4 ms·
Couldn't you also encode data in audio itself ? I heard of a project to do this where you send out an inaudible sound and receive it elsewhere
by offtop5 6y ago
Couldn't you also encode data in audio itself ?
I heard of a project to do this where you send out an inaudible sound and receive it elsewhere
- dboreham 6y agoAnd by modulating keyboard LED brightness, and moving the DVD drawer, DC-DC converter coil whine, and ... any "transducer" controllable by the CPU.
- nomel 6y agoThe coolest example I'm aware of with hiding low frequency content like this was with an ASIC fingerprint mechanism. The tool would modify your design in a very subtle way so that the power it burned would be very slightly modulated. You could detect this with a sensitive thermometer (over many hours I believe it was). Its main use can was to read IDs out of the chips to trace which vendors were leaking/making bootleg copies of your chips.
- woeirua 6y agoYes but you’d have to find a piece of hardware capable of producing sound outside the audible range.
- deleted 6y ago[deleted]
- thehappypm 6y agoYes, definitely! All digital signals basically do this, whether it's an "audio" medium or not. Look up BPSK -- it's the simplest way to send digital signals over an analog medium.