dct

diffsptk.DCT

alias of DiscreteCosineTransform

class diffsptk.DiscreteCosineTransform(dct_length, dct_type=2)

See this page for details.

Parameters:

dct_lengthint >= 1

DCT length, \(L\).

dct_typeint in [1, 4]

DCT type.

forward(x)

Apply DCT to input.

Parameters:

xTensor [shape=(…, L)]

Input.

Returns:

outTensor [shape=(…, L)]

DCT output.

Examples

>>> x = diffsptk.ramp(3)
>>> dct = diffsptk.DCT(4)
>>> y = dct(x)
>>> y
tensor([ 3.0000, -2.2304,  0.0000, -0.1585])

diffsptk.functional.dct(x, dct_type=2)

Compute DCT.

Parameters:

xTensor [shape=(…, L)]

Input signal.

dct_typeint in [1, 4]

DCT type.

Returns:

outTensor [shape=(…, L)]

DCT output.

See also

idct