Chebyshev type I filter order selection.
Return the order of the lowest order digital Chebyshev Type I 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 I filter that meets specs. :
Wn – The Chebyshev natural frequency (the “3dB frequency”) for :