Acoustic multi-channel cancellation

摘要

A multi-channel acoustic echo canceller arrangement comprises a microphone (111) providing a microphone signal having contributions from at least two audio sources (107, 109) to be cancelled. An echo canceling circuit (113, 115) performs echo cancellation of the two audio sources (107, 109) based on channel estimates for channels from each of the audio sources (107, 109) to the microphone (111). An estimation circuit (117) generates each of the channel estimates as a combination of a previous channel estimate and a channel estimate update where the combination includes applying a relative weight to the channel estimate update relative to the previous channel estimate. A weight processor 119 varies the relative weight in response to a time value. The arrangement may provide improved echo-cancellation for scenarios wherein the rendering of sound from the audio sources (107, 109) is time varying, such as when time varying decorrelation filters are used.

主权项

1. A multi-channel acoustic echo canceller arrangement comprising:
a circuit for receiving a microphone signal from a microphone, the microphone signal comprising contributions from at least two audio sources to be cancelled; an echo canceling circuit coupled to the microphone, the echo canceling circuit being arranged to perform echo cancellation of the at least two audio sources based on channel estimates for channels from each of the at least two audio sources to the microphone; an estimation circuit for generating each of the channel estimates as a combination of a previous channel estimate and a channel estimate update, the combination comprising applying a relative weight to the channel estimate update relative to the previous channel estimate; and a weight circuit arranged to vary the relative weight in response to a time value, wherein the relative weight is determined as a function of time, and wherein the weight circuit is arranged to increase the relative weight of the channel estimate update for increasing time durations.