Final delay values 'zf'

[ybourdin]

Hello,
Thank you for your work.
It would be great to be able to get the final delay values 'zf' like with scipy.signal.lfilter, so that on the next calls to sample_wise_lpc with consecutive buffers, one can pass zi = zf.
zf can be obtained like this, but it's not so obvious:

y1 = sample_wise_lpc(x[:, :L], a, zi=None)
order = a.size(-1)
zf = y1[: -order:].flip(1)
y2 = sample_wise_lpc(x[:, L:), a, zi=zf)

[yoyolicoris]

Hi @ybourdin , glad to know you're interested in our work!
Good suggestion!
I suggest having a separate function like sample_wise_lpc_zf that implements what you describe and returns a tuple (y, zf) so we don't introduce backwards incompatible changes.
Please feel free to submit a PR, and we'll review it.

[yoyolicoris]

Hi @ybourdin , the feature has been added to the main branch f50b419