nightstalkerpoet said:

Ok, my last piece on the laserdisc piece. in relation to software fm signal conversion, would this be helpful? im not a programmer or anything, but this guy seemed to be on the right path, if im understanding correctly.

arachnoid.com/phase_locked_loop

Someone is already working on this: https://github.com/happycube/ld-decode

Unfortunately, the FM signal isn't "what's on the LD", so-to-speak. It's generated by the player, so you can think of the code above as a means to capture from an LD without using a comb filter and without all of the processing done by a capture card and its drivers.