Overlapping with Flat-top window
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I am using the following MATLAB code to determine the fft using a flat-top window of the whole data:
time = 0:0.1:50000;
data = 1.8*sin(2*pi*0.2003*time);
Fs = 10;
N = length(data);
w = flattopwin(N);
wdata = data(:).*w;
ws = sum(w);
Y = fft(wdata)/ws;
freq = 0:Fs/N:Fs/2-Fs/N;
freq = freq';
amplitude = 2*abs(Y(1:floor(N/2)));
plot(freq,amplitude);
Now, I wish to overlap windows prior to performing fft. Can someone please tell me how to modify the above code to perform overlapping and fft? Thanks in advance.
回答（1 个）
Star Strider
2014-9-19
I would use the spectrogram function for what you want to do. You can specify the window you want. You can get data from it if you ask it:
[S,F,T] = spectrogram(data, flattopwin(N), ...)
and if you want to plot it, use:
surf(T,F,abs(S));
axis tight;
view(0,90);
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2014-9-19
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