#### Previous topic

scipy.signal.cheb1ap

#### Next topic

scipy.signal.cmplx_sort

# 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`.

  See also

  `cheby2`
    Filter design function using this prototype