Term Papers on DVD: WHAT IT DOES

Term Paper Title	DVD: WHAT IT DOES
# of Words	1100
# of Pages (250 words per page double spaced)	4.4

DVDs

                         DVD: WHAT IT DOES

     DVD, which simply stands for Digital Video Disc (or Digital Versatile
Disc) is the latest audio/video storage medium to hit the market.  DVD discs
look exactly like normal compact discs and they possess the technology to
provide hours of high quality video and audio entertainment.

                         DVD: HOW IT WORKS

     Although complex, the basics of how a DVD works is rather simple,
even comparable to how old vinyl record albums function.  A DVD disc
spins at a very high rate, and a laser beam "reads" across the surface of the
disc, picking up all the data stored on it and sends it to the internal decoding
circuity inside a DVD player.  DVDs can hold so much data because not only
does the disc spin very, very fast, but developers were able to pack the
grooves the laser follows very tightly together, and very refined and sharp
lasers were developed to read them.  What the laser is actually "reading" are
millions of tiny indentations on the disc surface.  The laser light hits these
indentations (which are only in two positions, "up" or "down"), and bounces
the light back, relaying what position the indentation is.  These "up" or
"down" positions correspond to 1's and 0's, which is the basis for a digital bit
stream.  The way the 1's and 0's are arranged in the bit stream forms a series
of  codes that tell a DVD player what to do.  The decoder in the player then
converts these encoded digital commands into the images and sounds we can
see and hear.

                         DVD:  ADVANTAGES

     DVD has many features.  It include superior audio/video capabilities,
as well as interactive features. Some of these features include:
          *  Over 2 hours of high quality digital video (8 hours on a
double sided, dual layered disc)
          *  Support for widescreen movies on standard widescreen TVs
          *  Up to 8 tracks of digital audio
          *  Subtitle and Karaoke capability (up to 32 tracks)
          *  Instant rewind and fast forward
          *  More durable than VHS videos (won't wear out)
          *  Automatic "seamless" branching of video (for multiple
storylines or ratings on one disc)
          *  Up to 9 camera angles (different camera views can be
selected during playback
          *  Multilingual identifying text for title name, album name, song
name, cast etc.
          *  Menus and simple interactive features (for games, quizzes
etc.).
          *  Not susceptible to magnetic fields.  Resistant to heat.

     Although these features are very appealing, not all DVD players have
these features.  But the following features are supported on mostly all DVD
players:


          *  Language choice (for automatic selection of  video scenes,
audio tracks, subtitle tracks and menus)
          *  Special effects playback: freeze, stop, slow, fast, and scan (no
reverse play or reverse step)
          *  Parental lock (for denying playback of discs or scenes with
objectional material)
          *  Programmability 9playback of selected sections in a desired
sequence)
          *  Random play and repeat play
          *  Digital audio output (PCM stereo and Dolby Digital)
          *  Compatible with audio CDs

     These are pretty much the standard features, but these next feature are
the crowning jewel for DVDs.  Only select machines have these features:

          *  Component (YUV or RGB) video output for higher quality
picture.
          *  Progressive-scan component (YUV or RGB) output for
higher-quality analog picture.
          *  Six channel analog output from internal audio decoder.
          *  Recognition and output of DTS Digital Surround aud...

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