CED VideoDisc and Player Discussion

[matt carr]

Has anyone ever tried to mod their CED player to have an S-Video connection?

[RT9342]

I tried it once, and I didn't have much success. I still think it may be possible, but it requires more work than I was willing to put in at the time that I tried it.

If I remember correctly, the luminance and chromanance mixing occurs inside of an IC. I remember finding a chromanance signal on the board, but I think it was the 1.53MHz carrier from the disc, not the upconverted 3.58MHz carrier. Also, the luminance signal was way too low. But I'm sure that an amplifier could be used to increase the luminance signal, and even if a pure 3.58 MHz chromanance signal cannot be obtained directly, I would imagine that a differential amplifier could be used to subtract the luminance signal from the composite signal, leaving just the chromanance signal. The only problem with that, though, is that I think the signals are mixed prior to dropout compensation. But I could be wrong. I'll take a look at my service documents to verify all of that. It's been so many years now that I can't remember all of the details.

[matt carr]

[RT9342]

CEDatum.net sells the training manuals, which are mainly block diagrams and explanations, but I believe they can still sell copies of the schematic diagrams as well. That's where I got mine from.

[Rixrex]

I looked into doing this as well, with my Dad who was in the electronics division with RCA in Indiana when they made CEDs, before he retired. We were interested in doing this also for Beta VCRs. Our efforts didn't pan out too successfully and it turned out that it really wasn't worth the effort, and there are conversion devices available on the market that did a better job just using the video output, even if it is in effect layered processing.

[ae.tc]

Here's the ebay pseudo-solution


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