Tone and echo cancellation using two acoustic sound cancellers

At least one non-transitory computer-readable medium comprising program instructions that are executable by at least one processor such that a playback device is configured to:

• monitor, via one or more microphones, for events, wherein detection of an event triggers output of an audible response from a set of audible responses;
• activate a first iterative sound canceller when the playback device is actively playing audio other than one of the audible responses from the set of audible responses, wherein the first iterative sound canceller is otherwise inactive;
• detect, via the one or more microphones, a particular event in first audio data captured via the one or more microphones, wherein detection of the particular event triggers output of a particular audible response from the set of audible responses, and wherein a second iterative sound canceller is inactive when the particular event is detected;
• before output of the particular audible response, activate the second iterative sound canceller if the first iterative sound canceller is inactive, wherein the second iterative sound canceller is configured to converge more quickly than the first iterative sound canceller;
• output, via one or more speakers, the particular audible response;
• during output of the particular audible response, capture, via the one or more microphones, second audio data;
• and
• cancel acoustic echo of the particular audible response from the captured second audio data via (i) the first iterative sound canceller when the first iterative sound canceller is activated or (ii) the second iterative sound canceller when the second iterative sound canceller is activated.

A system comprising:

• one or more microphones;
• at least one processor;
• and
• at least one non-transitory computer-readable medium comprising program instructions that are executable by the at least one processor such that the system is configured to:
• monitor, via the one or more microphones, for events, wherein detection of an event triggers output of an audible response from a set of audible responses;
• activate a first iterative sound canceller when a playback device is actively playing audio other than one of the audible responses from the set of audible responses, wherein the first iterative sound canceller is otherwise inactive;
• detect, via the one or more microphones, a particular event in first audio data captured via the one or more microphones, wherein detection of the particular event triggers output of a particular audible response from the set of audible responses, and wherein a second iterative sound canceller is inactive when the particular event is detected;
• before output of the particular audible response, activate the second iterative sound canceller if the first iterative sound canceller is inactive, wherein the second iterative sound canceller is configured to converge more quickly than the first iterative sound canceller;
• output, via one or more speakers, the particular audible response;
• during output of the particular audible response, capture, via the one or more microphones, second audio data;
• and
• cancel acoustic echo of the particular audible response from the captured second audio data via (i) the first iterative sound canceller when the first iterative sound canceller is activated or (ii) the second iterative sound canceller when the second iterative sound canceller is activated.