Double side band with carrier wave 40 Khz -- 2

Hello , My project is based on FPGA DE2. the chip it has CYCLONE II. The input will be an audio signal going through a built-in . After the input signal been digitized , it will be modulated with a 40 Khz. The type of modulation is Double SideBand modulation. then the output is to be sent through the output port "GPIO" I have lots to say, but first , please get back at me .. My project is to be simple , it is for school and it is not complicated. I will tell you more if you contacted me .. feel free to reach me here