poles : ndarray
Array of LP roots (poles).
fix_roots : {‘incr’, ‘decr’}
Type of roots which to consider bad and to stabilize. Either those
with increasing signals ‘incr’ or decreasing signals ‘decr’.
fix_mode : {‘on’, ‘reflect’}
Method used to stabilize bad roots, ‘on’ to move the roots onto the
unit circle, ‘reflect’ to reflect bad roots across the unit circle.
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