Playback Device Self-Calibration Using PCA-Based Room Response Estimation

A playback device 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 playback device is configured to:
• play back first audio via at least one audio transducer;
• measure, via an acoustic echo canceller, echo path self response from audio captured via the one or more microphones during playback of the first audio;
• map the measured echo path self response to an estimated room average response via one or more transfer functions derived from principle component analysis (PCA) of a dataset comprising a plurality of room responses measured in multiple acoustic environments;
• determine calibration settings that at least partially offset acoustic characteristics represented in the estimated room average response;
• and
• apply the determined calibration settings during playback of second audio via the at least one audio transducer.

A method comprising:

• playing back first audio via at least one audio transducer of a playback device;
• measuring, via an acoustic echo canceller, echo path self response from audio captured via one or more microphones of the playback device during playback of the first audio;
• mapping the measured echo path self response to an estimated room average response via one or more transfer functions derived from principle component analysis (PCA) of a dataset comprising a plurality of room responses measured in multiple acoustic environments;
• determining calibration settings that at least partially offset acoustic characteristics represented in the estimated room average response;
• and
• applying the determined calibration settings during playback of second audio via the at least one audio transducer of the playback device.