fix(signal): refuse filter designs whose coefficients overflow

Assisted-by: GLM 5.3 Flash
2026-09-28 21:36:09 +02:00
parent e9f268a461
commit 045ef28d24
5 changed files with 91 additions and 1 deletions
@@ -1054,7 +1054,9 @@ Each design returns the direct-form coefficients `b` (numerator) and `a`
 band edges prewarped to the bilinear axis and the answer exact at the mapped
 frequencies. All of them refuse an order below 1, a non-positive or infinite `fs`,
 and an edge outside `(0, fs/2)`; the band forms additionally require
-`0 < edge1 < edge2 < fs/2`.
+`0 < edge1 < edge2 < fs/2`. An order whose coefficient arithmetic
+overflows the float64 range is refused as well, never returned as a
+numerator of zeros or NaN.

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