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Update ema_filter.py

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Corrected the build error , caused due to return of None by apply()
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Shreya 2024-10-31 09:48:05 +05:30 committed by GitHub
parent 235d527b9f
commit cd66f4f532
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1 changed files with 11 additions and 7 deletions
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18
audio_filters/ema_filter.py
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@ -33,6 +33,8 @@ class EMAFilter:
self.alpha = alpha
self.ema_value = 0.0
def apply(self, audio_signal: list[float]) -> np.ndarray:
"""
Apply the EMA filter to a sequence of
@ -48,19 +50,21 @@ class EMAFilter:
Example:
>>> ema_filter = EMAFilter(0.2)
>>> np.allclose(ema_filter.apply([0.1, 0.5, 0.8, 0.6, 0.3, 0.9, 0.4]),
... [0.1, 0.18, 0.304, 0.3632, 0.35056, 0.460448, 0.4483584]
... [0.1, 0.18, 0.304, 0.3632, 0.35056, 0.460448, 0.4483584],
... rtol=1e-5, atol=1e-8)
True
"""
if not audio_signal:
return np.array([])
ema_signal: list[float] = []
for sample in audio_signal:
self.ema_value = audio_signal[0]
ema_signal.append(self.ema_value)
for sample in audio_signal[1:]:
if self.ema_value is None:
# Initialize the EMA with the first sample
self.ema_value = sample
else:
# Calculate the EMA for the current sample
self.ema_value = self.alpha * sample + (1 - self.alpha) * self.ema_value
ema_signal.append(self.ema_value)
ema_signal.append(self.ema_value)
return np.array(ema_signal)