Abstract: Acoustic echo cancellation methods are provided, in which first and second suppression gains of first and second sub-bands of an Nth acoustic frame are generated, and the second suppression gain of the second sub-band of the Nth acoustic frame is adjusted according to the first suppression gain of the first sub-band of the Nth acoustic frame.

Abstract: An exemplary embodiment of an echo cancellation circuit is provided, for use in a voice interaction device simultaneously outputting a remote signal while receiving a local signal. The local signal may comprise an echo generated from the remote signal. A first filter learns the remote signal at a first speed to generate a first coefficient set, and filters the local signal by the first coefficient set to generate a first filter output. A second filter learns the remote signal at a second speed to generate a second coefficient set, and filters the local signal by the second coefficient set to generate a second filter output. A third filter comprises a third coefficient set, canceling the echo from the local signal to generate a third filter output as an echo cancellation result. The controller updates the third coefficient set based on the first, second and third filter outputs.

Abstract: Method and apparatus for echo cancellation are provided. In an echo cancellation device, remote and local signals are separated by frequency to generate a plurality of remote and local sub-band signals each corresponding to a sub-band. A plurality of voice activity detectors each respectively receives remote and a local sub-band signals to detect voice activity of the corresponding sub-band. A plurality of filters each learns a corresponding remote sub-band signal to filter a corresponding local sub-band signal, and generates a filter output of the corresponding sub-band. The learning of remote sub-band signal is dependent on a detection result of the corresponding voice activity detector. A synthesizer is coupled to the plurality of filters, mixing the filter outputs therefrom to generate an echo cancellation result.

Abstract: An exemplary embodiment of an echo cancellation circuit is provided, for use in a voice interaction device simultaneously outputting a remote signal while receiving a local signal. The local signal may comprise an echo generated from the remote signal. A first filter learns the remote signal at a first speed to generate a first coefficient set, and filters the local signal by the first coefficient set to generate a first filter output. A second filter learns the remote signal at a second speed to generate a second coefficient set, and filters the local signal by the second coefficient set to generate a second filter output. A third filter comprises a third coefficient set, canceling the echo from the local signal to generate a third filter output as an echo cancellation result. The controller updates the third coefficient set based on the first, second and third filter outputs.