[SciPy-User] [signal] zpk -> s domain?

[Warren Weckesser]

On Fri, Feb 11, 2011 at 9:40 AM, Fabrice Silva <silva at lma.cnrs-mrs.fr>wrote:

> El ven., 11-02-2011 a las 09:21 -0600, Warren Weckesser escribió:
> > On Fri, Feb 11, 2011, Neal Becker <ndbecker2 at gmail.com> wrote:
> > > If I have a transfer function in zpk, is there a way to transform to
> > > poles and zeros in s domain?
>
> > I'm confused by the question, because if you have the transfer
> > function "in zpk", don't you already have the zeros, poles and gain?
>
> Is variable z unambigously related to the Laplace variable s ?
> Frequential representations of z-domain filter are computed with
> z = exp(jw/Fs).
>
>

In scipy.signal (and in Matlab), "zpk" means "zeros (z), poles (p) and gain
(k)".

Warren



> Is there the same relation z=exp(s/Fs) so that calculations of poles and
> zeros would merely be a matter of inverting this relation s=Fs log(z) ?
>
> --
> Fabrice Silva
>
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