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tf.signal.idct

Computes the 1D Inverse Discrete Cosine Transform (DCT) of input.

Currently Types I, II, III, IV are supported. Type III is the inverse of Type II, and vice versa.

Note that you must re-normalize by 1/(2n) to obtain an inverse if norm is not 'ortho'. That is: signal == idct(dct(signal)) * 0.5 / signal.shape[-1]. When norm='ortho', we have: signal == idct(dct(signal, norm='ortho'), norm='ortho').

input A [..., samples] float32/float64 Tensor containing the signals to take the DCT of.
type The IDCT type to perform. Must be 1, 2, 3 or 4.
n For future expansion. The length of the transform. Must be None.
axis For future expansion. The axis to compute the DCT along. Must be -1.
norm The normalization to apply. None for no normalization or 'ortho' for orthonormal normalization.
name An optional name for the operation.

A [..., samples] float32/float64 Tensor containing the IDCT of input.

ValueError If type is not 1, 2 or 3, n is not None,axisis not-1, ornormis notNoneor'ortho'`.

Scipy Compatibility

Equivalent to scipy.fftpack.idct for Type-I, Type-II, Type-III and Type-IV DCT.