This project demonstrates 2 reversible methods of encrypting audio
- reciprocal (1/x)
- frequency shifting
The reciprocal method is interesting because the reciprocal of a reciprocal is the original value. In other words you can reverse the process by doing it twice.
Frequency shifting allows you to ‘hide’ audio in the ultrasound range.
download
https://github.com/tkzic/max-projects
folder: audio-encryption
patches: voice-encryption2b.maxpat