Determining if a head mounted display (HMD) is being worn by a user is important in determining whether to turn on or to turn off the device; to enable certain features that are available when the HMD is in use; to disable features that consume too much power when turned on during periods of non-use; etc. This disclosure describes sound pattern recognition techniques to determine the presence or absence of the user’s head inside the HMD. Per the techniques, sound patterns are generated by speakers and received by microphones within the HMD. The difference in received sound patterns between the head-present and head-absent states of the HMD is used to determine whether or not a user is wearing the HMD.
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Anonymous, "Head Mounted Displays That Detect User Presence Using Sound Pattern Recognition", Technical Disclosure Commons, (August 14, 2020)