Accelerometer autocalibration in a mobile device

An apparatus configured to calibrate an accelerometer, comprising:

• means for receiving a signal from the accelerometer;
• means for detecting freefall of the accelerometer from the signal;
• means for measuring a noise level of the signal after the accelerometer remains in freefall for at least a predetermined period of time following the detecting freefall;
• and
• means for compensating the accelerometer to mitigate the measured noise level, after the accelerometer remains in freefall for at least the predetermined period of time.

An apparatus configured to calibrate an accelerometer, comprising a processor configured to:

• receive a signal from the accelerometer;
• detect freefall of the accelerometer from the signal;
• measure a noise level of the signal after the accelerometer remains in freefall for at least a predetermined period of time following the detecting freefall;
• and
• compensate the accelerometer to mitigate the measured noise level after the accelerometer remains in freefall for at least the predetermined period of time.

A non-transitory computer-readable medium, comprising instructions stored thereon that, when executed by a processor, cause the processor to execute a method comprising:

• receiving a signal from an accelerometer;
• detecting freefall of the accelerometer from the signal;
• and
• after the accelerometer remains in freefall for at least a predetermined period of time following the detecting freefall:
• measuring a noise level of the signal;
• and
• compensating the accelerometer to mitigate the noise level.