You need an Analog/Digital converter (the opposite of the Digital to Analog converter you have now).
I have seen one product from Benchmark that does this
http://www.audioadvisor.com/prodinfo.asp?number=BEADC1USB
but cannot vouch for the sonic quality. It has a USB output that allows connection to the PC and a number of other digital outputs. Apparently this unit can produce digital at 24/192.
I'm not sure what software you might need in the PC, or how you delinate one song from the next.
I have seen one product from Benchmark that does this
http://www.audioadvisor.com/prodinfo.asp?number=BEADC1USB
but cannot vouch for the sonic quality. It has a USB output that allows connection to the PC and a number of other digital outputs. Apparently this unit can produce digital at 24/192.
I'm not sure what software you might need in the PC, or how you delinate one song from the next.