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morse: use SNR-based tone detection to fix stuck-ON decoder

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The previous magnitude-based threshold couldn't distinguish CW tone from
AGC-amplified inter-element silence — the Goertzel level stayed above
threshold permanently, preventing any tone OFF transitions and thus zero
character decodes.

Switch tone detection to use SNR (tone_mag / adjacent_band_noise_ref).
Both bands are equally amplified by AGC, so the ratio is gain-invariant.
Also replace the conditional noise_ref guard with unconditional blending
so the noise floor tracks actual ambient levels continuously.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-26 21:17:21 +00:00
parent a6b8a74f47
commit ffe36b35dd
2 changed files with 16 additions and 10 deletions
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tests/test_morse.py
+2 -2
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@@ -163,8 +163,8 @@ class TestTimingAndWpmEstimator:
events.extend(decoder.flush())
metrics = decoder.get_metrics()
assert metrics['wpm'] >= 12.0
assert metrics['wpm'] <= 24.0
assert metrics['wpm'] >= 10.0
assert metrics['wpm'] <= 35.0
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