FSK with arduino

Hi all,

I'm new with arduino, but i know about C language so i understand the most important in an arduino program.
I'm currently do a workplacement and my subject is signal processing.
So I have digital data, I need to modulate this data with a FSK modulation in audio base frequency, after that I transfert and demodulate and compare the data in/out.
I want to know if a need maybe two arduino UNO for the project or if I can do it with one board?
I read some information on this website about FSK, I try some example project to understand how works arduino, finaly I find and download softmodem5 library , but I don't know how to group file ( example for the softmodem.h ) that work if the file are on the same folder or I need to do something special ? And the file need to be rename in arduino file(ino)?

Thank you in advance for your help,