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.]
"From 1862 until the mid-1870s Sacramento raised the level of its downtown by building reinforced brick walls on its downtown streets, and filling the resulting street walls with dirt. Thus the previous first floors of buildings became the basements... Most property owners used screw jacks to raise their buildings to the new grade." -- https://en.wikipedia.org/wiki/Sacramento%2C_California#Capital_city
Modems are still finding use for sending and receiving faxes, and those seem to have a few more years of life in them. They're also still useful as out-of-band management for routers... Why cellular modems with RS-232 aren't more popular and widely available, I don't know.
Hmm... Testing Karma.