A near-future acoustic system for dense shared spaces: two people stay in the crowd, keep situational awareness, and still enter a perceptual privacy bubble.
Form
4 emitters · 1 sensor node · 1 edge core
Claim
Perceptual privacy bubble, not absolute silence.
Audience
Investor / media launch with a real open-source ending.
The bubble is not sold as silence. It is sold as a controlled conversational envelope: clearer for the pair, less intelligible for the crowd.
Problem definition
The real ask is not silence. The real ask is selective privacy in the middle of a crowd.
A believable product for this space has to do two things at once: preserve the pair's conversation quality and degrade outside intelligibility without pretending the room stops existing.
Perceptual privacy bubble
Speech inside becomes easier to understand; speech outside becomes weaker and harder to parse.
No claim of perfect silence, zero leakage, or universal isolation in any room.
Four layers turn a sci-fi desire into a constrained engineering system.
The stack combines directional acoustics, field shaping, AI-assisted selective listening, and tracking-aware fail-safe control. Each layer is assigned a different confidence level on purpose.
Layer 01 · Directional ultrasonic emitters
prototype
Four ceiling or desktop nodes launch steerable ultrasonic carriers that aim toward a shared conversation volume.
The system does not claim a magical invisible wall. It claims controlled sound delivery: narrow aim, lower spill, and a stable geometric envelope around the two speakers.
Microphone arrays capture the mixed scene, then focus the speech model on the two enrolled voices instead of every nearby talker.
This is the answer to the real problem. In a crowd, acoustics alone cannot perfectly erase interference, so selective listening has to become part of the stack.
Head and mouth tracking update the control geometry in real time and rapidly reduce output when the system loses confidence.
Perfect privacy is not promised. A safe, measurable degradation path is. When lock quality drops, the bubble shrinks, the level falls, and the UI surfaces uncertainty.
A product site should show the geometry, not only talk about it.
On capable desktop browsers, the 3D scene renders the core idea: a crowd stays active, two users stay highlighted, and the system aims its useful overlap instead of painting the whole room with sound.
WebGL
Desktop prefers the 3D bubble stage when WebGL is available.
Fallback
Mobile and non-WebGL environments fall back to a static, readable geometry card.
Feasibility ladder
Separate what can be prototyped now from what still belongs to productization and research.
The site is careful about maturity. Every statement sits on one of three tracks: prototype now, mid-term productization, or far-term research.
Prototype now
Desktop or ceiling-mounted ultrasonic nodes with constrained seating geometry
Target-speaker extraction for two enrolled users
Tracking-aware power reduction and explicit confidence UI
Mid-term productization
Better room calibration and lower leakage through array optimization
More resilient re-lock behavior in motion and reverberation
Industrial acoustic safety measurement and certification workflow
Far-term research
Moving from constrained seating to freer crowd navigation
Multi-bubble orchestration in one room without unstable interference
Shrinking the hardware footprint toward furniture-scale or wearable adjuncts
Scenario value
The product matters only if the bubble changes real behavior in real shared spaces.
The first release story is intentionally concrete: open office, train lounge, command cell, and creator desk. Four scenes, one operating principle.
Open office
10 voices · 3 m²
Small project huddles happen inside the team floor instead of escaping to meeting rooms.
Design target: speech becomes clearer inside the bubble while outside listeners lose sentence intelligibility first.
Train lounge
Mobile cabin
Pairs can review plans, negotiate, or take sensitive calls without sealing themselves off with headphones.
Design target: faster re-lock after body sway and seat vibration.
Command cell
Dense control room
Critical operators can exchange short tactical speech while the room keeps its shared awareness.
Design target: transparent uncertainty handling and power-reduction fail-safe.
Creator desk
Studio / desktop
A solo creator can enter a review bubble with an editor while the studio remains socially open.
Design target: usable on desktop stands before a full ceiling deployment exists.
Open route
The ending is not “trust us.” The ending is a stack the world can inspect, fork, and pressure-test.
Open-source is part of the credibility story: publish the website, the notes, the control logic, the prototype hardware fixtures, and the known gaps.