aqua-feel sync: --shape ramp for slow-swell visuals (measures, never gives a verdict) #34
2026-11-11
aqua-feel sync ramp: measure and print, never give a verdict
A second Soul pass falsified the late claim: one outlier raw frame before the true start moves the upper bound earlier (wrong at true lags 4-97 ms on heavy-tailed noise, 3% outlier frames, keyframe-style spikes), and a bed that swells near a hit takes over the pairing. After the first pass removed the early and inside claims, nothing is left that a ramp can soundly assert about sync, so every ramp pair is borderline and never fails the gate. The estimate and interval are printed for a person to read. Tests: the outlier frame and the swelling bed, both with a true lag the old verdict got wrong. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
aqua-feel sync ramp: bound the start only from raw frames, never claim early or inside
A Soul pass falsified the first ramp detector: the +-60 ms centred average crossed before the picture did (fast rises called detectably late inside the window), the smoothing ran over samples (stretched on variable-frame-rate tracks), and the lower bound was a heuristic presented as a bound (slow-start shapes called early or inside while in sync). Now: time-based smoothing, hiS from the raw frames, and a ramp can be audio-late-detectable or borderline only. Adds the Soul's fast-rise, VFR and a 120-case sweep over shapes, rises, decays, rates, noise and offsets as tests. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
aqua-feel sync: --shape ramp, a detector for slow-swell visual responses
Perlines v2's Vector trails answers a sound with a brightening over hundreds of ms; the step detector found no visual onset in any of its takes. The ramp detector takes the rise over 300 ms as novelty, finds each rise's quiet level and 20%/80% crossings, and reports the foot of that line with the interval it can defend: from before the quiet minimum (backed off by the valley-to-20% time, which a property test over three ramp shapes and decaying tails showed necessary) to the 20% crossing. Tests: synthetic ramps at known offsets (linear, exponential, smoothstep; 30 and 60 fps), noise and drift give nothing, and a 0.2 MB real Perlines capture (step finds 0, ramp pairs 3 of 5). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>