`scipy.signal._filter_design:ellipap`

Signature

def ellipap(N, rp, rs, *, xp = None, device = None)

Return (z,p,k) of Nth-order elliptic analog lowpass filter.

The filter is a normalized prototype that has rp decibels of ripple in the passband and a stopband rs decibels down.

The filter's angular (e.g., rad/s) cutoff frequency is normalized to 1, defined as the point at which the gain first drops below -rp.

N : int: The order of the filter
rp : float: The passband ripple intensity
rs : float: The stopband attenuation
xp : array_namespace, optional: Optional array namespace. Should be compatible with the array API standard, or supported by array-api-compat. Default: numpy
device : any: optional device specification for output. Should match one of the supported device specification in xp.