How do I add a Hanning Window to this code before I FFT it?

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Paul Clarkson
Paul Clarkson 2017-10-19
回答： Shivam Bahuguna 2020-8-19
Hi,
I've heard adding a Hanning Window can help with data processing before you apply a Fourier Transform. With the code I have below, where can I add such a window?
Any help would be greatly appreciated.
a=dlmread('Ethanol_05273.txt');
alex_x=a(873:2048,1)/1000;
alex_y=a(873:2048,2);
plot(alex_x,alex_y); grid on;
alex_x_f=10000./alex_x;
F=linspace(min(alex_x_f),max(alex_x_f),1024);
alex_y_f=interp1(10000./alex_x,alex_y,F,'pchip');
FT=fft(alex_y_f);
figure;
plot(abs(FT));

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采纳的回答

dpb
dpb 2017-10-19
编辑：dpb 2017-10-19
FT=fft(hanning(length(alex_y_f)).*alex_y_f);
presuming your data are vectors. If not, use the proper array dimension for length() of window, of course.
See
doc hanning % details on windowing

更多回答（2 个）

Paul Clarkson
Paul Clarkson 2017-10-20
Thank you!
Shivam Bahuguna
Shivam Bahuguna 2020-8-19
How to take care of the window ccorrection factor while doing this?

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