This software was developed for Analog Devices DSP ADSP-2106x family of DSP. This code will modulate and demodulate AM, FM, USB and LSB. Two different modules are included. One for Tx and the other for Rx. The code is provided as-is. This means you must figure out how to compile and link it. However, it is free of charge. Have fun!
Download Transmit Module
Download Receive Module