scipy.signal.

cheb2ap

scipy.signal.cheb2ap(N, rs, *, xp=None, device=None)

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.

Parameters:

Nint

The order of the filter

rsfloat

The attenuation in the stopband

xparray_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.

Returns:

z, p, k

Poles, zeros and gain for the filter prototype

See also

cheby2

Filter design function using this prototype