Articles

What is the HD - High Definition?

by blazevideo

Tthere are four means for HD: HDTV, HD movies, high-definition format, HD equipment.

HDTV
Means supporting 1080i, 720P and 1080P TV standards. The big-screen LCD televisions, general support for 1080i and 720P, and some so-called "Full HD", it is the TV that supports 1080P output. The current high-definition television digital signal, even 720P.

HD Movies
The traditional DVD discs offer definition of 480 lines can no longer meet our daily needs, so the new standard, large-capacity optical disc format will emerge. They are now the HD DVD and Blu-ray discs. Also because of new standards, the emergence of new specifications to make a single disc can store double the amount of data to be growth-style, making the HD DVD and Blu-ray disc of the DVD can be up to 1080 lines (1080i and 1080p) video output specifications. Here's a brief introduction about the two new high-definition optical disc specifications of the relevant parameters.

HD DVD
The main selling point of HD-DVD specifications is the HD-DVD and standard DVD share part of the structural design, DVD specifications of the manufacturer does not need to upgrade, re-enter the huge capital to make new equipment. Blu-ray manufacturers have to produce a new specification, purchase new production equipment. At present, due to Toshiba announced stop production of HD DVD and related equipment, declared bankruptcy this standard.

Blu-ray Disc
Blu-ray Disc abbreviated as BD. Adopted a new physical format allows high-density 23-27G each capable of storing the amount of data, double layer Blu-ray disc capacity up to 50G. Blu-ray can record 2 hours of digital high-definition video or more than 13 hours of standard TV broadcasts (equivalent to VHS quality home video systems, data flow of about 3.8Mbps).



High-definition format

Due to the huge amount of high-definition video data transmission, so there is need for new compression algorithms. Now the HD audio formats are: DTS, Dolby Digital, Dolby TrueHD, LPCM, etc.. Video format are: H.264, WMA-HD, MPEG2-TS, MPEG4 and VC-1 and so on. Which, H.264 format is currently the most popular one. So, when buying high-definition disc player, or video card, it is necessary to figure out whether the device supports H.264 or not. Such as Nvidia's 8400G graphics card does not support H.264, the 8400GS support. ATi HD 2000 series from the beginning in addition to HD 2900XT graphics card than the full support of H.264 and VC-1 encoded HD movies hardware decoding.

HD Equipment
Most of the rear projection, LCD, plasma and other display devices is not necessarily able to reach the resolution of the signal source, in other words, the display device display lower quality than the source signal. Survey show that a projector can perfectly demonstrate HDTV display, projector is the most desired playback device. The greatest advantage of projector is the big screen, you can easily reach 100 inches or more, visual impact is very strong. Most video projectors currently only supports 720p and 1080i resolution format, and a few support 1080p resolution format. But even the 720p projector screen, its much higher resolution than DVD, the DVD is currently only available for a 480i or 480p output format.

As a traditional display device, the maximum size of TV is 50 inches or so, the screen is the default 4:3 aspect ratio, and the snow, blinking too often, it can not meet people's demand for large screen display. Although there are TV which can support for 16:9 and 4:3 modes of large-screen TV, such as plasma TVs, projection TVs, LCD TVs, etc., but they are also difficult to break through the limits of 100 inches, compared to the projector's 100 to 300 inches would look shabby. And the traditional TV set too large, too bulky, heat generation too high, easy to be scratching the mirror, mirror reflection interference, and also too expensive.

By contrast, as a new generation of display devices, projector has become a universal application in the field of education and business, and show a very large domestic market potential. The advantages: high picture quality, the projector can output 1080i, 720p or higher signal formats, and can compatible with different signals; large screen display, the projector can easily achieve 100 inches or more of the large screen display; and a advantage that any TV can not reach, that is, free to adjust the size of the projector screen, and its mobility allows you to use it at different places. Therefore, the combination of HDTV and projector will be revolutionary.


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Joined APSense since, November 29th, 2007, From Eden Prairie, United States.

Created on Dec 31st 1969 18:00. Viewed 0 times.

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