If you have young kids, you'll relate to the value of being able to speak in code. For a few years, I was able to use Pig Latin to speak covertly around my kids. It was handy, and surprisingly ...
Depiction of the vOICe encoding scheme. A camera mounted on glasses records video that is converted to sound by a computer and transmitted to headphones in real time. Disclaimer: AAAS and EurekAlert!