  Discrete and continuous standard windowing are revisited and a a new taper is
introduced, which is derived from the normal circular distribution by von
Mises. Both the continuous-time and the discrete-time windows are considered,
and their spectra obtained. A brief comparison with further classical window
families is performed in terms of their properties in the spectral domain.
These windows can be used in spectral analysis, and in particular, in the
design of FIR (finite impulse response) filters as an alternative to the Kaiser
window
