Head-related transfer function determination using cartilage conduction

An audio system comprising:

• a cartilage conduction transducer coupled to a pinna of a user of the audio system;
• a microphone positioned at an entrance to an ear canal of the user;
• and
• a controller configured to:
• instruct the cartilage conduction transducer to present a test sound;
• receive an audio signal that was detected by the microphone responsive to the test sound;
• determine geometric information describing the pinna of the user using a model, the test sound, and the audio signal, wherein the model maps combinations of audio signals and test sounds to corresponding geometric information that describes the pinna of the user;
• generate audio content using the geometric information;
• and
• instruct the cartilage conduction transducer to present the audio content to the user.

A non-transitory computer-readable storage medium storing instructions that, when executed by one or more processors, cause the one or more processors to perform steps comprising:

• instructing a cartilage conduction transducer to present a test sound, the cartilage conduction transducer coupled to a pinna of a user of an audio system;
• receiving an audio signal that was detected by a microphone responsive to the test sound, the microphone positioned at an entrance to an ear canal of the user;
• determining a head related transfer function (HRTF) for the user using a model, the test sound, and the audio signal, wherein the model maps combinations of audio signals and test sounds to corresponding head related transfer functions (HRTFs);
• generating audio content using the HRTF;
• and
• instructing the cartilage conduction transducer to present the audio content.