Convert Data to sound and back

Question

Are there libraries out there that can convert data (text files, etc) to sound and back to the original data?

The sound can be transmitted any medium I wish, whether rad

Answer 1

To give what I think is a better response to all of the above, have a look at packet radio and the various bits that correspond to it AX.25 is a good example and there are a number of implementations for it. POCSAG is also another good implementation. Both have libraries available for many different languages and have been around for quite a long time.

Other example include things like WEFAX (weather fax), HFFax, SSTV (slow scan tv), etc.

You can think of them all as being similar to the old school phone line modem type encoders and decoders that run around the 300-2400baud