Five formats of DVD technology
Consumers of music in a new era in 1980 when it was introduced in the digital medium of the CD. On the film was the consumer at home for VHS, that is glued Video Home System, Volume until 1980. This was also non-digital, but gradually replaced by CDs, the digital VHS in late 1980.
Film companies were not happy with the CDs that were available and worked for various digital video formats into a product that would be better to develop visual and auditorySite quality for consumers. The result was the development of the DVD. DVD technology in the early 1990s and was immediately entertainment such as Time Warner and Sony understood and agreed to promote the new technology of high quality.
DVD stands for Digital Versatile Disc, although it is known as digital video disc because of the popularity in video. The main reason for the popularity and growth of the DVD is that DVD technology allows the storage oflarge amounts of data using digital technology.
At the moment, DVD provides over 480 lines of resolution, which is two times larger than 20 lines of VHS. The 480 lines at best, a progressive DVD player to see the 40 to convert interlaced video into a 480 line progressive format. The display has a 31.5 kHz or higher speed progressive scanning. This means that all traces of the scan delay accounts and offers a TV screen.
DVD technology is very different from the CD, even ifvery similar. A DVD consists of a thin circular wafer of plastic and metal measuring 4.75 "in diameter, with a small hole in the middle. The thickness is 0.2 inches, and two of these disks are compressed into a disc double-sided 0.04 inch thick.
The digital data, resulting in the binary language of ones and zeros, is on a CD master and the master disk is encrypted so used to establish autonomous copies. The agreement is to burn small holes than doneMines in a microscopic layer of metal, usually aluminum, with the help of a laser. These mines are the tracks themselves. Binary zeros are the smooth surface of layers of metal that was not hit by binary zeros in metal. So metal is coated with a transparent protective layer.
Five physical formats used in DVD technology
DVD-ROM
Retains general data, and video and audio for multimedia applications and computer useGames.
DVD
One reason for the success of DVD technology, DVD-Video. DVD-Video application is heavily dependent on data compression, since the bit rate of 167Mbps, 4 GB of storage capacity on a standard DVD would be enough for about 4 minutes of video digital library. This gives the nominal 133 minutes playing time for DVD-5.
DVD-9, dual-layer-use technology that is ideal for movies longer. In this case, the data of the beginning of the first layer ofthe inner side of the disc and ends on the outside. The data on the second layer on the outside begins and ends on the inside thus provides for the continuous reproduction.
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