Patent ID: 9354447
Filing Date: 2016-05-31
CPC Classification: A42B,A63B,A63C,G01C,G02B

Claim Text:
1. A head mounted information system comprising: a frame configured to be worn by a user; a sensor unit coupled to the frame, the sensor unit comprising a gyroscope configured to produce angular velocity signals representing a head angular velocity about a generally horizontal z-axis oriented generally perpendicular to a direction the user is facing when the user is wearing the frame; and, a processor unit coupled to the frame, the processor unit connected to receive signals from the sensor unit, wherein the processor unit is configured to receive the angular velocity signals from the sensor unit, monitor the head angular velocity to determine a first peak angular velocity and a second peak angular velocity, calculate a head angular acceleration by taking a derivative of the head angular velocity, detect a jump by the user when the head angular velocity indicates upward head tilting exceeding a first jumping angular velocity threshold, the head angular acceleration indicates upward head tilting exceeding an angular acceleration threshold and an absolute value of a sum of the first and second peak angular velocities exceeds a second jumping angular velocity threshold, and wherein the processor is further configured to generate a jump output signal indicting one or more jump parameters.