espnet2.layers.augmentation.speed_perturb

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espnet2.layers.augmentation.speed_perturb(waveform, sample_rate: int, factor: float)

Speed perturbation which also changes the pitch.

Note: This function should be used with caution as it changes the signal duration.

• Parameters:
  • waveform (torch.Tensor) – audio signal (…, time)
  • sample_rate (int) – sampling rate in Hz
  • factor (float) – speed factor (e.g., 0.9 for 90% speed)
  • lengths (torch.Tensor) – lengths of the input signals
• Returns: perturbed signal (…, time)
• Return type: ret (torch.Tensor)