zplane z or z-1

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Juan Chehin
Juan Chehin 2021-8-5
Hello, does anyone know if this graph of zplane corresponds to the z or z-1 plane?
Fs = 4400;
Fn = Fs/2;
n = 3; Rp = 0.5;
Wn = [250 2000]/Fn;
[b a]=cheby1(n,Rp,Wn,'bandpass')
[h,w]=zplane(b,a)

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Chunru
Chunru 2021-8-6
It's z-plane. See the following example, where all poles are inside the unit circle.
[b,a] = cheby2(8/2,20,[1 5]/8);
zplane(b,a)

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