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The Parzen window is a piece-wise cubic approximation of the Gaussian
Window of extend two. It is the only window, that is discussed in this
paper, that is fixed to a certain width.
However, its frequency response is not really promising for it is
worse than that of the Bartlett windowed cosc function (generally,
when compared to all other frequency responses, it approximates the
ideal one most poorly above
and is not really good below).