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Q: I recently purchased a laserdisc player (Sony MDP-600) from a friend when my old player died. Unlike my old one, this one has an optical output. I was excited because I thought I could finally listen to the AC-3/Dolby Digital soundtracks on my old discs. My question is, how do I get it to work? I tried turning on the right analog channel, but I just hear the normal audio (mono in this case.) Is there something else I need to do? I have my receiver configured right (to the best of my knowledge). It is also a Sony (STR-DE835) and my DVDs work fine. Please help! Thanks.
A: I'm sorry to say it, but you are out of luck. Dolby Digital on laserdisc does not work the same way that it works on DVD. The Dolby Digital signal is actually contained on one of the analog audio channels in RF-modulated form. To play back this channel, you will need a laserdisc player with a dedicated RF-output. To my knowledge, no Sony laserdisc players offer this type of output. Sony ceased manufacturing LD players well before the introduction of Dolby Digital. Once you have an LD player with an RF-output, you will also need an RF-demodulator to convert this signal into a standard digital form that your receiver can process. See the following question for more information on how this works.

Sorry for the bad news. If it is any consolation to you, the optical output on your player should pass a DTS signal without any trouble.