What is the best device or piece of equipment to put between my laserdisc player and my PC to cancel out the noise in the capture?
“Always loved Vader’s wordless self sacrifice. Another shitty, clueless, revision like Greedo and young Anakin’s ghost. What a fucking shame.” -Simon Pegg.
Is it a ground loop hum? Try connecting both devices to the same electrical socket so that they share a common ground. If that doesn't work, you can buy a ground loop isolator from RadioShack.
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Also you can attach a short wire cable to the screw fixings on each device and that may isolate ground the humming issue without spending silly amounts of money.
Also next option is parametric EQ and dial in the frequency at 60Hz and make the bandwidth of the filter narrow and reduce the level or cut down so the humming disappears at loss also with any sound effect that is centred around 60Hz would then be reduced drastically! So try grounding the issue.
Only the originals from the 70mm six-track Dolby stereo Dolby format 42 will sound better on DVD/Bluray.