zerodf¶

class diffsptk.AllZeroDigitalFilter(filter_order, frame_period=1, ignore_gain=False)[source]¶

See this page for details.

Parameters

filter_orderint >= 0 [scalar]: Order of filter coefficients, \(M\).
frame_periodint >= 1 [scalar]: Frame period, \(P\).
ignore_gainbool [scalar]: If true, perform filtering without gain.

forward(x, h)[source]¶

Apply an all-zero digital filter.

Parameters

xTensor [shape=(B, T)]: Excitation signal.
hTensor [shape=(B, T/P, D)]: Filter coefficients.

Returns

yTensor [shape=(B, T)]: Output signal.

Examples

>>> x = diffsptk.step(4)
>>> h = diffsptk.ramp(4)
>>> zerodf = diffsptk.AllZeroDigitalFilter(0)
>>> y = zerodf(x.view(1, -1), h.view(1, -1, 1))
>>> y
tensor([[0., 1., 2., 3., 4.]])