Quadrature Amplitude Modulation

1st Version:
Two impulses of different frequencies are first declared, two different carriers are used to modulate the signal to different frequencies.
Then both residuals are added and transmitted, i showed them using a subplot.
This transmitted signal is then demodulated by the same program on the same carriers and hence receiving the initial signals successfully.
all the plots are shown as a result.

2nd Version:
this included the use of filter at the demodulation step

3rd Version:
this update version includes wavread to read two voice signals to modulate and then after demodulation actual voice signals are saved using wavwrite.

you can change the files and can put any files of your choice, all u need to do is to change their titles and u need to check out their frames and put them accordingly in the main program.

The file is fully changed. It is the application of QAM to combine two voice band signals to different frequencies, this combined signal is now carrying two signals with it both at different frequencies as set in program, the actual signals are received back by demodulation using same carrier frequencies. both the signals i tested are copied in the folder.
you can change the files and can put any files of your choice, all u need to do is to change their titles and u need to check out their frames and put them accordingly in the main program.