WOBBLE DETECTION VIA SOFTWARE DEFINED PHASE-LOCK LOOPS

The embodiments relate to the use of one or more phase lock loops (PLL's) for detecting wobble of a surface upon which a computing device is set. The PLL's can be configured to lock onto an exponentially-damped sinusoid output from an accelerometer in order to differentiate between surface...

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Bibliographic Details
Main Author ISMAIL JAMES S
Format Patent
LanguageEnglish
Published 14.05.2015
Subjects
INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES
MEASURING
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK
PHYSICS
TESTING
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Summary:The embodiments relate to the use of one or more phase lock loops (PLL's) for detecting wobble of a surface upon which a computing device is set. The PLL's can be configured to lock onto an exponentially-damped sinusoid output from an accelerometer in order to differentiate between surface-induced movement and direct human-induced movement of the computing device. Reduced latency in wobble detection can be achieved by implementing the PLL in software and using multiple PLL's per accelerometer axis. Further reduction in the latency of wobble detection can be achieved by seeding the phase of an oscillator signal generated by each PLL in order to improve phase estimates when attempting to lock a PLL onto the accelerometer output.
Bibliography:Application Number: US201414472274