01
Wearer channel
A compliant contact pad couples laryngeal vibration into a passive piezoelectric element. Its voltage perturbs a resonant RF structure.
Engineering atlas · baseline 0.1
No battery.
Nothing hidden.
A passive throat-contact choker that gives a visible reader puck a clean “wearer” channel. The puck supplies RF energy, records the room with consent, and turns two honest signals into useful meeting memory.
Feasibility demonstrated in literatureProduct architecture derivedWearable RF design unvalidated
The one-sentence thesis
Use body vibration to label the wearer before AI, then use AI for restoration, alignment, transcription, and summarization—not to guess which room voice belongs to the wearer.
02
Room channel
A conventional microphone array lives in the reader puck, where battery, compute, indicators, thermal design, and serviceability belong.
03
Fusion
Clock-aligned streams yield “me” and “meeting.” Contact-to-air coherence helps identify the wearer without relying only on voiceprints.
04
Trust
A mechanical mute opens the sensor path and detunes or shorts the tag. The puck’s indicator is driven by actual capture state.
What is fact—and what is not
| Status | Claim | Consequence |
|---|---|---|
| Demonstrated | The Soviet Great Seal device was passive and remotely illuminated; diaphragm motion altered the returned RF signal. | The physical principle is historical fact, not science fiction. |
| Demonstrated | TagMic (2025) reports a batteryless analog microphone using a piezo sensor, varactors, dual resonators, and frequency-separated backscatter. | A modern research prototype strongly validates the core mechanism. |
| Derived | A neck-contact channel plus a room channel should simplify wearer attribution. | Build and measure the fusion advantage; do not advertise it before validation. |
| Hypothesis | A jewelry-scale, body-loaded tag can achieve useful desk-range performance with a low-cost compliant reader. | This is the central engineering risk and the purpose of P1–P3. |
| Hypothesis | Users will prefer a batteryless choker and visible puck over a rechargeable pendant. | Run comfort, trust, and workflow studies before tooling. |
The build route
- Prove the throat signal with a wire. Nothing RF can rescue a bad mechanical coupling. Measure intelligibility, placement, comfort, motion artifact, and ambient rejection first.
- Reproduce passive modulation in a shielded fixture. Characterize transfer function, resonator sensitivity, and receiver dynamic range without a person.
- Put the passive element on a body phantom. Measure detuning and loss across size, posture, moisture, fabric, and enclosure variants.
- Run supervised wearer studies at conservative power. Only after compliance review, calibrated exposure analysis, breakaway verification, and an approved protocol.
- Design a compliant low-cost puck. Replace research SDR/PA hardware, lock the regional frequency plan, and complete certification.
- Earn trust before scale. Local-first defaults, obvious capture state, export/delete, FTO review, pilot support, and measured reliability.
Complete atlas
Build without getting lost
Stage gates, bench order, required tools, first-week checklist.
System architecture
Boundaries, channels, interfaces, requirements, product states.
RF and backscatter
Physics, reference topology, antenna paths, regulatory trapdoors.
Wearable and CAD
Contact mechanics, breakaway design, fit-check models, materials.
Signal and AI
Demodulation, calibration, two-channel fusion, metrics, privacy.
Product and market
Competitive wedge, PRD, economics questions, moat, launch ladder.
Safety and compliance
Neck-wear risk, RF exposure, FCC/RED, recording consent, data.
Validation system
DVP, metrics, acceptance gates, evidence quality, test templates.
Sources and claim ledger
Primary sources, patents, product facts, freshness, uncertainties.
Marketing studio
Launch-page concept, brand platform, campaigns, SVG art, and GUI-only Blender sources.
Direct engineering files
- Wearer hardware guide
- Wearer BOM
- Reference topology SVG
- Reader hardware guide
- Reader BOM
- Mechanical README
- Parametric OpenSCAD
- Sensor pod body STL
- Sensor pod cap STL
- Pendant shell STL
- Reference DSP
- Design verification plan
- Launch compliance checklist
- Product requirements
- FTO starter map
- Marketing studio index
- Marketing launch concept
- Blender GUI workflow
- Claim ledger
Do not skip the unglamorous sentence: the published 915 MHz excitation / ~515 MHz response is a laboratory result, not a market-ready US frequency plan. Replicate it only in an appropriate shielded environment until qualified counsel and a test laboratory approve the setup.