enricobuehlerandClaude Fable 5 1d31e4c565 feat(phase-lock): controller v2 — circular phase, coherence gate, decay-to-zero ...

Round-1 on-glass falsified two v1 assumptions in one morning (NP3 ↔ .173):

- A median lead is immovable under period-spanning jitter (uniform mod P),
  so v1 orbited the period at 2 ms/s forever — and the dead-signal freeze
  hotfix never armed, because ±1.5 ms of window sampling noise kept
  resetting its 'error responded' check. Thresholds can't referee noise.
- A HELD hold is not free: it delays sampling after the capture stamp,
  taxing e2e by up to a period (user-measured: ~+4 ms during the orbit).
  The correct failure response is DECAY TO ZERO, never freeze-in-place.

v2, all three layers:
- Wire: PhaseReport grows a length-discriminated coherence tail (27-byte
  form; the u16::MAX sentinel encodes as the byte-identical 25-byte v1 —
  strict-prefix discipline, both forms pinned by tests).
- Client: the reporter sends the CIRCULAR vector-mean latch phase mod the
  panel period + its coherence (‰); pf.present logs circ=/coh=.
- Host: steps only while coherent (floor 300‰; a v1 report bypasses the
  gate), along the signed SHORTEST way around the period, under a
  cumulative 1.25-period travel budget that is noise-immune by construction
  (it integrates applied steps, not reported errors); incoherence or budget
  exhaustion decays the hold to zero and re-arms once flat. Deadband
  convergence resets the budget — tight regimes lock exactly as designed.

report_phase + the C ABI mirror gain the coherence parameter (canary-only
ABI, hours old, sole caller in-tree). Gates: docker amd64 clippy
--all-targets -D warnings (host+core, nvenc) clean; core suite 244/244;
cargo ndk arm64 check clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-31 10:55:24 +02:00

..

punktfunk_core.h

feat(phase-lock): controller v2 — circular phase, coherence gate, decay-to-zero

2026-07-31 10:55:24 +02:00