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Nearest Side Lobe: This is the difference in magnitude between the spectral lobe peak in the
spectrum and the next side lobe that occurs due to energy leakage. Different windows have
different leakage characteristics. The more narrow the resolution bandwidth of the window the
more leakage in the spectrum.
Zero Phase Reference: This is the position in the time domain gate that is the reference point for
phase in the output spectrum. That is, if a sine wave input has its peak at the zero phase reference
position, then it reads out as zero phase in the spectrum. If the phase is to be correct when doing
impulse response testing, the impulse in the time domain must be located at this position in the
gate interval.
Coefficients: These are used to generate the windows that are constructed from a cosine series.
For the Gaussian window, the value of "a" is given instead of a set of coefficients. You can find
descriptions of cosine series windows in the Handbook of Digital Signal Processing Engineering
Applications by Elliot. ISBN 0-12-237075-9.
Gaussian Window
This is the default window function (see the figure below). It is unique in that the time-domain
shape of an exponential Gaussian function transforms into a Gaussian exponential shape in the
frequency domain. This window provides optimal localization in both the time and the frequency
domain
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