صفحه 1:
All You Need to Know
about DVD Technology
By Rachel Shankles, LMS
Lakeside High School
۱۰۸
Hot Springs, AR
صفحه 2:
Who invented DVDs?
Toshiba engineers
invented this technology
for use with games and for
3-D effects
صفحه 3:
What does DVD stand
for?
Originally it meant ‘digital
versatile device’ but now
‘digital video disc’ is the
most accepted definition.
صفحه 4:
History
= Toshiba invented it for gaming industry
= Movie makers bought in like like
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= Disney finally bought in
= DVD unencryption code trade secrets
posted to Internet and lawsuit ensued
in 1999 (ruled on in 2003)
= DVD player prices lowered
= DVD movies abundant for rental or
purchase
= DVD replaces VHS, laser disc, audio
cds, & game technologies
صفحه 5:
How it works
= DVDs look exactly like CD-ROMS
= The data is layered
= The laser reads at an angle to see every
layer
= The tracks are closer together and smaller
with better compression technology
= Some discs are double-sided, double-
layered and others are single-sided
= Holds up to 7 gigabytes - 7 times more
than a cd.
= Multiple language tracks & screen formats
صفحه 6:
Quality (540 lines of
resolution)
= Better sound than any audio cd (Dolby
AC3)
= Better picture quality than laser disc
(425 lines)
= Higher storage capabilities (4.7 gig
per side - 133 minutes of video per
side up to 7 gig total)
= Multiple camera angles (screen
formats)
= Better resolution than VHS (210
lines)
صفحه 7:
Drawbacks to DVDs
They wear out and have to be refinished after 7
to 15 uses, even with normal wear and tear
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cheaper
You can pay to send to Internet providers to
resurface (1-10 discs would be $4 each plus s&h)
Find a Game business, video rental store, or
radio station that might have a machine locally
and they may charge about $5 each
If a hole can be seen all the way thru the plastic,
it can not be repaired & cracks can not be
repaired
Why resurface? With scratches and blemishes
the laser can not reflect properly so the image is
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صفحه 8:
DVD burners
= Not standardized as yet
= 5 basic types of blank DVD discs - you
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burner software specs—keep the
paperwork
= DVD-Rom (just reads data), DVD-Ram
(not read by most DVD players just
computers), DVD-R & DVD-RW (minus
RW = These read DVD discs and write to
DVD-recordables and DVD-rewritables),
DVD-R+/RW ( Plus RW = more expensive
but can read most)
= More info try www.cdrfaq.or and
www.dvddemystified.com and see the
FAQs section
صفحه 9:
Warning: Copying DVDs
= It is illegal to change the format of
commetcially purchased video
= You can not change your VCR collection
to DVD
= You can not change DVD movies back to
VHS format
= DMCA - Digital Millennium Copyright Act
= Exception: if the movie you originally
bought on VHS is not available in DVD
= Home movies you can copy to any format
= DVDs are encrypted - the software to
copy them is complicated, especially if
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صفحه 10:
۱۸۱۸۵۱۰۱ next?
EVD - Extended Video
Disc
Why? Toshiba charges
copyright fee every
time anyone makes a
DVD
صفحه 11:
Shankles@LS1.dsc.k12.ar.us
Shankles@cablelynx.com
Work 501-262-1530