If you mix a good quality accelerometer with a low quality one you get worse quality than the high quality alone.
The main problem that accelerometer have is that they are lineal sensors while human beings or animals use logarithmic ones.
What this means in practice is that it is very easy to saturate a sensor. You have sensors of 1, 2 or 3 maximun gs(gravity vectors of acceleration) while sudden movements could be bigger than that creating "out of range" samples.
What they probably do is use different scales for both accelerometers, giving them "HDR acceleration". E.g the low quality one at 10gs and the high quality at 2-3.
Comments
If you mix a good quality accelerometer with a low quality one you get worse quality than the high quality alone.
The main problem that accelerometer have is that they are lineal sensors while human beings or animals use logarithmic ones.
What this means in practice is that it is very easy to saturate a sensor. You have sensors of 1, 2 or 3 maximun gs(gravity vectors of acceleration) while sudden movements could be bigger than that creating "out of range" samples.
What they probably do is use different scales for both accelerometers, giving them "HDR acceleration". E.g the low quality one at 10gs and the high quality at 2-3.