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calculate DTFT of an analog signal

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oualkadi

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how to calculate DTFT of an analog signal using matlab?
 

Be clear that in MATLAB you can do only FFT which is a efficient form of DTFT.

now lets take a analog signal

x(n)= A sin (2*pi*f*t);

( in a PC nothing is analog)...

so lets make it Discrete ... and the sampling freq fs = ( 1/Ts)

lets and fs > 2*fm .. fm = max freq in our input signal

lets take Ts=0.1 for a period of 1 sec




Code: 
Ts=0.1;
T= 0:Ts:1;
f=3; %hz
x= 10.*sin(2*pi*f*T);
plot(T,x);

freq= fft(x);   %takeing   FFT for the signal

plot(fftshift(abs(freq)));



this must be a simple matlab code but i dont know if the syntax are correct

hope it helped you
 

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