Chebyshev type II filter order selection.
Return the order of the lowest order digital Chebyshev Type II filter that loses no more than gpass dB in the passband and has at least gstop dB attenuation in the stopband.
wp, ws – Passband and stopband edge frequencies, normalized from 0 :
gpass – The maximum loss in the passband (dB). :
gstop – The minimum attenuation in the stopband (dB). :
analog – Non-zero to design an analog filter (in this case wp and :
ord – The lowest order for a Chebyshev type II filter that meets specs. :
Wn – The Chebyshev natural frequency for :