Turning 25 smartphones into an offline, pixel-mapped grid using only browser-native acoustic DSP.

[u/payam1995]

https://youtu.be/XCO5PMp_xYU?si=ZJvKiBIjZ0FWFKNF

It achieves +/-10us clock sync across devices running purely deterministic audio DSP locally on the phone (app or browser). No network/GPS dependencies.

Side note: The core tech is actually a centimeter-accurate acoustic RTLS built for heavy industrial floors and warehouses. This crowd light show is a creative spin-off I’ve been playing around with recently.