Adaption-based reduction of echo and noise

摘要

The systems, devices, and processes described herein may generate a signal, such as an audio signal or an electrical signal, that may include echo and/or noise. The echo may be at least partially canceled based at least in part on acoustic echo cancellation or local echo cancellation, while the noise may be at least partially reduced based at least in part on noise reduction. A residual amount of echo and/or noise may then be determined. The residual echo and/or noise may be suppressed based at least in part on adaptive filtering of the signal, which may include modifying weights of an algorithm associated with an adaptive filter.

主权项

1. A system comprising:
memory; one or more processors; one or more computer-executable instructions stored in the memory and executable by the one or more processors to:
perform spatial filtering on an audio signal generated by multiple microphones,the audio signal being associated with noise and an acoustic echo;reduce at least a portion of the acoustic echo associated with the audio signal and reduce at least a portion of the noise associated with the audio signal to generate an output signal;determine residual acoustic echo associated with the output signal, the residual acoustic echo representing acoustic echo that has not been removed from the audio signal;determine residual noise within the output signal, the residual noise representing noise that has not been removed from the audio signal; andreduce the residual acoustic echo or the residual noise associated with the output signal by:
synchronizing the audio signal and the output signal by delaying the audio signal to account for an amount of time to reduce the residual acoustic echo or the residual noise from the output signal, wherein delaying the audio signal results in a delayed audio signal;removing, by an adaptive filter, the acoustic echo and the noise to generate an adapted signal;determining an error signal based at least in part on a difference between the delayed audio signal and the adapted signal;determining, based at least in part on the error signal, one or more weight modifications to the adaptive filter; andreducing, by a second filter, at least one of the residual acoustic echo or the residual noise from the output signal based at least in part on respective values of the one or more weight modifications.