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select a random sub-region of the noise based on the delta duration #1317

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merged 3 commits into from
Apr 17, 2024
Merged

select a random sub-region of the noise based on the delta duration #1317

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6218b5b
select a random sub-region of the noise based on the delta duration
osadj Apr 5, 2024
734c56a
fix failing unit tests in cut mix
osadj Apr 6, 2024
63e7476
apply tolerance in while loop condition unconditionally
osadj Apr 9, 2024
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10 changes: 8 additions & 2 deletions lhotse/cut/set.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3562,9 +3562,15 @@ def noise_gen():
# Keep sampling until we mixed in a "duration" amount of noise.
# Note: we subtract 0.05s (50ms) from the target duration to avoid edge cases
# where we mix in some noise cut that effectively has 0 frames of features.
while mixed_in_duration < target_mixed_duration:
while mixed_in_duration < (
target_mixed_duration - 0.05
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if self.duration is None
else target_mixed_duration
):
to_mix = next(mix_in_cuts)
to_mix = self._maybe_truncate_cut(to_mix, target_mixed_duration - mixed_in_duration, rng)
to_mix = self._maybe_truncate_cut(
to_mix, target_mixed_duration - mixed_in_duration, rng
)
# Keep the SNR constant for each cut from "self".
mixed = mixed.mix(
other=to_mix,
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