Film-Tech Forum ARCHIVE: Dolby Digital Decoding on JSD-80D

This is topic Dolby Digital Decoding on JSD-80D in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Alexander Alves (Member # 1746) on 07-28-2007, 01:20 AM:

Can the JSD-80D decode Dolby digital from standard DVD players which have a single Digital co-ax out on a single phono RCA connector? I understand the JSD-80D has two SPDIF RCA connectors for decoding digital content. Is the digital out on DVD players the same as SPDIF? Can someone guide me with the connections? I've written to Clint Koch as well at USL and am awaiting a reply.

Posted by Stephen Furley (Member # 1277) on 07-28-2007, 02:04 AM:

I don't know the JSD 80D, but I can answer the first part of your question.

The digital Co-ax output on DVD players is SP/DIF, so if the JSD 80D does have SP/DIF inputs then you would be able to play DVDs through it. Whether the JSD 80D can decode Dolby Digital from such a source, I don't know. If it can then you will get the full 5.1 channel sound from the DVD (assuming that the disc you're playing has a 5.1 channel track of course)

If the JSD 80D can't decode Dolby Digital from a SP/DIF source then you would have to configure the DVD player to decode Dolby Digital to PCM, and feed this into the JSD 80D. However, PCM output from DVD players is only two channels, which can be matrix decoded to give L,C,R and S, as with analogue Dolby Stereo tracks on 35mm film. As an alternative, some DVD players can decode Dolby Digital to six analogue output channels; if the JSD 80D has six channel analogue inputs, then you could do it this way.

Posted by Steve Guttag (Member # 268) on 07-28-2007, 02:08 PM:

YES! The JSD-80D (with the option module) can indeed decode consumer AC-3 from DVDs. So hook up your DVD player via a single coax and whola.

Note, USL also makes a standalone single rack space decoder for cinemas too to adapt other processors for playing back Alternative content, like DVDs.

Enjoy,

Steve

Posted by Clint Koch (Member # 1179) on 07-28-2007, 03:49 PM:

Thank you Steve for answering the question.
Alexander, when did you write to me? I have not gotten any e-mails from you. Please try again.