how to solve a Plotting FFT problem
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Mohamed Ashraf am 18 Feb. 2018
Beantwortet: John BG am 18 Feb. 2018
I have this code for generating a signal and plotting it in time domain and frequency domain but the plot in the frequency domain has a problem as I suppose frequency to be 1000 but it plots around it not the 1000 and not the 500 and -500 can any body help??
%First,generating a signal and plotting it
f=input('Enter Signal Frequency=');
amp_signal=input('Enter ampliude of transmitted Signal Frequency=');
%Frequency Domain of transmitted signal
trans_signal_fft = fftshift(trans_signal_fft);
f_axis = linspace((-f),(f),length(trans_signal_fft));
title('Transmitted signal in time domain')
%Display transmitted signal in frequency domain
title('Transmitted signal in frequency domain')
John BG am 18 Feb. 2018
this is John BG <mailto:email@example.com firstname.lastname@example.org>
if the time vector does not have a small enough step the output will show a shifted frequency, or not even show any frequency at all. Try the following
just on 2 samples per cycle, and it's not clear what is the input. Don't work on the edge, try to get as many samples as reasonably possible per cycle.
Using 4 samples per cycle
and here you have the input tone.
Bear in mind that it would make sense to plot amplitude and phase, or real in imaginary, just plugging the complex fft into plot is not the way to proceed, choose what you want to plot.
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thanks in advance for time and attention
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