WOBBLE DETECTION VIA SOFTWARE DEFINED PHASE-LOCK LOOPS

摘要

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.

主权项

1. A method for detecting a vibration using one or more phase lock loops of a software-implemented control system, the method comprising:
determining an accelerometer signal is sinusoidal when a frequency of a digital oscillator signal generated by the one or more phase lock loops substantially matches a frequency of a digitized accelerometer signal generated based on the accelerometer signal.