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MATLAB - obtaining magnitude spectrums

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maddoxbey

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Obtain and compare the magnitude spectrums of Hanning, Hamming and triangular windowed 100 and 110 Hz signals using a 20-ms window for each using MATLAB.

how can i do that?

i did plot 100 hz signal and made fft and saw the peak on 100 Hz. but how can i apply windows.

please someone help me. i am in deep. :/
 

You simply multiply the time-domain signal by the window before you perform the FFT.

I haven't used matlab in a while, but I believe there is a built in Hanning function (and maybe others?). Even if not, it's pretty easy to generate those windows manually.
 

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