Wearable audio device with head state detection

Abstract

A wearable audio device with head state detection, includes an acoustic driver positioned to provide an acoustic signal to a user when the wearable audio device is worn and a drive signal is provided to the acoustic driver; a system microphone outputting a system microphone signal, wherein the system microphone signal is representative of the acoustic signal; and a control circuit, configured to: generate an anti-noise signal based on a feedback signal wherein the feedback signal comprises the system microphone signal and an injected content signal; generate an estimate of the feedback signal in the off-head state; and determine a state of the wearable audio device by comparing the feedback signal to the estimate of the feedback signal, wherein the state of the wearable audio device represents whether the wearable audio device is on-head or off-head.

Dependencies are inferred from the claim text.