Time to 'charge' a Butterworth IIR Filter - Raspberry Pi Forums

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i use butterworth digital low-pass filter separate gravity acceleration accelerometer readings gravity drift on temperature , time (i.e. can't sample gravity @ start , use throughout run).

sampling rate 50hz, cutoff 0.05hz (20s), 6th order.

since filter iir, filter needs 'charged' return close approximation 'correct' value.

there must way calculate how many iterations takes charge filter given % accuracy, google isn't being helpful is.

using arbitrary 20s; i'd rather less empirically.

suggestions?

tia

you might better search results using term "settling time" in search.
petero


raspberrypi



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