mpir2c#

class diffsptk.MinimumPhaseImpulseResponseToCepstrum(cep_order, ir_length, n_fft=512)[source]#

See this page for details. The conversion uses FFT instead of recursive formula.

Parameters:

cep_orderint >= 0 [scalar]: Order of cepstrum, \(M\).
ir_lengthint >= 1 [scalar]: Length of impulse response, \(N\).
n_fftint >> \(N\) [scalar]: Number of FFT bins. Accurate conversion requires the large value.

forward(h)[source]#

Convert minimum phase impulse response to cepstrum.

Parameters:

hTensor [shape=(…, N)]: Truncated minimum phase impulse response.

Returns:

cTensor [shape=(…, M+1)]: Cepstral coefficients.

Examples

>>> h = diffsptk.ramp(4, 0, -1)
>>> mpir2c = diffsptk.MinimumPhaseImpulseResponseToCepstrum(3, 5)
>>> c = mpir2c(h)
>>> c
tensor([1.3863, 0.7500, 0.2188, 0.0156])