par2lpc#

class diffsptk.ParcorCoefficientsToLinearPredictiveCoefficients(lpc_order: int, gamma: float = 1, c: int | None = None)[source]#

See this page for details.

Parameters:

lpc_orderint >= 0: The order of the LPC, \(M\).
gammafloat in [-1, 1]: The gamma parameter, \(\gamma\).
cint >= 1 or None: The number of filter stages.

forward(k: Tensor) → Tensor[source]#

Convert PARCOR to LPC.

Parameters:

kTensor [shape=(…, M+1)]: The PARCOR coefficients.

Returns:

outTensor [shape=(…, M+1)]: The LPC coefficients.

Examples

>>> x = diffsptk.nrand(4)
>>> x
tensor([ 0.7829, -0.2028,  1.6912,  0.1454,  0.4861])
>>> lpc = diffsptk.LPC(3, 5)
>>> a = lpc(x)
>>> a
tensor([ 1.6036,  0.0573, -0.5615, -0.0638])
>>> lpc2par = diffsptk.LinearPredictiveCoefficientsToParcorCoefficients(3)
>>> par2lpc = diffsptk.ParcorCoefficientsToLinearPredictiveCoefficients(3)
>>> a2 = par2lpc(lpc2par(a))
>>> a2
tensor([ 1.6036,  0.0573, -0.5615, -0.0638])

diffsptk.functional.par2lpc(k: Tensor, gamma: float = 1, c: int | None = None) → Tensor[source]#

Convert PARCOR to LPC.

Parameters:

kTensor [shape=(…, M+1)]: The PARCOR coefficients.
gammafloat in [-1, 1]: The gamma parameter, \(\gamma\).
cint >= 1 or None: The number of filter stages.

Returns:

outTensor [shape=(…, M+1)]: The LPC coefficients.