function []=fft_simple(signal)

% function []=fft_simple(signal)

x = signal; pt = length(signal);

n = 0:600;

figure subplot(2,1,1) plot(x(1:pt)); title(‘Input Signal’) xlabel(‘sample number’)

subplot(2,1,2) X = fft(x, pt); Pxx = X. conj(X) / pt; f = 100(0:(pt-1))/pt; plot(f,Pxx); title(‘Frequency content of x (Input signal)’) xlabel(‘frequency (Hz)’)

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