Remember when the web used to be fun?
In the spirit of that age I made a little website that does a lot of fancy maths and thinking stuff to tell you if you're alive or not.
Enjoy!
New blog post: Transmitting data via ultrasound without any special equipment
Did you know your speakers can play (and your microphone can record) audio at frequencies beyond what most people can hear? They can! And you can use that fact to secretly transmit data!
edit: oops, that had something weird going on with the youtube embed. fixed.
https://halcy.de/blog/2025/06/27/transmitting-data-via-ultrasound-without-any-special-equipment/
Steve:
frequent overthinker, compulsive fixer, digester-then-explainer, "why?" question relishing father, minor-irritant partner, excessive disassembler, original-form hacker, high-efficiency googler, borderline-competent car-fixer, expert-level car-breaker, faster-by-qwerty communicator, indiscriminate photo-taker, Leatherman owner.