Patrick, the barometer sensor samplerate is ~50 Hz and I did the butterworth filter with regular Pd objects, not as external (see attached).
In the Pd patch I modeled sensor noise (resolution 3 Pascal according to datasheet) and pressure gradient, simulating vertical speed through the air. The aim is to get 0.1 m/s accuracy in vertical speed reading. Theoretically, this would be almost possible with the butterworth. But our real sensor has much more noise than 3 Pascal resolution. Therefore I'm still interested in better filters.
Katja
On Wed, Dec 12, 2012 at 6:29 PM, patrick puredata@11h11.com wrote:
hi Katja,
did you ported this filter: https://github.com/lebipbip/le-BipBip/blob/master/filter.c
to an pd external? if yes could you share it? not sure if it would help my situation (noisy accelerometer 1 axis), but i would like to give it a shot.
thx
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