Spider DSA User’s Manual
122
Figure 77: Access to Test Configuration
Window Function
In signal processing, a window function (also known as an anodization function
or tapering function) is a mathematical function that is zero-valued outside of
some chosen interval. For instance, a function that is constant inside the interval
and zero elsewhere is called a rectangular window, which describes the shape of
its graphical representation. When another function or waveform/data-sequence
is multiplied by a window function, the product is also zero-valued outside the
interval: all that is left is the part where they overlap, the "view through the
window".
EDM has the following types of window function available.
Hanning window is used to select a subset of a series of samples in order to
perform a Fourier transform or other calculations. The advantage of the Hann
window is very low aliasing, and the tradeoff is slightly decreased resolution
(widening of the main lobe). If the Hann window is used to sample a signal in
order to convert to frequency domain, it is complex to reconvert to the time
domain without adding distortions.
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