digital Butterworth filter calculator
order:
pass:
low pass
high pass
sampling frequency:
Hz
3dB cutoff frequency:
Hz
impulse response
512 samples
gain
unity
0
phase lag
π
-π
0-½f Hz
4.841⋅y
i
= (1⋅x
i
+ 2⋅x
i-1
+ 1⋅x
i-2
) + 1.789⋅y
i-1
+ -0.948⋅y
i-2
Notes:
Calculates a discrete low pass or high pass filter.