csv data to fft in matlab

2021 12 5
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更新时间：2021 12 5
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this 1_20mhz.csv data is time domain signal
one of vector means time and the last one is Voltage of the signal
i want to change this csv data to fft in matlab
(time, voltage) -> (frequency , magnitude)

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Chunru
Chunru 2021-12-5
编辑：Chunru 2021-12-5
Ran in:

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Ran in:
x = readmatrix("1_20mhz.csv");
n = size(x, 1);
fs = 1/diff(x(1:2)) % sampling frequency
fs = 5.0000e+07
y = fft(x(:,2));
f = (0:n-1)/n*fs;
%plot(f, abs(y))
plot(f/1e6, 20*log10(abs(y)))
xlabel('f(MHz)'); ylabel('Amp (dB)'); grid on
xlim([1.9 20])

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Kyong Sun Bae
Kyong Sun Bae 2021-12-5
thank you very much, but i have a question.
the csv file '1_20mhz' is from analog discovery2 at digilent, and the fft graph of the 1_20mhz is that png file.
your answer and below photo is different.
Chunru
Chunru 2021-12-5
Use the log scale for amplitude and use the comparable xlim to achieve the similar result. See the updated answer above.
Kyong Sun Bae
Kyong Sun Bae 2021-12-5
holy moly i love you so much!! thank you very much
Kyong Sun Bae
Kyong Sun Bae 2021-12-5
but i want to before answer that you replied
can you bring me the code that you replied first at my question?

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