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paddle.audio.functional. create_dct ( n_mfcc: int, n_mels: int, norm: Optional[Literal['ortho']] = 'ortho', dtype: str = 'float32' ) → Tensor [source]
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Create a discrete cosine transform(DCT) matrix.

Parameters

  • n_mfcc (int) – Number of mel frequency cepstral coefficients.

  • n_mels (int) – Number of mel filterbanks.

  • norm (Optional[str], optional) – Normalization type. Defaults to ‘ortho’.

  • dtype (str, optional) – The data type of the return matrix. Defaults to ‘float32’.

Returns

The DCT matrix with shape (n_mels, n_mfcc).

Return type

Tensor

Examples

>>> import paddle
>>> n_mfcc = 23
>>> n_mels = 257
>>> dct = paddle.audio.functional.create_dct(n_mfcc, n_mels)