Quietnet: a simple chat program using inaudible sounds
Imagine being able to chat with another user using what's in effect a modem program that transmits sounds at near ultrasonic frequencies. Now imagine your cat or dog being royally pissed off by your conversation.The future is now. An anonymous Pipedotter wrote it to direct out attention to quietnet, a program that does just that. It is a simple chat program that works without Wifi or Bluetooth connections and won't show up in a pcap. You need a good pair of speakers to make it work: If you can clearly hear the send script working then your speakers may not be high quality enough to produce sounds in the near ultrasonic range.
Quietnet is dependant on pyaudio[1] and Numpy[2].
[1] http://people.csail.mit.edu/hubert/pyaudio/
[2] http://www.numpy.org/
The same Anonymous Coward notes: "Quietnet is just a toy! Take a look at minimodem[3] or gnuradio[4] if you need something robust."
[3] http://www.whence.com/minimodem/
[4] http://gnuradio.org/
[Ed. note: looks pretty interesting. Time to test out my cat's audio frequency sensitivity, that fuzzy bastard.]
I spent the better part of Feb-March playing around with an old Pentium 4 I wanted to turn into a dial-up machine. I got way into the details of serial connections, modems, Getty, ttys, PPP, and the like, and never even really got it working before I finally gave up and admitted defeat. I used a program called minicom for a long while to chat with the modem, and was impressed by just how hard the days of modems and SLIP/PPP connections really were, how much magic really went into negotiating a PPP chat session. Seems like minimodem would be fun to play with too, if only for the change.