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I’m quite new to android development, and just know started to learn how to use the sensors.
I started reading about the sensors in the the developers.android site, and came across this article.
it says there that in order to get the real acceleration you should apply a high pass filter, because the sensor reads also the gravity force.
my question is: why not just subtract the gravity force (g) from the value?
Because the actual sensed gravity depend on the angle of your device to the vertical.
A high pass will filter constants (and slow movements)
What are High-Pass and Low-Pass Filters containing links to various resources.