Data over Sound
File transfer between two devices using nothing but a speaker and a microphone.
Idle
Not listening
—
—
- Last heard
- —
- Signal
- —
- Throughput
- —
- Remaining
- —
- Packets
- —
- Mic level
- —
Send
Pick a file, put the devices close together, and turn the volume up. This plays a loud modem-like tone for several minutes.
No file selected.
Receive
Start listening before the sender begins — though joining late is fine, the transmission repeats until the whole file is through.
Idle.
Warnings
Diagnostics
A fuzzy constellation blob means low signal-to-noise; smeared arcs mean a timing problem. The spectrum should show a solid block across the modem's band while a burst is playing.