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Window
Functions and Its role in Spectrum Analysis
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The cutoff
of the signal produces leakage. The FFT produces fence effect. These errors
can't be removed. But we can minimize them by useing window function. Below
is some commonly used window function:
The window function that has a narrow main band have a good frequency
resolution and a bad amplitude resolution. The window function that has
a wide main band have a bad frequency resolution and a good amplitude resolution.
The applet produces two test signals:
..
..x1(t)=4*sin(2?*202.5*t)
..
..x2(t)=4*sin(2?*502.5*t)+4*sin(2?*514*t)
..
Select different window functions
to cut off signals and to see their difference in the spectrum.
Java Learning Program
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Window Function and Its
Role
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