scipy.signal.cheb2ap

scipy.signal.cheb2ap(N, rs)

Return (z,p,k) for Nth order Chebyshev type I analog lowpass filter.

The returned filter prototype has rs decibels of ripple in the stopband.

The filter’s angular (e.g. rad/s) cutoff frequency is normalized to 1, defined as the point at which the gain first reaches -rs.