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Added safety checks for filter stability

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This commit is contained in:
Anan 2025-02-06 05:13:11 +05:30
parent e59d819d09
commit 358a6473b5
1 changed files with 21 additions and 0 deletions
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21
audio_filters/butterworth_filter.py
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@ -9,7 +9,22 @@ Code based on https://webaudio.github.io/Audio-EQ-Cookbook/audio-eq-cookbook.htm
Alternatively you can use scipy.signal.butter, which should yield the same results. Alternatively you can use scipy.signal.butter, which should yield the same results.
""" """
# All calls to filter creators must have keyword arguments
def safe_checks(filter_creator):
def safe_filter_creator(**kwargs):
if not isinstance(kwargs['frequency'], int) or kwargs['frequency'] <= 0:
raise ValueError('Frequency must be a positive integer.')
if not isinstance(kwargs['samplerate'], int) or kwargs['samplerate'] <= 0:
raise ValueError('Samplerate must be a positive integer.')
if not (0 < kwargs['frequency'] < kwargs['samplerate'] / 2):
raise ValueError('Frequency must be less than half of the samplerate.')
if kwargs['q_factor'] <= 0:
raise ValueError('Q factor must be positive.')
return filter_creator(**kwargs)
return safe_filter_creator
@safe_checks
def make_lowpass( def make_lowpass(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -40,6 +55,7 @@ def make_lowpass(
return filt return filt
@safe_checks
def make_highpass( def make_highpass(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -70,6 +86,7 @@ def make_highpass(
return filt return filt
@safe_checks
def make_bandpass( def make_bandpass(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -101,6 +118,7 @@ def make_bandpass(
return filt return filt
@safe_checks
def make_allpass( def make_allpass(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -128,6 +146,7 @@ def make_allpass(
return filt return filt
@safe_checks
def make_peak( def make_peak(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -160,6 +179,7 @@ def make_peak(
return filt return filt
@safe_checks
def make_lowshelf( def make_lowshelf(
frequency: int, frequency: int,
samplerate: int, samplerate: int,
@ -197,6 +217,7 @@ def make_lowshelf(
return filt return filt
@safe_checks
def make_highshelf( def make_highshelf(
frequency: int, frequency: int,
samplerate: int, samplerate: int,