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torchaudio.functional.deemphasis

torchaudio.functional.deemphasis(waveform, coeff: float = 0.97) Tensor[source]

De-emphasizes a waveform along its last dimension. Inverse of preemphasis(). Concretely, for each signal \(x\) in waveform, computes output \(y\) as

\[y[i] = x[i] + \text{coeff} \cdot y[i - 1] \]
This feature supports the following devices: CPU, CUDA This API supports the following properties: Autograd, TorchScript
Parameters:
  • waveform (torch.Tensor) – Waveform, with shape (…, N).

  • coeff (float, optional) – De-emphasis coefficient. Typically between 0.0 and 1.0. (Default: 0.97)

Returns:

De-emphasized waveform, with shape (…, N).

Return type:

torch.Tensor

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