nice to know that yu are working on such a project. A friend of mine did a project on this topic. He designed a ful pc based oscilloscope. U can find all the project report and the code on the site http://website.lineone.net/~colin_mccord/FYP/index.htm
I am a student of Optical Engineering at the GIKI (GHULAM ISHAQ KHAN INSTITUTE OF ENGINEERING SCIENCES AND TECHNOLOGY). My final year project is based on the Optical Private Branch Exchange. Now the most important thing for me on the first stage is to get hold of the Pulse code Modulation as this will be used for the modulation of the signal. If any body can help me on this topic or else on the whole of mine project it will be very help ful for me..