On-Head Detection and/or Hearable-Adjustment Detection using Active Acoustic Sensing

A non-transitory computer-readable storage medium comprising instructions that, responsive to execution by a processor, cause a hearable to:

• transmit during a first time period, acoustic transmit signals that propagate within at least a portion of an ear canal of a user;
• receive, during the first time period, acoustic receive signals, the acoustic receive signals representing versions of the acoustic transmit signals with one or more characteristics modified based on the propagation within the ear canal;
• and
• determine, based on at least one of an amplitude or a phase of the acoustic receive signals, at least one of the following:
• that the hearable is worn by the user during the first time period;
• and
• while the hearable is worn by the user, that the user is repositioning the hearable at their ear during at least a portion of the first time period.

A system comprising:

• at least one transducer configured to:
• transmit, during a first time period, acoustic transmit signals that propagate within at least a portion of an ear canal of a user;
• and
• receive, during the first time period, acoustic receive signals, the acoustic receive signals representing versions of the acoustic transmit signals with one or more characteristics modified based on the propagation within the ear canal;
• and
• at least one processor coupled to the at least one transducer and configured to:
• determine, based on at least one of an amplitude or a phase of the acoustic receive signals, at least one of the following:
• that the system is worn by the user during the first time period;
• and
• while the system is worn by the user, that the user is repositioning the system at their ear during at least a portion of the first time period.