Thread View: comp.ivideodisc
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Started by TAMIL
Sun, 13 Dec 1992 23:16
An interesting sujestion.
Author: TAMIL
Date: Sun, 13 Dec 1992 23:16
Date: Sun, 13 Dec 1992 23:16
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OK, I was thinking about this for couple of days now, since CD-ROM, and
video disk uses about the same kind of procedure to read data
why cant we make the video disk to read digital data we cab store
all the info in digital format rather then analog, by my calulation a
video disk can hold about 6.5 GByte of Data.
HDTV movies can be distrubuted, or we can send out 10 hours of music.
jay
Re: An interesting sujestion.
Author: Bob Niland
Date: Mon, 14 Dec 1992 17:09
Date: Mon, 14 Dec 1992 17:09
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TAMIL@QUCDN.QueensU.CA) wrote:
> OK, I was thinking about this for couple of days now, since CD-ROM, and
> video disk uses about the same kind of procedure to read data
> why cant we make the video disk to read digital data we cab store
> all the info in digital format rather then analog, by my calulation a
> video disk can hold about 6.5 GByte of Data.
LDs don't use the same kind of procedure. The laser frequency is the same,
and the pits are 1/4-wave reflective, but the LD signal is pulse-FM analog
(at about 9MHz) rather than the raw 1.5MHz binary stream of CD. LD is
analog video, analog audio, and optionally digital audio. The digital audio
is a binary stream added to the pulse-FM carrier at -26dB, essentially
becoming a duty-cyle modulation of the FM.
If RedBook (CD) format was used on LD, the capacity would be impressive. As
it is, an "LD-ROM" (using the digital audio channel for data) only stores
600 Mbytes (or less) per CLV side, since LDs are 60 minutes per side,
compared to CDs at 72 min/side.
Regards, Hewlett-Packard
Bob Niland Internet: rjn@FC.HP.COM 3404 East Harmony Road
CompuServe: 71044,2124 Ft Collins CO 80525-9599
This article represents only the opinion[s] of its author, and is not an
official or unofficial position of, or statement by, the Hewlett-Packard
Company. The text is provided for informational purposes only. It is
supplied without warranty of any kind.
Re: An interesting sujestion.
Author: Thomas M Farrell
Date: Mon, 14 Dec 1992 22:12
Date: Mon, 14 Dec 1992 22:12
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I seem to recall that somebody did actually make a LD size data drive, but it didn't catch on. (too expensive, read only. At the time, anyway.) Tom
Re: An interesting sujestion.
Author: TAMIL
Date: Tue, 15 Dec 1992 08:54
Date: Tue, 15 Dec 1992 08:54
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Well, AT@T had a LD size WORM disk , but it cost about $50,000 when I checked last time. It can store about 6.5 Gig, but my question is why cant thay make LD size CD-ROM's, in mass production a LD drive to read data would cost same as a reguler LD. As we see the progress on Quick Time and other Digital based video, I see this type of device is the best suted to sell HDTV type of films. jay tamil@qucdn.queensu.ca
Re: An interesting sujestion.
Author: David Alan Gilbert
Date: Wed, 16 Dec 1992 10:37
Date: Wed, 16 Dec 1992 10:37
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In <92348.181637TAMIL@QUCDN.QueensU.CA> TAMIL@QUCDN.QueensU.CA writes: >OK, I was thinking about this for couple of days now, since CD-ROM, and >video disk uses about the same kind of procedure to read data >why cant we make the video disk to read digital data we cab store >all the info in digital format rather then analog, by my calulation a >video disk can hold about 6.5 GByte of Data. > HDTV movies can be distrubuted, or we can send out 10 hours of music. >jay I think there is such a standard - something like digital interactive video or something like that - but to be honest I cant remember the name for it - I dont know any details of it , but if you find anything out I would be greatful if you could forward info. to me. Dave -- ------------------------------------------------------------------------------- - David Alan Gilbert - gilbertd@cs.man.ac.uk - G7FHJ@GB7CRG - ------(Programmers don't sleep - they just park their heads)-------------------
Re: An interesting sujestion.
Author: martens p
Date: Fri, 18 Dec 1992 11:32
Date: Fri, 18 Dec 1992 11:32
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In article <gilbertd.724502222@cs.man.ac.uk> gilbertd@cs.man.ac.uk (David Alan Gilbert) writes: >In <92348.181637TAMIL@QUCDN.QueensU.CA> TAMIL@QUCDN.QueensU.CA writes: > >>OK, I was thinking about this for couple of days now, since CD-ROM, and >>video disk uses about the same kind of procedure to read data >>why cant we make the video disk to read digital data we cab store >>all the info in digital format rather then analog, by my calulation a >>video disk can hold about 6.5 GByte of Data. > >> HDTV movies can be distrubuted, or we can send out 10 hours of music. > >>jay > >I think there is such a standard - something like digital interactive video >or something like that - but to be honest I cant remember >the name for it - I dont know any details of it , but if you find >anything out I would be greatful if you could forward info. to me. > >Dave CD-I is a standardized way to have interactive video and audio, but on a special CD, not laserdisk. With the MPEG extension (audio/video compression), 1 hour of VHS-quality full-motion can be stored on a CD, or 7 hours of music. Commercially available next year. Was that what you were looking for? Peter Martens
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