Patent ID: 11917356
Assignee: ROBERT BOSCH GMBH
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 9:
10. An apparatus for a device that is worn on a head of a user, the apparatus comprising:
an accelerometer arrangement configured to provide acceleration signals for three linearly independent directions in space; and
a signal-processing arrangement configured to:
calculate a norm of total acceleration using the acceleration signals provided by the accelerometer arrangement, and
identify a head-shaking gesture and a nodding gesture using the calculated norm of total acceleration,

wherein the signal-processing arrangement is configured to carry out identification of the head-shaking gesture as a function of a comparison between the calculated norm of total acceleration and a predetermined threshold value; and the signal-processing arrangement is configured to carry out identification of the nodding gesture as a function of identifying an oscillation of the calculated norm of total acceleration about a predetermined acceleration value.