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DVD
Technical FAQ
They
[DVD discs] look like Compact Discs. What's the
big deal?
How
long will DVD movies play before I have to turn
the disc over?
Will
DVD movies play on my current CD player?
What is the digital audio output on the back of my
DVD player for?
What are the advantages of Dolby¨ Digital
Surround AC-3?
Will DVD discs wear out, like VHS movies?
What is an Aspect Ratio? Why is it important?
I do not own a Dolby Digital Surround AC-3
receiver. Can I still enjoy my Home Theater audio
system with DVD?
My television set has Composite and S-Video
inputs. What is the best way to connect my DVD
player?
Are there any other adjustments I should make to
my television to take advantage of S-Video?
Just how good is the DVD picture?
Is DVD picture quality better than Laserdisc?
Is it [DVD] better than DSS?
Do I need a Widescreen TV to play 16:9 movies?
They
[DVD discs] look like Compact Discs. What's the
big deal?
DVD
discs are the same diameter (120mm) and
thickness (1.2mm) as a Compact Disc, but that is
where the similarities end. A single DVD disc
has the capability to store up to 13 times the
data contained on a CD, on one side! If you
factor in DVD's capability to utilize both sides
of a disc for data storage, you have an
information marvel that offers 26 times the
power of a Compact Disc!
That
enhanced capability is a tremendous enabling
device. DVD will revolutionize Multimedia,
information retrieval and storage and mobile
navigation. DVD will create new high quality
audio standards, impact learning and training
videos, and bring the Cinema experience to Home
Entertainment.
How
long will DVD movies play before I have to turn
the disc over?
At
an average bit rate of 4.5Mbs, a single sided
DVD disc has the playback capability of 133
minutes of the highest quality audio and video
images. That's nearly 92% of all Hollywood
titles ever made!
In
fact, a dual layer DVD disc can provide up to 4
hours of the highest quality audio and video on
a single side of the disc!
Will
DVD movies play on my current CD player?
No,
you will require a DVD player that is equipped
to read the pits and lands of a DVD disc and
decode the MPEG-2 data signal.
What is the digital audio output on the back of my
DVD player for?
This
connector outputs a digital data stream that may
be sent to an outboard D/A converter for 2
channel audio processing. More importantly, it
may be connected to an audio receiver equipped
with a Dolby AC-3 processor for multi-channel
audio decoding.
What are the advantages of Dolby¨ Digital
Surround AC-3?
Dolby
Digital Surround offers discrete processing of 5
independent channels ( Left, Center, Right, Left
Surround, Right Surround, and an additional
effects channel that may be routed to a
subwoofer) of audio information. Dolby Digital
Surround provides the producers of movie
soundtracks added flexibility and creativity in
the studio that results in more realism, and a
"you are there experience." Each of
the 5 Audio channels is a full range (20-20khz)
signal. The discrete nature of Dolby Digital
Surround provides increased clarity (especially
critical for dialogue) and spatial realism. With
Dolby Digital Surround, audio images may be
panned across the front of the room; from front
to rear; from rear to front; and even
diagonally.
Will DVD discs wear out, like VHS movies?
No.
The picture quality of the DVD disc is
consistent from the first play to the thousandth
play. Plus, DVD discs will not deteriorate over
time, are unaffected by magnetic fields (which
can literally erase a VHS cassette) and do not
require rewinding after viewing.
What is an Aspect Ratio? Why is it important?
Aspect
ratio refers to the ratio of width to height of
a television set. Traditional television sets
have a 4:3 aspect ratio. Widescreen television
sets have a 16:9 aspect ratio. Traditional
television sets are almost square in appearance;
widescreen displays are more rectangular.
The
DVD defines the capability to display movies in
3 different ways:
- Widescreen,
which provides a special "anamorphic
video" signal that, when processed by a
widescreen television set, fills the entire
screen and delivers optimum picture quality.
- Pan
and Scan, a version that fills the screen of
traditional 4:3 television sets with an
entire picture, much like watching network
movies.
- Letterbox
mode, which provides horizontal bands at the
top and bottom to, in essence, create a
widescreen picture in a traditional
television set.
Each
of the 3 display modes, if provided by the
Hollywood producer, may be selected for viewing
if the viewing device (player or DVD-ROM
playback sub-system) is so equipped.
I do not own a Dolby Digital Surround AC-3
receiver. Can I still enjoy my Home Theater audio
system with DVD?
Yes,
every DVD player currently on the market has
analog ( Left and Right ) audio outputs that you
can connect to your Dolby Surround Sound, or
Pro-Logic receiver. The analog audio outputs of
your DVD player passes through specially encoded
Dolby Surround Sound signals.
My television set has Composite and S-Video
inputs. What is the best way to connect my DVD
player?
DVD
is a format that will provide significant
picture quality advantages when connected to
your television set via the S-Video connectors.
Your DVD player must have S-Video output to take
advantage of this capability.
Are there any other adjustments I should make to
my television to take advantage of S-Video?
Yes.
The color detail signal is so rich, you will
find that you do not need to turn your sharpness
control up when watching DVD. In fact, in many
television sets, you will optimize picture
quality by turning the sharpness control off!
Just how good is the DVD picture?
Based
upon pixel resolution, color resolution, color
detail, black level reproduction and a virtual
lack of color noise, the DVD picture is nearly 3
times better than conventional VHS.
Is DVD picture quality better than Laserdisc?
Yes.
DVD is component video, Laserdisc is composite
video. The DVD picture is characterized by more
color detail, and color resolution and contains
significantly less NTSC picture artifacts than
Laserdisc. It is generally accepted that a
Laserdisc is capable of producing 400-425
horizontal lines of resolution. A DVD disc
produces in the range of 480-500 horizontal
lines of resolution. A single sided 4.7"
(120mm) dual layer DVD disc can store up to 4
hours of the highest quality audio and video
images. A 12" Laserdisc can only store 60
minutes on a single side. And DVD movies will
play on your computer equipped with a DVD-ROM
and appropriate MEPG decode devices. DVD is the
realization of true cross-platform multimedia.
Is it [DVD] better than DSS?
Yes.
DVD is mastered as CCIR601 4:2:2 digital
component video and utilizes 100% MPEG-2 data
reduction. DSS, on the other hand, is 4:1:1
digital component video and features scaleable
compression schemes that vary from MPEG-1 to
MPEG-2. In fact, the digital component video
signal of DVD has the capability to rival the
best studio masters.
Do I need a Widescreen TV to play 16:9 movies?
A
DVD-player can be connected to any television,
but with a Widescreen TV you will get the most
viewing enjoyment. With DVD-Video you can
gradually build up your own Home Cinema system
with widescreen TV and multichannel digital
surround sound. DVD-Video supports multiple
aspect ratios. Video stored on a DVD in 16:9
format is horizontally squeezed to a 4:3
(standard TV) ratio. On Wide-screen TVs, the
squeezed image is enlarged by the TV to an
aspect ratio of 16:9.
DVD
video players output widescreen video in three
different ways:
- Letterbox
(for 4:3 screens)
- Pan
& scan (for 4:3 screens)
- Anamorphic
or unchanged (for wide screens)
In
widescreen or letterbox mode, if a movie is
wider than 16:9 (and most are), additional thin
black bars will be added to the top and bottom
at production time or the sides will be cropped.
Video stored in 4:3 format is not changed by the
player. It will appear normally on a 4:3 screen.
Widescreen systems will either stretch it
horizontally or add black bars to the sides.
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