Talk:Vertical blanking interval

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Someone could probably reword that bit about buffer transfer in computer graphics systems during VBI so that it would be a bit more understandable to an outsider. --Russvdw 7/12/06

[edit] VBI really available for DVI?!

I have looked for facts regarding how VBI is related to DVI as stated in this article. I haven't found anything on the net and suspect that VBI is superseeded by the DVI and HDMI digital standards through HDCP. Anyone that know this for fact or can refer to a source please correct the article to either point to a source that DVI has VBI or remove the reference to it, it confuses things. --Starbar 12:38, 28 September 2006 (UTC)

Yes the blanking interval is still there. As stated in the article, it allows programmers and hardware designers to do offline processing during that time. It's a ton easier to ping-pong different buffers than to try to handle "true" streaming data. HDCP has nothing to do with it - some of the article states what can happen in the VBLANK time. Page 32 of the TMDS data sheet, which is the protocol for a DVI connection, shows the timing of active video vs blanking. — RevRagnarok ^{Talk Contrib} 14:04, 28 September 2006 (UTC)

Yes yes you are correct and I understand that there is a VBI intervall, I was looking for VBI data such as Closed Caption (CC), Wide Screen Signaling (WSS) and CGMS-A copy protection as well as the European Teletext data transmition over VBI. But you are right of course there is a VBI well defined even for DVI/HDMI but still, is it used to transfer these data packets on the hidden video lines? I guess not, and maybe that would be worth mentioning from a technical standpoint. The enduser never see the difference sinse it is burnt in by the receiver STB. --Starbar 14:17, 3 October 2006 (UTC)

[edit] Wording of first paragraph is confusing

Surely the first paragraph should read "the time difference between the end of the first line of one frame or field of a raster display, and the beginning of the next" - "beginning" and "end" appear to be swapped round. Colindente 17:19, 2 November 2007 (UTC)