For a project I am working on, I need to store serial data inside an audio file and read it back with the Arduino. I went the easy route and just ordered some single-chip 300 baud modem ICs. But those chips are actually obsolete and hard to find. So, I was thinking of throwing together a little project that anyone could build using LM565 ICs, some comparators and a few simple components. I am curious whether anyone would be interested in that?
I am aware that there is already this: http://trac.switch-science.com/wiki/ARMS22-SOFTMODEM-HOWTO
which uses software to do the work.
Since I am already planning to use a modem IC for my purposes and the above library exists, I don't know if it is worth the effort to put something together. With the library above, it will take up code space in your Arduino, so perhaps an external method would be useful?