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bundles / scipy latest / scipy / signal / _filter_design / cheb2ap

function

scipy.signal._filter_design:cheb2ap

source: /scipy/signal/_filter_design.py :4755

Signature

def   cheb2ap ( N ,  rs ,  * ,  xp = None ,  device = None )

Summary

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

Extended Summary

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

N : int

The order of the filter

rs : float

The attenuation in the stopband

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.

Returns

z : ndarray[complex128]

Zeros of the transfer function.

p : ndarray[complex128]

Poles of the transfer function.

k : float

Gain of the transfer function.

Notes

Array API Standard Support

cheb2ap has experimental support for Python Array API Standard compatible backends in addition to NumPy. Please consider testing these features by setting an environment variable SCIPY_ARRAY_API=1 and providing CuPy, PyTorch, JAX, or Dask arrays as array arguments. The following combinations of backend and device (or other capability) are supported.

====================  ====================  ====================
Library               CPU                   GPU
====================  ====================  ====================
NumPy                 ✅                     n/a                 
CuPy                  n/a                   ✅                   
PyTorch               ✅                     ✅                   
JAX                   ✅                     ✅                   
Dask                  ✅                     n/a                 
====================  ====================  ====================

See dev-arrayapi for more information.

See also

cheby2

Filter design function using this prototype

Aliases

  • scipy.signal.cheb2ap

Referenced by

This package