20 bits = 2 and a half bytes, and you are right that is enough.
What surprises me is how people regarding this as "novel" not too long ago quite a few people used a "modem". That was a mythical device that used phone networks to transmit information. Regular phones would pick up that as sound.
Sure there are few technical hurdles - covert communication and stringent error correction are most visible, but concepts are remarkably similar.
What surprises me is how people regarding this as "novel" not too long ago quite a few people used a "modem". That was a mythical device that used phone networks to transmit information. Regular phones would pick up that as sound.
Sure there are few technical hurdles - covert communication and stringent error correction are most visible, but concepts are remarkably similar.