ndps2c#

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

See this page for details.

Parameters:

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

forward(n)[source]#

Convert NPDS to cepstrum.

Parameters:

nTensor [shape=(…, L/2+1)]: NDPS.

Returns:

outTensor [shape=(…, M+1)]: Cepstrum.

Examples

>>> n = diffsptk.ramp(4)
>>> ndps2c = diffsptk.NegativeDerivativeOfPhaseSpectrumToCepstrum(4, 8)
>>> c = ndps2c(n)
>>> c
tensor([ 0.0000, -1.7071,  0.0000, -0.0976,  0.0000])

diffsptk.functional.ndps2c(n, cep_order)[source]#

Convert NPDS to cepstrum.

Parameters:

nTensor [shape=(…, L/2+1)]: NDPS, where \(L\) is the number of FFT bins.
cep_orderint >= 0: Order of cepstrum, \(M\).

Returns:

outTensor [shape=(…, M+1)]: Cepstrum.