Talk:Capacitance Electronic Disc

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To-do list for Capacitance Electronic Disc: edit · history · watch · refresh · Updated 2007-03-16 Here are some tasks awaiting attention: Copyedit : Any section - all could use a little review Expand : Hardware and Software sections - Beginnings and Research also seems a bit lackluster Verify : Any unsourced statements, especially the "How CEDs Work" section Other : In general, try to make it at least to GA quality

Confusingly, "Selectavision" was first used by RCA as the name for a holographic tape system used for video recording, developed some time in the late 1960s. They later re-used the name for their CED system. —The preceding unsigned comment was added by Dex Otaku (talk • contribs) 13:57, January 15, 2005 (UTC)

The holographic tape system seemed promising as a potential replacement or competitor for telecine film, but was dropped before it really got anywhere. —The preceding unsigned comment was added by Dex Otaku (talk • contribs) 13:58, January 15, 2005 (UTC)

I removed the awkwardness diatribe from the disadvantages because it was beyond repair. First, they weigh not quite 1.5 lbs each, not 3 lbs. It is dubious whether this was a strong mark against the CED. Next, the CED sleeve is rectangular and only about 12 1/4 inches across. This short side has the spine label and is presumably the ideal side to stick out when being stored. It seems odd that their would be a height problem with storage. The only difference is that they would stick out about an 1 1/4 inches further than a record. Anyway, the statement about thickness "therefore making them too tall", makes absolutely no logical sense. As for thickness, they are effectively not much thicker than a laserdisc in a sleeve. —The preceding unsigned comment was added by 24.92.249.231 (talk • contribs) 04:28, January 30, 2005 (UTC) "odd that their would be" ---> "odd that there would be" (their/there). Thickness difference with laservideo disc in sleeve IS substantial. Consideration is not about a disc or two. When one has a collection the CED's, the plastic caddy's thickness does take up substantially more room than for an LD. For laservideo disc you must also consider how much of the apparent thickness is air. That's squishable out in storage (even if you do clear sleeves over the cardboard) -- just like LP's. A CED is not at all squishable. Moreover, packed tight, there'll be label art scuffing. Re storage, vertical in the "Hollywood Squares" furniture of scan style (Ikea; a 5x5) would not work, but those square cubicles are very deep, so the long dimension of the cubby well accommodates the CED. One wouldn't store the CED's upright anyway since no labeling would be visible on the long edge. But you'd definitely pack more LD's (and LP's) into a "Hollywood Squares" cubby than you'd pack CED's.

Just to ask, is the CED Videodisc the same as selectavision? —The preceding unsigned comment was added by Oliverdl (talk • contribs) 03:44, September 29, 2005 (UTC)

• Selectavision was RCA's brand name for video player devices. It was used on both CED Videodisc players and discs, as well as VHS machines sold by RCA. CATLIT (talk) 03:31, 9 March 2026 (UTC)[reply]

I would like to see what an actual CED disc looks like without the caddy. —The preceding unsigned comment was added by Navstar (talk • contribs) 01:09, April 17, 2006 (UTC)

If you go to the CED Magic website, maybe the guy who runs the site there can donate an image or two. -- Jimj wpg 16:24, 27 July 2006 (UTC)[reply]

I added a Image:Ced_disk.jpg and Image:Ced_cart2.jpg, I have a few more, so if you want me to upload them, just ask and I will. Athnex 20:32, 25 November 2006 (UTC)[reply]

This is a great article. I found a SelectaVision disk at a garage sale and was amazed to notice it felt like a record. It is a beautiful piece with a shiny blue background. If I can find it, I will be sure to post a picture. Iansanderson 07:21, 27 July 2006 (UTC)[reply]

According to the article, the format only lasted around five years, so I doubt too many movies were ever released in it. However, I do know that my grandmother owns a few discs, including Disney's "Alice in Wonderland" and "Mary Poppins". Is it possible to create an article (or perhaps adding to this one) a list of all Selectavision discs that were released? Xyzyxx 17:52, 14 December 2006 (UTC)[reply]

According to CED Magic, there are 1,700 known US (NTSC) titles and 272 UK (PAL) titles. - Keith D. Tyler ¶ (AMA) 18:35, 14 December 2006 (UTC)[reply]

Edits/additions(I speak as a collector of these discs) 1-the groove IS smooth, the peak and valleys are recorded/held inside the disc itself. 2-The inside metal of the disc is grounded by a spring when loaded, and forms 1 plate of a capacitor; the other plate is the needle itself. An RF frequency OSC is modulated by the capacitance variations Decoding this is VERY similar to a TV IF strip, or what an RF modulator does in reverse, with the disc being the carrier signal. 2-The grooves on a CED IS ONE spiral(like a CD);even with no tracking signals it will play OK until it hits a surface defect; it will then skip. For picture searching, little coils in the playback assembly 'kick' the needle forward and backwards;this happens automatically if a skip defect is encountered. 3-A CED has 6 fields (3 frames) per revolution;so pause on most players just lifted the needle off the disc for a blank screen. Some late players had pause with a jittery 3-frame motion 'stutter'. —Preceding unsigned comment added by 216.58.209.175 (talk • contribs)

Two things.

1. Some of your information about CEDs ("the peak and valleys are recorded/held inside the disc itself" is DIRECTLY contradicted by Memories of Videodisc.

2. This information cannot be directly used, as everything in a Wikipedia article must be cited to a reliable source. --Bill (who is cool!) 22:13, 28 March 2007 (UTC)[reply]

Image:The hobbit ced.jpg is being used on this article. I notice the image page specifies that the image is being used under fair use but there is no explanation or rationale as to why its use in this Wikipedia article constitutes fair use. In addition to the boilerplate fair use template, you must also write out on the image description page a specific explanation or rationale for why using this image in each article is consistent with fair use.

Please go to the image description page and edit it to include a fair use rationale. Using one of the templates at Wikipedia:Fair use rationale guideline is an easy way to insure that your image is in compliance with Wikipedia policy, but remember that you must complete the template. Do not simply insert a blank template on an image page.

If there is other other fair use media, consider checking that you have specified the fair use rationale on the other images used on this page. Note that any fair use images uploaded after 4 May, 2006, and lacking such an explanation will be deleted one week after they have been uploaded, as described on criteria for speedy deletion. If you have any questions please ask them at the Media copyright questions page. Thank you.BetacommandBot 06:25, 6 June 2007 (UTC)[reply]

In Germany, a system similar from users's point of view, called "Bildplatte" http://de.wikipedia.org/wiki/Bildplatte failed 10 years before the "Selectavision" failed. Did nobody at RCA tried to learn from it ? It would be nice to work out the similarities ( and differences ) both concering technology AND marketing ( trying to sell prerecorded media ). hemmerling (talk) 20:55, 24 December 2007 (UTC)[reply]