ndps2c

class diffsptk.NegativeDerivativeOfPhaseSpectrumToCepstrum(cep_order, fft_length)

See this page for details.

Parameters:

cep_orderint >= 0

Order of cepstrum, \(M\).

fft_lengthint >= 2

Number of FFT bins, \(L\).

References

[1]

B. Yegnanarayana, “Pole-zero decomposition of speech spectra,” Signal Processing, vol. 3, no. 1, pp. 5-17, 1981.

forward(n)

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)

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.

See also

c2ndps