research(R20.2): threshold-based hand-off — surfaces Pan-Tompkins production requirement#746
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…gap at 1 m surfaces Pan-Tompkins requirement Implements R20.1's catalogued refinement: when NV conf > 60% AND amplitude > 3 pT, trust NV entirely. Mixed result (5 distances): - 0.5 m: NV=72.00 ✓, smart=72.0 (+0.0 error, NV trusted) ✓ - 1.0 m: NV=144 (harmonic!), smart trusts wrong NV (+72 BPM error) - 1.5 m+: falls back to weighted (NV conf below threshold) Production lesson: the threshold-based policy is correct in spirit but incorrect with simple FFT rate estimator (picks harmonics). Production needs: 1. Harmonic rejection (Pan-Tompkins QRS or autocorrelation) 2. Cross-check vs breathing band 3. Per-frame plausibility window R20.1's 'production needs Pan-Tompkins' note is confirmed BINDING, not nice-to-have, before threshold hand-off can ship. ADR-114 implementation budget refined: +30-50 LOC for Pan-Tompkins. Five-step quantum arc: - R20 vision (tick 37) - Doc 17 bridge (tick 38) - ADR-114 spec (tick 39) - R20.1 working demo (tick 40) - R20.2 threshold refinement (this tick) Production ADR-114 cog now has all known refinements catalogued BEFORE any Rust code is written. Honest mixed result — catalogue-then-revisit pattern works: R20.1 flagged production gap; R20.2 attempted fix; fix surfaced deeper gap (harmonic rejection). Three layers of refinement.
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Fifth step in the quantum integration arc. Implements R20.1's catalogued refinement; surfaces a deeper production gap.
Result (5 distances)
Production lesson
Threshold policy correct in spirit; simple FFT rate estimator picks harmonics. Pan-Tompkins QRS detection is binding, not nice-to-have, before hand-off ships.
Five-step quantum arc
R20 (vision) → Doc 17 (bridge) → ADR-114 (spec) → R20.1 (demo) → R20.2 (refinement).
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