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# scipy.signal.cheb2ap

scipy.signal.cheb2ap(N, rs)

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

  The returned filter prototype has attenuation of at least `rs` decibels in the stopband.

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

  See also

  `cheby2`

    Filter design function using this prototype