diff --git a/klippy/extras/trigger_analog.py b/klippy/extras/trigger_analog.py
index 41bec07f7..223f83768 100644
--- a/klippy/extras/trigger_analog.py
+++ b/klippy/extras/trigger_analog.py
@@ -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):