c2mpir

class diffsptk.CepstrumToMinimumPhaseImpulseResponse(cep_order: int, ir_length: int, n_fft: int = 512)

See this page for details.

Parameters:

cep_orderint >= 0

The order of the cepstrum, \(M\).

ir_lengthint >= 1

The length of the impulse response, \(N\).

n_fftint >> N

The number of FFT bins used for conversion. The accurate conversion requires the large value.

forward(c: Tensor) → Tensor

Convert cepstrum to minimum-phase impulse response.

Parameters:

cTensor [shape=(…, M+1)]

The cepstral coefficients.

Returns:

outTensor [shape=(…, N)]

The truncated minimum-phase impulse response.

Examples

>>> import diffsptk
>>> c2mpir = diffsptk.CepstrumToMinimumPhaseImpulseResponse(4, 5)
>>> c = torch.tensor([0.5, -0.3, 0.2, -0.1, 0.05])
>>> h = c2mpir(c)
>>> h
tensor([ 1.6487, -0.4946,  0.4039, -0.2712,  0.1803])

diffsptk.functional.c2mpir(c: Tensor, ir_length: int, n_fft: int = 512) → Tensor

Convert cepstrum to minimum phase impulse response.

Parameters:

cTensor [shape=(…, M+1)]

The cepstral coefficients.

ir_lengthint >= 1

The length of the impulse response, \(N\).

n_fftint >> N

The number of FFT bins used for conversion.

Returns:

outTensor [shape=(…, N)]

The truncated minimum phase impulse response.

See also

mpir2c mgc2mgc