Our goal is to design a Digital Signal Processing (DSP) based Modulation/Demodulation Simulator in Matlab.  The simulator will utilize a graphical user interface (GUI) to download a signal, control the modulation/demodulation scheme, and the filtering  using a personal computer system for listening or analyzing radio frequency (RF) signals.  This simulation will take an intermediate frequency from a tuner/receiver and digitally process (through demodulation and IF filtering) the signal for use by an audio system or computer.