Here's a demo which shows a way to produce WAV sound files with TEXT
(Actually, from ANY SHAPE YOU WANT)
This way you can hide some secret messages into small wav files and send them. The receiver must know how to open the sound file and read WAVEFORM data to understand secret message.
Your image must be in the ratio of 300x150 pixels and a BITMAP file.
Black parts in BITMAP represents silence, and WHITE parts are noiseses.
"Which programs did you use?"
- Check the video!