Maybe a solution could be to record the digital output from the laserdisc player with a CD-recorder... it must be a perfect 1:1 digital copy!

Then put the recorded CD into your PC disc drive and take the DTS file.

The only thing to do is to transform it to be playable by a DVD player (possibly only adding "zeros" to fill the empty space and reach the DVD datarate of 1536kbps from the LD datarate of 1411kbps)

There is no problem about the fact the CD could hold only 74 minutes, as each side of a laserdisc is about 60 minutes long... the only bad thing is that you have to record 2 or 3 CDs for each movie - and recordable audio CD aren't cheap (at least here)...

If someone is able to convert the file and interested in the project, I'll record one CD and post the file on the net (hoping my old, rarely used CD recorder still works...)