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bundles / scipy 1.18.0 / scipy / signal / _filter_design / sos2zpk

function

scipy.signal._filter_design:sos2zpk

source: /scipy/signal/_filter_design.py:1423

Signature

def sos2zpk(sos)

Summary

Return zeros, poles, and gain of a series of second-order sections.

Parameters

sos : array_like

Array of second-order filter coefficients, must have shape (n_sections, 6). See sosfilt for the SOS filter format specification.

Returns

z : ndarray

Zeros of the transfer function.

p : ndarray

Poles of the transfer function.

k : float

System gain.

Notes

The number of zeros and poles returned will be n_sections * 2 even if some of these are (effectively) zero.

Array API Standard Support

sos2zpk 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                   ⚠️ no JIT             ⛔                   
Dask                  ⚠️ computes graph     n/a                 
====================  ====================  ====================

See dev-arrayapi for more information.

Aliases

  • scipy.signal.sos2zpk

Referenced by

This package