imdst

diffsptk.IMDST

alias of InverseModifiedDiscreteSineTransform

class diffsptk.InverseModifiedDiscreteSineTransform(frame_length, window='sine')

This is the opposite module to ModifiedDiscreteSineTransform().

Parameters:

frame_lengthint >= 2

Frame length, \(L\).

window[‘sine’, ‘vorbis’, ‘kbd’, ‘rectangular’]

Window type.

forward(y, out_length=None)

Compute inverse modified discrete sine transform.

Parameters:

yTensor [shape=(…, 2T/L, L/2)]

Spectrum.

out_lengthint or None

Length of output waveform.

Returns:

outTensor [shape=(…, T)]

Reconstructed waveform.

Examples

>>> x = diffsptk.ramp(3)
>>> x
tensor([0., 1., 2., 3.])
>>> mdst_params = {"frame_length": 4}
>>> mdst = diffsptk.MDST(**mdst_params)
>>> imdst = diffsptk.IMDST(**mdst_params)
>>> y = imdst(mdst(x))
>>> y
tensor([-8.9407e-08, 1.0000e+00, 2.0000e+00, 3.0000e+00])

diffsptk.functional.imdst(y, out_length=None, frame_length=400, window='sine')

Compute inverse modified discrete sine transform.

Parameters:

yTensor [shape=(…, 2T/L, L/2)]

Spectrum.

out_lengthint or None

Length of output waveform.

frame_lengthint >= 2

Frame length, \(L\).

window[‘sine’, ‘vorbis’, ‘kbd’, ‘rectangular’]

Window type.

See also

unframe window mdst