VHS

The arrival of VHS (Video Home System) in 1976 marked the birth of this sector in the world. The video has become a house hold name and was the preferred medium for home entertainment in the '70s, '80s and early '90s. The VHS was capable of storing audio and video. It provides a resolution of 240 quality online. The VHS was able to read all the analog TV signals of its time. Signals in use at the time were NTSC, PAL, PAL-M, SECAM,and MESECAM. The VCRs were able to handle only signals specific to the country they were sold in. Based on the tape speeds, the maximum play time for a 430m tape is about 3.5 hours for NTSC and five hours for PAL at SP (standard) quality. This is one of the poorest quality video formats. Due to the size of the video cassette, correspondingly the VHS recording camera was also big and cumbersome. There was a limitation on the size of the data that could be stored.

The VHS-C or VHS-Compact was designed with a size of 8 mm tape. Although the medium itself magnetic stripe and 240 inches of online payment, allowed for the camera to be lighter, smaller and more convenient. The tape 8 millimeters is not compatible with video recorders and can be read directly on them.

To improve the system VHS, S-VHS was designed as a better standard analog, followed by D-VHS that records video in digital quality on a VHS tape. The W-DVD is designed to produce highdefinition video. Even with all these advances, the quality of audio and video has had a little 'to be desired.

VCD

According to consumer demand entertainment system at home premium, the compact disc (CD) was formulated in 1988 by Sony and Philips. The VCD (Video Compact Disc), the format was launched in 1993 by Masushita, Sony, Philips and JVC. Using the MPEG-1 compression technology, was able to hold a 74 minutes of VHS-quality video and CD quality sound. Thenbetter quality SVCD (Super Video Compact Disc) was introduced, which used the MPEG-2, but his playing time was reduced to 35 minutes. The VCD has not had much success in the United States and European countries because of their sensitivity to fast copying and illegal distribution. This format has not had the support of the entertainment industry in Hollywood for the same reason. These VCDs were also limited in their compatibility with the type of players that could be played.Moreover, the film should be recorded with two or three VCDs for a single movie.

DVD and HD DVD

All previous technologies have been able to achieve some progress in terms of entertainment, but the quality of audio and video are far from practical experience real movie. Moreover, data retention is far from sufficient. This vacuum was filled with the arrival of DVD (Digital Video Disc) for the year 1997. This technology was an immediate success because it was ablegive a much higher quality picture and sound quality of DVD and can process information much faster than a VCD. The distribution of DVDs in different times in different countries could be obtained using region coding on DVDs and DVD players. Later versions of DVD players are multi region can afford to play all regions DVD. The DVD player is designed to play exactly like the TV standard PAL, NTSC and SECAM. Recent models of DVD players are compatible with variety of playback of media such as CD-R, CD-RW, DVD-R, DVD-RW, MP3, DivX and WMA, among others.

HD DVD (High Definition DVD) was developed in 2003 a large capacity and advanced features of the optic disc. Although the DVD and HD DVD are similar in structure, size and shape, there are many technical differences between the two. The DVD has a storage capacity of 4.6GB and can store two hours of 525 lines of resolution standard definition video. Comparatively> HD DVD has a storage capacity of 15 GB of data in a single layer disc can store one-two movies now in HD format with space above for information about the awards and even a little 'space to sell. The 30 GB dual-layer HD DVD can hold eight hours, 1125 lines in the HD, or 48 hours of SD images. The proposed triple-layer HD DVD would have a capacity of 45 GB of storage.

The DVD is read using a 650nm red laser, while HD DVD is read405nm using a blue laser. The smaller wavelength allows data to be read by a greater density of the surface of the disk and creates less diffraction. This ability to store data at densities higher than HD DVD offers its large storage capacity. The optical pick-up head has a numerical aperture of 0.65 in the case of HD DVD compared to DVD 0.6. This similarity allows backward compatibility for both technologies. Compression techniques are similar for both;MPEG-2 Video codec1 for DVD and MPEG-4 AVC and VC 1 for HD DVD. However, MPEG-2 can provide one third of compression possible with MPEG-4. The quality of reproduction is also more than with MPEG-4 compression technology.

A unique feature is its HD DVD high-copy restriction technology or content protection, which was developed by AACS LA (Advanced Access Content System License Administrator). It includes an "Audio Watermark Protection"system that has a waveform changed so that it acts as a code which is recognizable by a DVD player. This helps the reader to the difference between an original and one copy on paper. The copy will be rejected by the player after being detected. None of the media previously available had all the characteristics of content protection.

HD DVD has a price slightly higher than that of the DVD, Toshiba HD DVD ranging from $ 500$ 800. While the Samsung HD DVD players are priced around $ 140 to $ 250 or less with the functionality provided. As technology becomes more widespread and readily available, prices will automatically decrease with the increase in consumer demand.

In short, the HD DVD discs and players are the most successful audio visual technology can be created. Thanks to its compatibility with existing DVD technology and accessibility of quality and functionality, will certainlythe market leader in the entertainment industry.

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