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).
• Returns: perturbed signal (…, time).
• Return type: ret (torch.Tensor)

Examples

>>> import torch
>>> waveform = torch.randn(16000)  # Example waveform of 1 second
>>> sample_rate = 16000
>>> perturbed_waveform = speed_perturb(waveform, sample_rate, factor=0.9)
>>> perturbed_waveform.shape
torch.Size([14400])  # Duration will be shorter due to speed perturbation