Sound level control in responding to the estimated impedances indicating that the medium being an auditory canal and other than the auditory canal

Abstract

A system and method for controlling a sound level of a mobile audio device are disclosed herein. In accordance with at least some embodiments, a system includes a transducer, a phase estimator, and a sound level control. The transducer converts an electrical signal applied to the transducer into audible sound. The phase estimator estimates a phase difference between a voltage and a current of the electrical signal applied to the transducer. The sound level control controls the loudness of sound produced by the transducer based, at least in part on the estimated phase difference.