|
|
HD DVD Reference
Welcome to the HDTV Magazine HD DVD reference page. This page is based on our
HD DVD Primer article published in February 2006. We will cover on this page a general overview of HD DVD technology
as well as digging down to the specifics of the format and comparing those with the DVD format. You will also find below a list of
compatible hardware/players and a list of current movie titles and their availability.
Page Summary:
General HD DVD Overview
The basic disc structure is the same as DVD (size, layers, etc.), but the compression and laser technologies involved are completely different.
Traditional DVD's utilized a red laser for reading to and writing from the disc. HD DVD utilizes a new blue-violet laser. This new blue-violet laser
has a 405nm wavelength vs. the red laser's 650nm. This shorter wavelength allows for much higher data density since the blue laser can write
a much narrower data track. The net effect is that HD DVD can store more than 3 times the number of bits as traditional DVD's.
HD DVD also utilizes more advanced compression techniques than did traditional DVD. It can employ MPEG-4 AVC and VC-1 (aka Windows Media 9),
whereas traditional DVD's were strictly MPEG-2. These compression advances allow for roughly twice the data storage as traditional DVD. For a
direct comparison of these two specifications, see the table below:
In addition to improved video, HD DVD also features expanded audio support. Traditional DVD provided support for AC-3 (Dolby® Digital) and
MPEG codecs. HD DVD has added Dolby® Digital Plus (lossy) and DTS® (lossy) as mandatory codecs. Support for 2-channel
Linear PCM and 2-channel MLP (True HD) are also mandated. The HD DVD standard also allows for DTS® HD (lossless) as an optional codec.
With respect to the two currently available Toshiba units, the audio capabilities are equally as impressive as their video capabilities. Their press release says it best:
The mandatory audio formats for HD DVD include both lossy and lossless formats from Dolby Labs and DTS® - including the newly
developed Dolby® Digital Plus and DTS-HD.
The lossless mandatory formats include Linear PCM and Dolby TrueHD (only 2 Channel support is mandatory). The TrueHD format is bit-for-bit identical
to the high resolution studio masters and can support up to eight discrete full range channels of 24-bit/96k Hz audio. Another lossless format (specified
as an optional format) is DTS-HD. This employs high sampling rates of up to 192kHz.
Both models feature built-in multi-channel decoders for Dolby Digital, Dolby Digital Plus, Dolby TrueHD (2 channel), DTS and DTS-HD. The HD-XA1 employs
the use of four high performance DSP engines to decode the multi-channel streams of the wide array of audio formats. These high performance processors
will perform the required conversion process, as well as the extensive on-board Multi-Channel Signal Management including: User Selectable Crossovers,
Delay Management and Channel Level Management.
For content protection, HD DVD utilizes the Advanced Access Content System (AACS), which is a standard for content distribution and digital rights management.
For media that is AACS-enabled, these players will be required to recognize an Image Constraint Token (ICT), inserted into the movie data, and scale the analog output
(over component) down to 540p. This is still better than standard 480p DVD, but far from HD resolutions. As well as preventing illegal copying, AACS provides
"Managed Copy", which essentially allows content transfer from the HD DVD to other device (like a home media server). The decision to ICT-enable content is up to each
studio, and each studio is likely to go their own way.
