4 ms·
Yup, a company I co-founded http://chirp.io http://chirp.io has been using this technique (well, MFSK) to share data over the air, between mobile and embedded d
by goodmachine 10y ago
Yup, a company I co-founded http://chirp.io http://chirp.io has been using this technique (well, MFSK) to share data over the air, between mobile and embedded devices for a while now.
Easy to describe, hard to do robustly.
- JorgeGT 10y agoI'm curious, did you selected audible frequencies (1760hz-10.5khz) because there were the only ones technically feasible with the current popular mics/speakers or because you actually wanted users to hear the data? I have played with minimodem to do this (FSK) and while cool, it is an unpleasant noise. I managed to transmit at inaudible frequencies but certainly it was very very unreliable with normal consumer hardware.
- goodmachine 10y agoBoth, in fact. Add to this we wanted the system to work reliably at very low volumes in noisy surrounds, and it was a very interesting challenge. If you'd like to know more, we have trial SDKs you can goof around with. Feel free to give the technology a spin.
- Jayakumark 10y agoOne more startup in this area is http://www.getpangea.com/ http://www.getpangea.com/
- wyldfire 10y agoCan it survive a vocoder?