Fix transition bandwidth reported in 'filter too short' error (#11406)#14005
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CedricConday wants to merge 4 commits into
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Fix transition bandwidth reported in 'filter too short' error (#11406)#14005CedricConday wants to merge 4 commits into
CedricConday wants to merge 4 commits into
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larsoner
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Jun 30, 2026
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…-tools#11406) The error reported transition * sfreq / 2.0, but transition is already half the Nyquist-normalized width, so it displayed half the actual transition band (e.g. 0.50 Hz for a requested 1.0 Hz). Report transition * sfreq. Adds a regression test.
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Fixes #11406
What was wrong
When a requested FIR
filter_lengthis too short, the raised error reports the transition bandwidth astransition * sfreq / 2.0. Buttransitionis computed as(prev_freq - this_freq) / 2.0where the frequencies are already normalized to the Nyquist rate, so it is already half the Nyquist-normalized width. Multiplying bysfreq / 2.0therefore displays half the real transition band — e.g. a requestedl_trans_bandwidth=1.0Hz is reported as0.50 Hz.this_N(the required length) is computed correctly; only the message is wrong.Fix
Report
transition * sfreq, which is the true transition bandwidth.Test
Adds
test_filter_too_short_error_reports_correct_transition: a too-short filter withl_trans_bandwidth=1.0now reports1.00 Hz transition band. Verified it reports0.50 Hzonmainand1.00 Hzwith this change.AI-assisted, human-reviewed — I'm an AI engineer; I find, fix, and test with AI (Claude Code), then review and verify before opening.