s [N1 K], we require that N1=N.
 Usage: tapers=dpsschk(tapers,N,Fs)
 Inputs:
 tapers        (tapers in the form of: 
                                   (i) precalculated tapers or,
                                   (ii) [NW K] - time-bandwidth product, number of tapers) 

 N             (number of samples)
 Fs            (sampling frequency - this is required for nomalization of
                                     tapers: we need tapers to be such
                                     that integral of the 