Format Specifics & Comparisons
| |
DVD-ROM (Read-Only) | HD DVD-ROM (Read-Only) | HD DVD-R (Recordable) | HD DVD-Rewritable (Recordable) |
| 120mm | 120mm | 120mm | 120mm |
0.6mm x 2 substrates | 0.6mm x 2 substrates | 0.6mm x 2 substrates | 0.6mm x 2 substrates |
4.7GB 8.5GB | 15GB 30GB | 15GB | 20GB 32GB(Under development) |
4.7GB, SD resolution: 132minutes 8.5GB, SD resolution: 238minutes | 15GB, HD resolution: over 4 hours 30GB, HD resolution: over 8 hours | 15GB, HD resolution: over 4 hours | 20GB, HD resolution: over 5.5 hours 32GB, HD resolution: over 8.5 hours |
650nm (red laser) | 405nm (blue laser) | 405nm (blue laser) | 405nm (blue laser) |
| MPEG-2 | MPEG-4 AVC/ VC-1/MPEG-2 | MPEG-4 AVC/ VC-1/MPEG-2 | MPEG-4 AVC/ VC-1/MPEG-2 |
| 11.08Mbps | 36.55Mbps | 36.55Mbps | 36.55Mbps |
| 0.74µm | 0.40µm | 0.40µm | 0.34µm |
Hardware Available
Originally, the only manufacturer that had HD DVD players on the market was Toshiba, but recently RCA has nudged into the market. The
HD-XA1
($799.99) and the HD-A1 ($499.99)
are both backward-compatibile, allowing playback of older CD and DVD formats. Both players also support copy-protected playback via HDCP at 720p and 1080i over
HDMI, and will scale a traditional 480p DVD source to either 720p or 1080i to match your television's capabilities.
Toshiba also has two second-generation HD DVD players coming out by the end of the year. The
Toshiba HD-A2
($499.99) and the HD-XA2 ($999.99) will both support more advanced audio, while the HD-XA2 will be the first player to support 1080p output and will be
HDMI 1.3 compliant. Both models also load the media in about half the time of their first-generation counterparts and also sport an improved remote control.
While not a "player" in and of itself, Microsoft will be releasing the HD DVD add-on drive for the Xbox 360
in November 2006. This drive, when combined with the Xbox 360 Gaming Console will be fully compliant with the HD DVD specification and is rumored to support
1080p output via VGA connector.
| 720p, 1080i |
1.1 |
Now |
$499.99 |
$164.95 |
| 720p, 1080i |
1.1 |
Now |
$799.99 |
$279.00 |
| 720p, 1080i |
1.2a |
October 2006 |
$499.99 |
$157.03 |
| 720p, 1080i, 1080p |
1.3 |
December 2006 |
$999.99 |
N/A |
| 720p, 1080i |
1.1 |
Now |
$499.99 |
$359.99 |
| 720p, 1080i, 1080p |
N/A |
November 2006 |
$199.99 |
$119.99 |
Titles Available
16 Blocks -  New: $16.00 Used: $11.59 102m, 2.40:1 300 -  New: $11.68 Used: $10.99 116m, 2.40:1 Accepted -  New: $14.99 Used: $10.69 93m, 2.35:1 Aeon Flux -  New: $8.95 Used: $8.49 92m, 2.35:1 Alpha Dog -  New: $14.99 Used: $10.00 118m, 2.35:1 Apollo 13 -  New: $10.97 Used: $9.99 140m, 2.35:1 ATL -  New: $17.93 Used: $14.99 107m, 2.40:1 Babel -  New: $7.99 Used: $9.25 143m, 2.35:1 Breach -  New: $16.90 Used: $12.64 111m, 1.85:1 Bubble -  New: $11.99 Used: $16.49 73m, 2.40:1 Bullitt -  New: $15.49 Used: $11.59 114m, 2.40:1 Casino -  New: $11.36 Used: $11.24 179m, 2.35:1 Channels -  New: $12.99 Used: $11.42 107m, 1.33:1 Chronos -  New: $12.95 Used: $13.99 45m, 1.78:1 Clerks II -  New: $8.31 Used: $8.05 98m, 1.66:1 Darkman -  New: $7.69 Used: $7.55 96m, 1.85:1 Daylight -  New: $11.28 Used: $11.28 115m, 1.85:1 Disturbia -  New: $13.98 Used: $10.38 104m, 2.35:1 Elizabeth -  New: $11.25 Used: $11.28 124m, 1.85:1 Evening -  New: $15.49 Used: $12.69 117m, 2.40:1 Excalibur -  New: $15.99 Used: $13.91 140m, 1.85:1 Face Off -  New: $15.03 Used: $13.71 140m, 2.35:1 |