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Fixes #9: Add Butterworth and Chebyshev filter APIs #13

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Merged
shrutikbalwan merged 1 commit into from
Oct 9, 2026
Merged

Fixes #9: Add Butterworth and Chebyshev filter APIs #13

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15 changes: 15 additions & 0 deletions filters.py
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Original file line number Diff line number Diff line change
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import scipy.signal as signal

def design_butterworth(order, cutoff, fs, btype='low'):
"""Designs a digital Butterworth filter."""
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = signal.butter(order, normal_cutoff, btype=btype, analog=False)
return b, a

def design_chebyshev(order, rp, cutoff, fs, btype='low'):
"""Designs a digital Chebyshev Type I filter."""
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = signal.cheby1(order, rp, normal_cutoff, btype=btype, analog=False)
return b, a
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