MATLAB: Amplitude Modulation a .Mp3 file

Question

Hi, I'm trying to amplitude modulate a .mp3 file which is already saved in the system. Now when I'm trying to multiply it with a high frequency carrier wave I'm getting an error regarding the frames. The audio signal is in a matrix of [1024*1] but the carrier is in a matrix of [1*1] Also I need to convert it into digital form and transmit it using Arduino

I'm using MATLAB 2013 and designing it on Simulink.

Any suggestions?

Answer 1

wavread() already converts the file to digital form.

There is no problem multiplying a 1024 x 1 vector by a 1 x 1 scalar.