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- Newsgroups: rec.video
- Path: sparky!uunet!wupost!emory!swrinde!elroy.jpl.nasa.gov!ames!pacbell.com!unet!loren!larson
- From: larson@loren.net.com (Alan Larson)
- Subject: Re: Vertical Interval Data
- Message-ID: <1992Nov19.203808.3033@unet.net.com>
- Sender: news@unet.net.com
- Nntp-Posting-Host: loren
- Organization: none
- References: <42921118230024.0004381282NA2EM@mcimail.com>
- Date: Thu, 19 Nov 1992 20:38:08 GMT
- Lines: 23
-
- In article <42921118230024.0004381282NA2EM@mcimail.com> ALANH%WRQ@MCIMAIL.COM (Alan Haff) writes:
-
- > If memory serves, a dozen or so years ago several manufacturers offered
- > tvs that could 'read' data contained in the vertical interval. None of
- > them seem to waving flags about the capability today. What happened?
- > Do all of them do it now (putting the capability on par with electronic
- > tuning thus eliminating any marketing advantage)? Were the results
- > so unimpressive/detrimental the idea was dropped? Has the data been
- > changed/eliminated so it's no longer useful/accessible?
-
- As I recall, the signal was one used for adjusting the color properly.
- The system had some problems in that (1) it was not transmitted on all
- programs, and (2) it was not recorded by VCRs.
-
- Actually, it may have been recorded, but came back so distorted as
- to have been useless.
-
- Vertical interval test signals never seemed to become a standard,
- so I doubt that any consumer equipment depends on them nowdays. Since
- TV sets and transmission systems are so much more stable than in the
- past, I doubt that there is that much need.
-
- Alan
-