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sos_filter: define filtfilt call

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To implement host-side analysis of tap data,
we need a way to apply the same filtering as on the mcu.
As bonus, it cancels the induced signal delay.

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Timofey Titovets 2026-01-24 17:11:41 +01:00 • committed by KevinOConnor
parent dfe6d3f066
commit 5fb9902dda
1 changed files with 7 additions and 0 deletions
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7
klippy/extras/trigger_analog.py
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@ -38,6 +38,7 @@ class DigitalFilter:
return
try:
import scipy.signal as signal
import numpy
except:
raise cfg_error("DigitalFilter require the SciPy module")
if highpass:
@ -69,6 +70,12 @@ class DigitalFilter:
def get_initial_state(self):
return self.initial_state
def filtfilt(self, data):
import scipy.signal as signal
import numpy
data = numpy.array(data)
return signal.sosfiltfilt(self.filter_sections, data)
# Produce sample to sample difference (derivative) of a DigitalFilter
class DerivativeFilter:
def __init__(self, main_filter):