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Remove unnecessary note

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mbsantiago 2025-07-29 00:03:20 +01:00
parent 2dd2c0156b
commit 829c07fb12
1 changed files with 1 additions and 9 deletions
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10
src/batdetect2/preprocess/spectrogram.py
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@ -537,21 +537,13 @@ def apply_pcen(
------- -------
xr.DataArray xr.DataArray
PCEN-scaled spectrogram. PCEN-scaled spectrogram.
Notes
-----
- The input spectrogram magnitude `spec` is multiplied by `2**31` before
being passed to `audio.pcen`. This suggests the underlying implementation
might expect values in a range typical of 16-bit or 32-bit signed integers,
even though the input here might be float. This scaling factor should be
verified against the specific `soundevent.audio.pcen` implementation
details.
""" """
samplerate = 1 / spec.time.attrs["step"] samplerate = 1 / spec.time.attrs["step"]
hop_size = spec.attrs["hop_size"] hop_size = spec.attrs["hop_size"]
hop_length = int(hop_size * samplerate) hop_length = int(hop_size * samplerate)
t_frames = time_constant * samplerate / (float(hop_length) * 10) t_frames = time_constant * samplerate / (float(hop_length) * 10)
smoothing_constant = (np.sqrt(1 + 4 * t_frames**2) - 1) / (2 * t_frames**2) smoothing_constant = (np.sqrt(1 + 4 * t_frames**2) - 1) / (2 * t_frames**2)
return audio.pcen( return audio.pcen(
spec * (2**31), spec * (2**31),