scipy.signal.

sos2zpk#

scipy.signal.sos2zpk(sos)[source]#

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

Parameters:

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

Returns:

zndarray: Zeros of the transfer function.
pndarray: Poles of the transfer function.
kfloat: System gain.

Notes

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

Added in version 0.16.0.

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 Support for the array API standard for more information.