mdst#

diffsptk.MDST#: alias of ModifiedDiscreteSineTransform

class diffsptk.ModifiedDiscreteSineTransform(frame_length, window='sine')[source]#

This module is a simple cascade of framing, windowing, and modified DST.

Parameters:

frame_lengthint >= 2: Frame length, \(L\).
window[‘sine’, ‘vorbis’, ‘kbd’, ‘rectangular’]: Window type.

forward(x)[source]#

Compute modified discrete sine transform.

Parameters:

xTensor [shape=(…, T)]: Waveform.

Returns:

outTensor [shape=(…, 2T/L, L/2)]: Spectrum.

Examples

>>> x = diffsptk.ramp(3)
>>> x
tensor([0., 1., 2., 3.])
>>> mdst = diffsptk.MDST(frame_length=4)
>>> y = mdst(x)
>>> y
tensor([[-0.2071, -0.5000],
        [ 1.5858,  0.4142],
        [ 4.6213, -1.9142]])

diffsptk.functional.mdst(x, frame_length=400, window='sine')[source]#

Compute modified discrete sine transform.

Parameters:

xTensor [shape=(…, T)]: Waveform.
frame_lengthint >= 2: Frame length, \(L\).
window[‘sine’, ‘vorbis’, ‘kbd’, ‘rectangular’]: Window type.

Returns:

outTensor [shape=(…, 2T/L, L/2)]: Spectrum.