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FFTSampleData.m
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31 lines (25 loc) · 21.7 KB
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% Examples + help on http://au.mathworks.com/help/matlab/ref/fft.html
% Code modified from http://matlabgeeks.com/tips-tutorials/how-to-do-a-fourier-transform-in-matlab/
%Load File
Nsamps = length(sampleData);
Fs = 1/Nsamps;
t = (1/Fs)*(1:Nsamps); %Prepare time data for plot
%Do Fourier Transform
sampleData_fft = abs(fft(sampleData)); %Retain Magnitude
sampleData_fft = sampleData_fft(1:Nsamps/2); %Discard Half of Points
f = Fs*(0:Nsamps/2-1)/Nsamps; %Prepare freq data for plot
%Plot Sound File in Time Domain
figure
plot(t, sampleData)
xlabel('Time (s)')
ylabel('Amplitude')
title('sampleData in Time Domain')
%Plot Sound File in Frequency Domain
figure
plot(f, sampleData_fft)
xlabel('Frequency (Hz)')
ylabel('Amplitude')
title('Frequency Response of sampleData')
[amplitude, frequency] = max(sampleData_fft)
%TODO: print highest frequency and its magnitude