a metric value indicative of a similarity between a representation of an incoming signal from a far end talker and a representation of an outgoing signal from a near end talker. A threshold value is derived based on the metric value. A portion of the outgoing signal is removed by using the threshold value to determine an amount to remove from the outgoing signal with continuous, real-time updating of the threshold value.

主权项

1. A method for cancelling echo in a transceiver, the method comprising:
receiving an incoming signal by the transceiver; producing a local signal by the transceiver, wherein the local signal includes a portion of the incoming signal; forming an output signal responsive to the local signal; calculating a metric indicative of a similarity between a representation of the incoming signal and a representation of the outgoing signal; deriving a scaling factor based on the metric and removing a portion of the outgoing signal by center clipping the outgoing signal using a clipping threshold scaled by the scaling factor, wherein the threshold is based on an error signal.