c2ndps#

class diffsptk.CepstrumToNegativeDerivativeOfPhaseSpectrum(cep_order, fft_length)[source]#

See this page for details.

Parameters:

cep_orderint >= 0 [scalar]: Order of cepstrum, \(M\).
fft_lengthint >= 2 [scalar]: Number of FFT bins, \(L\).

forward(c)[source]#

Convert cepstrum to NDPS.

Parameters:

cTensor [shape=(…, M+1)]: Cepstrum.

Returns:

nTensor [shape=(…, L/2+1)]: NDPS.

Examples

>>> c = diffsptk.ramp(4)
>>> c2ndps = diffsptk.CepstrumToNegativeDerivativeOfPhaseSpectrum(4, 8)
>>> n = c2ndps(c)
>>> n
tensor([ 30.0000, -21.6569,  12.0000, -10.3431,  10.0000])