20 Mar 10 Five Formats Of DVD Technology
Music consumers in a new era in the 1980s, when she first introduced in the digital medium of CDs. On the film side at home were the consumers to the VHS, ie glued Video Home System, Volume until the 1980s. This was also non-digital, but gradually replaced by CDs, the digital VHS in the late 1980s.
Film companies were not happy with the CDs that were available and worked for various digital video formats into a product that would give improved visual developmentand audio quality on the homepage of the consumer. The result was the development of the DVD. The DVD technology in the early 1990s and was immediately entertainment such as Time Warner and Sony realized and agreed to promote the new, high-quality technology.
DVD stands for Digital Versatile Disc, although it is popularly known as digital video disc due to popularity in the video industry. The main reason for the popularity and growth of DVD is that DVD technology allowsstoring a large amount of data using digital technology.
In this moment, DVD provides over 480 lines of resolution that is twice that of the 20 lines of the VHS format. The 480 lines at best to a progressive DVD player to see the 40 to convert interlaced video into a line 480 progressive format. The progressive display has a 31.5 kHz or higher scan rate. This means that all traces of the scan delay accounts and offers a TV screen.
DVD technology is very different from the CD, includingalthough they are very similar in appearance. A DVD consists of a thin, circular wafers made of clear plastic and metal measuring 4.75 "in diameter with a small hole made in the middle. The thickness is 0.2 inch and two such discs are compressed to a double-sided disc 0.04 inches thick.
The digital data, which consists of the binary language of ones and zeros, is on a master CD and the master disc is coded then used to create self-copies. The deal is done by burning smallHoles, called pits, in a microscopic layer of metal, usually aluminum, with the help of a laser. These mines are the binary ones. Binary zeros are the smooth surface of the layer of metal that has not been affected by the metal binary zeros. Then the metal is coated with a protective transparent layer.
Five physical formats used in DVD technology
DVD-ROM
It stores general data, and video and audio information for multimedia applications and computer requiredGames.
DVD
One of the reasons for the success of DVD technology is the DVD-Video format. The DVD-Video application is heavily dependent on data compression, since the bit rate of 167Mbps, the 4 GB storage capacity of a standard DVD would be enough to approximately 4 minutes digital video library. This provides the nominal 133 minutes playing time for DVD-5.
The DVD-9, the dual-layer-use technology that is ideal for longer movies. In this case, the data starts on the first layer onthe inside of the disc and end on the outside. The data on the second layer on the outside begins and ends on the inside thus provides continuous playback.
Tags: Formats, Technology
