Dolph-Chebyshev Window Length ComputationGiven a prescribed side-lobe ripple-magnitude and main-lobe width , the required window length is given by 
For (the typical case), the denominator is close to , and we have
Thus, half the time-bandwidth product in radians is approximately
where is the parameter often used to design Kaiser windows (§3.9).
Convergence of Remez Exchange
Dolph-Chebyshev Window Main-Lobe Width