Head-related transfer functions (HRTF) describe the changes in a sound wave as it propagates from a spatial source to the eardrum of a human. With many portable user devices, such as laptop computers, tablet computers, and the like, it has become more common to use HRTF for any audio rendering performed with the devices, as doing so significantly improves the listening experience for the user. However, in such applications it is imperative that the user device knows whether the rendering is performed over headphones or over free-standing loudspeakers. Accordingly, the system and method described in this publication relates to a headphone detection algorithm that determines whether a played out audio signal is present in the microphone signals of the rendering device.
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Li, Minyue and Kleijn, Bastiaan, "SYSTEM FOR DETECTING HEADPHONES FOR HRTF RENDERING", Technical Disclosure Commons, (May 03, 2016)