Systems and methods for nonlinear echo cancellation

摘要

In accordance with embodiments of the present disclosure, an audio processing circuit for use in an audio device may perform non-linear acoustic echo cancellation by predicting a displacement associated with an audio speaker, wherein such prediction takes into account a nonlinear response of the audio speaker with a mathematical model that calculates the predicted displacement of the audio speaker as a function of a current signal associated with the audio speaker using a time-varying difference equation, wherein coefficients of the difference equation are based on a set of physical parameters of the audio speaker. From the predicted displacement, the processing circuit may calculate a predicted acoustic output of the audio speaker, which may be used to generate a reference signal to an acoustic echo canceller.

主权项

1. An apparatus for non-linear acoustic echo cancellation, comprising:
a current signal input configured to receive a current signal indicative of an electrical current associated with an audio speaker; a processing circuit configured to:
calculate a predicted displacement associated with the audio speaker including a nonlinear response of the audio speaker with a mathematical model which calculates predicted displacement of the audio speaker as a function of the current signal using a time-varying difference equation, wherein coefficients of the difference equation are based on a set of physical parameters of the audio speaker;calculate a predicted acoustic output of the audio speaker based on the predicted displacement; andgenerate a reference signal to an acoustic echo canceller, wherein the reference signal is equivalent to the predicted acoustic output of the audio speaker.