espnet2.layers.augmentation.preemphasis

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espnet2.layers.augmentation.preemphasis(waveform, sample_rate: int, coeff: float = 0.97)

Pre-emphasize a waveform along the time dimension.

y[i] = x[i] - coeff * x[i - 1]

• Parameters:
  • waveform (torch.Tensor) – audio signal (…, time)
  • sample_rate (int) – sampling rate in Hz (not used)
  • coeff (float) – pre-emphasis coefficient. Typically between 0.0 and 1.0.
• Returns: pre-emphasized signal (…, time)
• Return type: ret (torch.Tensor)