Por favor el pzmap código

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Mario Gustavo
Mario Gustavo 2025-9-27，13:57
回答： William Rose 2025-9-28，0:39
-que símbolos y nomencaltura usa
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John D'Errico
John D'Errico 2025-9-27，15:26
编辑：John D'Errico 2025-9-27，15:29
Rough translation: Please, the pzmap code. What symbols and nomenclature does it use?
All I can say is, what about the help docs for pzmap was unclear?
https://www.mathworks.com/help/ident/ref/lti.pzmap.html

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回答（1 个）

William Rose
William Rose 2025-9-28，0:39
Ran in:
@Mario Gustavo,
(Traducido con Google.)
Aquí se muestra un ejemplo del uso de pzmap para un sistema de tiempo continuo: un filtro antialiasing con 8 polos y 8 ceros.
Here is an example of the use of pzmap for a continuous time system: an anti-aliasing filter with 8 poles and 8 zeros.
% Design 8th order anti-aliasiong filter (continuous time).
n=8; % number of poles
fco=1.00; % cutoff frequency (Hz)
Wp=2*pi*fco; % cutoff frequency (rad/s)
Rp=1; % passband ripple (dB)
Rs=80; % stopband attenuation (dB)
[z,p,k] = ellip(n,Rp,Rs,Wp,'s');
% Convert the zeros, poles, and gain (k) to a system
sys=zpk(z,p,k);
% Plot the poles and zeros.
figure
pzmap(sys)
title('Pole-Zero Map: 8th Order Lowpass Filter, Continuous-Time')
Este ejemplo muestra el uso de pzmap con un sistema de tiempo discreto: un filtro de muesca para eliminar el ruido de 50 Hz de una señal. Este filtro tiene una atenuación de al menos 40 dB entre 48 Hz y 52 Hz. También agregué un gráfico que muestra el círculo de estabilidad para un sistema discreto.
This example shows the use of pzmap with a discrete-time system: a notch filter to remove 50 Hz noise from a signal. This filter has at least 40 dB attenuation from 48 Hz to 52 Hz. I also added a plot showing the circle of stability for a discrete system.
% Design 4+4 order 50 Hz notch filter, discrete time
n=4; % number of poles (bandstop filter will have 2n poles)
fs=1000; % sampling frequency (Hz)
fco=[48,52]; % stop band frequencies (Hz)
Wp=fco/(fs/2); % stop band frequencies (normalized)
Rp=1; % passband ripple (dB)
Rs=40; % stopband attenuation (dB)
[z,p,k] = ellip(n,Rp,Rs,Wp,'stop');
% Convert the zeros, poles, and gain (k) to a system
sys=zpk(z,p,k);
% Plot the poles and zeros.
figure
pzmap(sys)
hold on
% Plot stability boundary
plot(cos(2*pi*(0:100)/100),sin(2*pi*(0:100)/100),'-r')
xlim([-1.2,1.2]); ylim([-1.2,1.2]);
title('Pole-Zero Map: 4+4 Order Notch Filter, Discrete-Time')
legend('Zeros and Poles','Stability Boundary')

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