Some smart cameras have a face detector to determine where the faces (people) are. To detect who is talking and to zoom in to the talker, SSL (Sound Source Localization) is used with a built-in mic array on the camera. However, for some cameras, the video camera components (lens, CCD, processor) may be separate from a mic array, which may be in another component such as a sound bar or in a standalone mic array. There is a need to transmit SSL information from such a separate mic array to the camera components.
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Anonymous, "SSL (Sound Source Localization) pan angle over USB", Technical Disclosure Commons, (July 15, 2021)