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What does this PR do ?

Adds three new randomized augmentations: soft and hard clipping, lossy codec copression (Opus/MP3/Vorbis/GSM), and lowpass filters. Can be used in any training run that uses Lhotse dataloaders/samplers.

Depends on latest Lhotse features lhotse-speech/lhotse#1512 lhotse-speech/lhotse#1510
as well as on a PR that is currently in review lhotse-speech/lhotse#1511

Collection: common

Changelog

  • Add clipping/saturation augmentation
  • Add lowpass augmentation (via resampling back-and-forth)
  • Add lossy codec augmentation (Opus/MP3/Vorbis/GSM)

Usage

  • You can potentially add a usage example below
# Add a code snippet demonstrating how to use this 

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Additional Information

assert len(batch) == 4
cut = batch[0]
assert isinstance(cut, MixedCut)
for track in cut.tracks:

Check notice

Code scanning / CodeQL

Unused local variable Note test

Variable audio is not used.
@anteju
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anteju commented Sep 26, 2025

@racoiaws, please update documentation as well.

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2 participants