How can I plot the amplitude and phase responses of a Cascaded Integrated Comb filter?

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soso maths
soso maths 2019-5-18
编辑： soso maths 2019-5-18
I'm trying to plot the amplitude and phase responses of a Cascaded Integrated Comb filter
But I don't get the right Sinc function in the amplitude response, any idea? Here is the transfer function in discrete domain.
Capture.JPG
and Here is my code
clear all
close all
clc
omg = -10:0.01:10;
N = 3;
M = 1;
R = 2;
n = [-1 zeros(M*R-1,1) 1];
d= [-1 1];
num = [1];
den = [1];
for i = 1:N
num = conv(num,n);
den = conv(den,d);
end
H = freqs(num,den,omg);
figure(1)
plot(omg,abs(H))
figure(2)
plot(omg,angle(H))

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