FILE 02 / WORKING HYPOTHESIS REGISTER
Numbers to test, not performance to advertise.
These values are provisional Norysr design hypotheses. Their literature basis is being re-audited, and none has been measured on Norysr hardware.
Revision 02. Not a prescription, safety envelope or regulatory determination.
00 / CURRENT STATUS
The evidence column is suspended until source verification is complete.
A release review found citation-identity mismatches in the earlier research paper. The public register therefore keeps only the questions and provisional values needed to plan benchtop experiments. It does not claim that the values are established by literature.
Working hypothesis
A proposed value selected for prototype planning. It can change before hardware exists.
Derived budget
Arithmetic assembled from working allocations. It is not a measured timing trace.
Needs specialist review
A safety, clinical or regulatory assumption that the project team is not qualified to determine alone.
Evidence audit pending
No external-source claim is treated as validated until its identifier and supporting text have been checked.
01 / SENSING HYPOTHESES
Start with one shank unit and two muscle channels.
| Item | Provisional value | Status |
|---|---|---|
| IMU placement | Anteromedial distal shank | Working hypothesis |
| IMU acquisition | 6-axis at 100 Hz; compare 200 Hz | Working hypothesis |
| sEMG channels | 2 channels: tibialis anterior and gastrocnemius medialis | Working hypothesis; placement requires clinician review |
| sEMG acquisition | 1 kHz, 16-bit; filtering to be established during bench work | Working hypothesis |
| Feature window | Evaluate 150–250 ms windows | Working hypothesis |
02 / STIMULATION QUESTIONS
No public value is a safe-use instruction.
Frequency, pulse width, current, electrode placement, command duration and stimulation timing must be defined through electrical-safety work and licensed-clinician review. They are intentionally omitted from this page while the evidence base is re-audited.
Default state
Stimulation off after startup, reset, communication loss, watchdog expiry or sensor fault.
Independent limits
Hardware-level limits should not depend on the application processor or machine-learning output.
Human control
A licensed clinician must define and review any future stimulation envelope before participant-facing work.
03 / INFERENCE HYPOTHESES
The first benchmark is comparative, not clinical.
| Question | Provisional criterion | Status |
|---|---|---|
| Can a compact model classify gait phase? | Compare against an IMU-only rule baseline | Experiment to design |
| Does sEMG improve timing or robustness? | Report participant-level false and missed triggers | Experiment to design |
| Can inference stay local? | Profile a quantized model on candidate microcontrollers | No hardware selected |
| Can calibration help? | Compare population and per-user models | No Norysr dataset |
04 / LATENCY LEDGER
The 23 ms command subtotal remains arithmetic.
| Stage | Provisional allocation | Status |
|---|---|---|
| Sensor read | ≤5 ms | Working allocation |
| Window update and buffering | ≤10 ms | Working allocation |
| Inference | ≤5 ms | Working allocation |
| Command transfer | ≤3 ms | Working allocation |
| Sensor to stimulation command | ≤23 ms | Unmeasured derived subtotal |
No timing value has been measured on Norysr hardware.
05 / VALIDATION ORDER
Bench evidence comes before participant claims.
- Verify sensor synchronization, isolation and default-off behavior.
- Measure sensor-to-command latency distributions on candidate hardware.
- Compare model output with a transparent rule baseline on an appropriate dataset.
- Obtain clinical, ethics, electrical-safety and regulatory review before participant-facing work.