There is a lot of confusion regarding the various standards,
specifications and technical issues regarding DVD's and DVD
players. Here are ten of the most popular along with the facts that
hopefully will help put your mind at rest.
Laptop Battery
1 - Not HDTV compatible.
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Thinkpad Current DVD players are compatible with HDTVs in the same way
VCRs, camcorders, and laserdisc players are compatible. In order to
take take advantage of the digital nature and progressive scan of
HDTV, new DVD players will be required. These players will make
current discs look even better on HDTVs, but won't provide full
HDTV resolution. Eventually a new "HD-DVD"; format will appear,
based on blue lasers. The new format will require new discs and new
players, but the players will play old DVD discs and CDs.
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Microsoft
2 - DVD is unfinished, with competing formats.
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Laptop Computers The DVD-ROM and DVD-Video standards are finalized as single
formats. There were once two competing formats (SD and MMCD) but
they were combined to form DVD back in 1995. DVD-Audio is also
finalized. There is no reason to delay buying DVD players or discs
because of rumors that it might change. On the other hand, there
are a number of competing, incompatible DVD recording formats
(DVD-R/RW, DVD+R/RW, and DVD-RAM). It will take a while before the
recordable DVD mess gets sorted out.
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Laptop Computer
3 - Dolby Digital is 5.1 channels.
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Desktop Computer Dolby Digital (formerly called AC-3) carries from 1 to 5
channels of compressed digital audio, with an optional ".1"
low-frequency effects (LFE) channel. The Dolby Digital track does
not have to include 5.1 channels. It may be mono or stereo, and the
stereo may or may not be Dolby Surround encoded (for playback on a
system with a Dolby Pro Logic decoder).
Notebooks
4 - Audio is only 12 bits.
Lenovo This myth was started by an article in Widescreen Review
magazine that attempted to equate jitter in DVD players to a
reduced audio resolution. DVD audio can be either 16, 20, or 24
bits. Jitter does not reduce the number of bits. There are many
kinds of jitter. Jitter in the channel signal is accounted for in
the readout circuitry. Jitter in the digital audio output is
related to the audio circuitry and is independent of the DVD
format. It's true that jitter at different stages can reduce audio
quality, but comparing it to a 12-bit sample size is naive and
inaccurate. Numerous reviews indicate that most DVD players sound
as good or better than most CD transports.
Hard Drive
5 - Audio level too low.
Travelstar In truth the audio level is too high on everything else. Movie
soundtracks are extremely dynamic, ranging from near silence to
intense explosions. In order to support an increased dynamic range
and hit peaks (near the 2V RMS limit) without distortion, the
average sound level must be lower. This is why the line volume from
DVD players is lower than from almost all other sources.
Gateway
6 - 133 minutes per side.
Laptop Parts This is a meaninglessly exact figure. A single-layer disc can
easily hold 150 minutes at the typical average video data rate if
there's only one audio track. Lowering the data rate slightly can
accommodate over three hours on a single layer. Dual-layer discs
can hold over four hours on one side.
Software
7 - Playing CDs is harmful.
Hard Drives Playing an audio CD in a DVD player will not hurt the disc or
the player. Some players use a single laser for reading DVDs and
CDs, while others have separate lasers, but in either case there is
nothing about the lasers that can damage a CD, nor is there
anything about a CD that can affect the player.
Electronics
8 - Digital artifacts.
Canon Many reports of "artifacts" on DVD turn out on examination to
have nothing to do with MPEG compression. Artifacts come from many
sources: film problems, bad video transfer, improper TV settings,
bad video connections, electrical interference, player faults, disc
read errors, etc. Some of these can be corrected by adjusting the
TV or cleaning the disc. Most DVDs exhibit few visible compression
artifacts on a properly configured system. If you think otherwise,
you are probably misinterpreting what you see.
Desktop Pc
9 - Players can't read dual-layer discs.
Desktop Computers All DVD-Video players and all DVD-ROM drives are required to
play dual-layer discs. A few faulty units might have problems
reading dual-layer discs. Dual-sided discs must be flipped over by
hand. (Only a few multi-disc changers can flip discs
automatically.)
Think Pad
10 - DVD is a worldwide standard.
Repair In addition to regional codes that can be used to prevent
playback in different areas, DVD uses different formats for NTSC or
PAL playback. Almost no US players can play PAL DVDs. All PAL
players can play both PAL and NTSC DVDs, but only on a
60-Hz-capable PAL TV or a multistandard TV. Most DVD-equipped
computers can play both NTSC and PAL discs.
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