Sawtooth fit
Model a clock as a straight drift that is pulled back at correction events, and fit the rate from whole teeth (the correction divided by the time since the previous one).
Studies
| Study |
Date |
Status |
Summary |
| How often each device is corrected |
2026-10-17 |
current |
The devices re-synchronise in different ways: SNUADC when its drift reaches about half a second, BIS on a fixed 8,192 s timer, and the Primus by small steps about every two hours that do not keep up with its drift (+104 ppm, measured later by breath matching). |
| The stamp sawtooth model for SNUADC and BIS |
2026-10-12 |
current |
Fitting each track's record stamps against its sample count as a drift with corrections (a sawtooth) puts SNUADC and BIS on one timeline without any artefact. Checked against shared bursts, the EEG–ECG timing error falls from about 790 ms on the recorded stamps to 33 ms with one constant per SNUADC mode in the pilot, and 42 ms over the whole release. |