The difference between Blu-ray DVD and Hddvd

The difference between Blu-ray DVD and Hddvd

The current popular DVD technology uses a wavelength of 650nm red laser and digital aperture of 0.6 focus lens, the disc thickness of 0.6mm. Blu-ray DVD technology uses a wavelength of 450nm blue-violet laser, through the wide-angle lens on the ratio of 0.85 of the digital aperture, the focus of the light point of the size of the success of the small degree of reduction. In addition, the Blu-ray DVD's disc structure uses a 0.1mm thick optical transparent protective layer to reduce the disk in the rotation due to the tilt caused by the loss of read and write, which makes the disk data reading easier, and to greatly improve the storage density provides the possibility.

The track spacing of Blu-ray DVD discs is reduced to 0.32mm, only half of the current red DVD platter; The minimum diameter of the notch (or chemical phase change Unit) is 0.14mm and much smaller than the 0.4mm groove of the Red DVD disc. Blu-ray DVD single-sided Single-layer platters are defined as 23.3GB, 25GB, and 27GB, with the highest capacity (27GB) being nearly 6 times times the current mono-sided single-layer disk capacity (4.7GB), which is enough to store high-definition digital video content for more than 2 hours of playback time, or more than 13 hours of standard TV (VHS format image quality, 3.8mb/s). This is only one-sided single layer of capacity, like the traditional red DVD disc, Blu-ray DVD also can be made single-sided double, double-sided double.

Hddvd

The opposite of Blu-ray is the HD-DVD camp. Toshiba has joined the Blu-ray camp, but the distribution of benefits and related technical features lured Toshiba to withdraw from the group, instead uniting NEC to develop advanced optical Disk, and Dvd-forum's support was renamed HD-DVD. Because the Blu-ray DVD is incompatible with the current DVD format, it directly increases the cost of the manufacturer's transition to Blu-ray DVD production environment, thus greatly delaying the process of Blu-ray becoming the next-generation DVD standard. But another DVD forum's main member, Toshiba, has brought a new AOD (Advanced optical disk) CD that is completely incompatible with Blu-ray. The biggest advantage of the AOD technology, launched by Toshiba and NEC, is that it is compatible with the current DVD and is much less difficult to produce than Blu-ray DVDs.

Chinese version of the Hddvd

Hddvd Chinese version of technology has actually passed the DVD Forum review in early November 2006, and the February 27, 2007 DVD Forum approved HDDVD Chinese version of the technical standards are exactly the same, C-hddvd-rom (China HD CD-ROM) physical specifications were eventually passed, The version number is 10.0, and the specification is for mainland China only. The Chinese version of the HDDVD technical standards officially endorsed by the DVD Forum, marking the Chinese version of the HDDVD technical standards of the approval process has been all gone. The next point will be to achieve industrialization, the early production of Chinese version of the Hddvd player.

The HD-DVD disc has a physical specification of 12cm diameter, thick 1.2mm (including two 0.6mm thick substrates), and single layer capacity 15GB. The difference in the Chinese version is the modulation and decoding of different, for the FSM codec technology, the global version is ETM technology. One of the goals of producing a Chinese version of Hddvd player is that the price is cheaper than that of a foreign product.

EVD Technology

EVD system is the upgrading of DVD products, EVD (Enhanced versatile disk) is called "Enhanced high-density digital laser disk System", from the published EVD technology patents, mainly audio/video filter transformation, coding/decoding optimization methods, function is to improve the quality of audio screen, and increase data compression ratio. There are also inherited from the SVCD "digital video on the dynamic superposition of subtitles" method, the subtitle can be 256-color display. including 5 software, respectively, "DVD-EVD conversion software", "AC3-EAC conversion software", "Ogt production System", "EVD digital video Disk production system" and "VCD/DVD/EVD player". "EVD" is the Chinese have independent intellectual property rights of the digital optical disc system, but also the Chinese Digital optical disc field of national standards. EVD System technical specifications have been submitted to the International Electrotechnical Organization and ISO, is expected to become international standards. To provide users with a clearer program, EVD system in the original DVD technology on the basis of speed up the code stream nearly one times, the image resolution of 5 times times the DVD, to achieve more shocking voice, more beautiful subtitles and more flexible choice. The main technical features are:

In terms of video, the system not only realizes the standard definition, but also realizes 8 kinds of video quality from VCD quality to high definition, and fully supports all kinds of use requirements including High-definition Digital TV, which can be used directly as test equipment and home entertainment equipment in High-definition digital TV production.

In audio, the system uses the independent intellectual property rights of the EAC audio compression technology, not only fully support mono, dual channels and 5.1 channels, in audio quality is also superior to the current DVD player is usually used and charge a high license fee Dolby AC-3.

In the subtitle aspect, the system inherits and develops the super VCD The research achievement, realizes the 256 color to be able to float the caption, and supports the transparent color, the caption display quality and the flexibility far surpasses the DVD subtitles.