Method and apparatus for on ear detect

A method for on ear detection for a headphone, the method comprising:

• receiving a first microphone signal derived from a first microphone of the headphone and determining, from the first microphone signal, a first resonance frequency associated with the acoustic port of the first microphone, the first resonance frequency dependent on a first temperature at the first microphone;
• detecting a change in the first resonance frequency over time;
• and
• determining an indication of whether the headphone is on ear based on the change in resonance frequency and the resonance frequency after the change.

An apparatus for on ear detection for a headphone, the apparatus comprising:

• a first input for receiving a first microphone signal derived from a first microphone of the headphone;
• a second input for receiving a second microphone signal derived from a second microphone of the headphone;
• one or more processors configured to:
• determine, from the first microphone signal, a first resonance frequency associated with an acoustic port of the first microphone, the first resonance frequency dependent on a first temperature at the first microphone;
• determine, from the second microphone signal, a second resonance frequency associated with an acoustic port of the second microphone, the second resonance frequency dependent on a second temperature at the second microphone;
• and
• determine an indication of whether the headphone is on ear based on the first and second resonance frequencies.

An apparatus for on ear detection for a headphone, the apparatus comprising:

• an input for receiving a first microphone signal derived from a first microphone of the headphone;
• one or more processors configured to:
• determine, from the first microphone signal, a first resonance frequency associated with the acoustic port of the first microphone, the first resonance frequency dependent on a first temperature at the first microphone;
• detect a change in the first resonance frequency over time;
• and
• determine an indication of whether the headphone is on ear based on the change in resonance frequency and the resonance frequency after the change.