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High Quality Video |
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| DVD provides much higher video resolution than LD or CD. The resolution
of VHS video is commonly gauged at 240 lines of horizontal resolution,
laserdisc at 420, and DVD at over 500 - the highest of existing video
media. In addition, DVD maintains the same high resolution without
regards to how many times it is used. |
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[Horizontal Resolution]
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High Quality Audio |
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| Developed by Dolby Laboratories as the AV system of the next generation,
the 5.1 channel Dolby Digital offers high-quality audio and very realistic
embodiment of the video images. The 5.1 channel system divides the
sound into five discrete streams. |
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| The "0.1" in "5.1" is a a low-frequency effects
(LFE) bass channel (called a "0.1" channel because it covers
only a fraction of the frequency range of the main channels). Very
realistic results can be achieved with the five speakers and one sub-woofer,
which display the audio data from all directions. With the Dolby Digital,
people can enjoy cinema-like sound effects right at their home. |
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| In addition, the Dolby Digital supports downmix of the 5.1 channels
into a two-channel format; therefore, it is compatible with two-channel
stereo systems like TVs or regular amplifiers. Following is how the
Dolby Digital amplifiers and speakers are connected to provide 5.1
discrete channels. |
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| ▶ [Reference] Audio Systems |
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| (1) DOLBY SURROUND |
| The oldest surround sound system Dolby Surround has three channels:
left, right and surround. The third surround sound does not come from
an independent source;rather, it is a mixture of left and right channels. |
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| (2) DOLBY SURROUNG PROLOGIC |
| Now the most widely used system, Dolby Surround ProLogic is a kind
of extension to Dolby Surround. The technology derives four channels
(left, right, center, surround) from a two-channel source, thus creating
surround effects out of sound sources that have not been encoded as
surround sound. This is the home theater equivalent of Dolby Stereo
for films. |
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| (3) DIGITAL THEATER SYSTEM(DTS) |
Digital Theater System (DTS) is competing with Dolby Digital to
be a dominant audio format for DVD and theater audio system. DTS is
a discrete digital 5.1 surround sound format offering multi channels.
Due to its much lower compression rate, DTS provides higher audio
quality.
DTS owes much of its current success to Steven Spielberg's blockbuster
Jurassic Park, which introduced the crisp sound of DTS to the world.
With the digital output connected to a DTS amp, DVD and Laserdisc
players can display DTS soundtracks. Most of the current DVD players
on the market support DTS digital output. |
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High Capacity |
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"A complete movie on a single disc"
DVD is a multimedia data storage medium with high capacity. The audio
and video quality which results from MPEG-2 compression far surpasses
that of MPEG-1; however, it also requires higher data storage space.
To overcome this, compression rate and transfer rate are adjusted
based on the amount of data involved. This is a method of compression
optimized for space increase and better video quality. |
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[DVD Capacity]
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Multi-Function |
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| (1) Multi-language
function |
"Up to 8 languages and 32 different subtitles"
People can enjoy a DVD title without closed caption, or with any of
the 32 different subtitles. Or they can choose from a pool of up to
8 different languages including English, Chinese and German. This
is a particularly good feature for education. |
 Different titles may have different number of language versions depending
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| (2) Multi-aspect function |
| Unlike a tape, video CD or laserdisc, DVD titles are
good for both 16:9 wide-aspect TVs and conventional 4:3 aspect-ratio
sets. |
| DVD titles should be formatted in 16:9 wide aspect for view in a widescreen. |
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＃Widescreen 16:9 TV: Wide mode
＃Fullscreen 4:3 TV: Letter Box, Pan & Scan mode |
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| ▶ [Reference] 16:9 Wide, Letter
Box and Pan ＆ Scan Formats |
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[LETTER BOX]
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[PAN＆SCAN]
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[ anamorphic 16:9
enhancement]
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| With Letter Box, wide-aspect images are reduced with black
bars at top and bottom of the image for effective display on a 4:3
screen. |
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Pan & Scan was designed as an alternative to the reduced
image of Letter Box. With Pan & Scan, some side portions of wide-aspect
images that are deemed not important are deleted to fit a 4:3 format.
As a result, the same images can have totally different effects depending
on the ability of the image editors. |
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It is due to the development of widescreen TVs (16:9 aspect
ratio), which have a width-to-height ratio similar to movie theater
screens, that you can enjoy cinema-style entertainment right in
your own home.
The anamorphic 16:9 enhancement provides more realistic cinema-style
effects on widescreen TVs. The anamorphic images are in the format
of 16:9 aspect ratio, not of 4:3 ratio. So the image of anamorphic
format looks wrong, as if squished from the left and right, on regular
4:3 TVs. Most DVD players support transforming the anamorphic format
into the Letter Box one so that people with 4:3 TVs could enjoy
the titles in anamorphic format.
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| (3) Multi-angle function |
| Since up to 9 different pictures recorded simultaneously
by multiple cameras can be stored, you can select the angle you prefer,
especially when watching music videos or sporting events. |
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| (4) Multi-story function |
| With the movie titles of a mult-story format,
this function allows users to select the story development they want,
or select from a menu screen at key turning points, so that various
story developments and ends can be enjoyed. Movies can end in happiness
or in tragedy depending on your tastes. |
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