FT of a sinc pulse with side lobe of 3 and 0

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Hoda 2014-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/156084-ft-of-a-sinc-pulse-with-side-lobe-of-3-and-0

编辑： Matt J 2014-9-25

HI. Im trying to do the Fourier transform(real and imaginary) of a sinc pulse with central peak of 8 points and side lobe of 3 and 0, respectively. I sort of got the 8 point peak but I dont know how to get the 3 and 0 side lobes.

close all
freq = 0:1:127;
t =-49:0.1:49;
y = sin(pi*t/4)./(t);
FT = (fft(y,256));
r = real(FT);
im = imag(FT);
% plotting the time domain 
figure(12); plot(t,y),axis([-50 50 -0.2 0.9])