What are speech-detecting accelerometers?

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    The "speech-detecting accelerometer" is an Apple invention, patent filed April 3, 2014, and granted (US9313572 B2) April 12, 2016: "System and method of detecting a user's voice activity using an accelerometer".

    The abstract says:
    "A method of detecting a user's voice activity in a mobile device is described herein. The method starts with a voice activity detector (VAD) generating a VAD output based on (i) acoustic signals received from microphones included in the mobile device and (ii) data output by an inertial sensor that is included in an earphone portion of the mobile device. The inertial sensor may detect vibration of the user's vocal chords modulated by the user's vocal tract based on vibrations in bones and tissue of the user's head. A noise suppressor may then receive the acoustic signals from the microphones and the VAD output and suppress the noise included in the acoustic signals received from the microphones based on the VAD output. The method may also include steering one or more beamformers based on the VAD output. Other embodiments are also described."

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