A comparative analysis of HD-DVD

Posted on January 10, 2010
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VHS

The advent of VHS (Video Home System) in 1976 marked the emergence of this region of the world. The videotape was a household name, and is the preferred medium for home entertainment in the '70s, '80s and early '90s. VHS was able to store audio and video data formats. It offers a resolution of 240-line quality. VHS tape has been able to reproduce all analog TV signals in his time. The signs are currently in use are NTSC, PAL, PAL-M, SECAM notand MESECAM. Video recorders were able to manage alone, which characterize the country in which they were sold by the speed of the tape, the maximum time to play at 430 million bond is about 3.5 hours for NTSC and PAL for five hours in SP (standard play). This is one of the poorest quality video formats. Due to the size of video tapes, consequently, the camera recording VHS was also a big and clumsy. There was a limit to the amount of data that can be saved.

VHS-C or a VHS-Compactwas designed tape 8 millimeters in size. Although it is the same half-inch magnetic tape, and 240 lines of resolution, allowed the camera to be lighter, smaller and more convenient. This tape 8 millimeters are not compatible with standard video recorders, and can not be played directly on them.

To improve the system VHS, S-VHS is designed as a better standard analog, followed by D-VHS recordings, digital-quality video on a VHS tape. W-VHS is designed to provide a highdefinition video. Even with all the progress, the quality of video and audio much to ask.

Newbie

In line with consumer demand for high-quality home entertainment systems, Compact Disc (CD) defined by Sony and Philips in 1988. The VCD (Video Compact Disc), formed in 1993 launched by Masushita, Sony, Philips and JVC. Using MPEG-1 compression technology, has been able to maintain a 74-minute VHS video quality and CD quality audio. Thenbetter quality SVCD (Super Video Compact Disc) was introduced, which uses MPEG-2 compression format, but his playing time had dropped to 35 minutes. The VCD has not been a great success in the United States and European countries because of their susceptibility to easy copying and illegal distribution. This format is not supported by the entertainment industry Hollywood for the same reason. These VCDs were also limited in their compatibility with the type of player who can playback. Moreover, long after the movie must be registered by two or three VCDs for a single film.

DVD and HD-DVD

All the previous technique was to achieve any progress in home entertainment, but the quality of audio and video can be obtained far from the true cinematic experience. Furthermore, the data storage is far from sufficient. This difference is the arrival of a DVD (Digital Video Disc) throughout the year 1997. This technology is aan immediate success, because it can provide a much higher quality and sound quality of VHS and can process information much faster than a VCD. The distribution of a DVD with different intervals in different countries can be realized by using the region coding on DVDs and DVD players. The latest versions of DVD players are multi-region need to let him play the whole region DVD. DVD players are likely to play any standard TVas NTSC, PAL or SECAM. The latest models of DVD players are compatible with a wide range of media play as the CD-R, CD-RW, DVD-R, DVD-RW, MP3, DivX and WMA, among others.

HD-DVD (High Definition DVD) is formulated in 2003 as a high capacity optical disc, and enhanced functionality. Even though DVD and HD DVD are similar in structure, size and shape, there are many technical differences between thetwo. The DVD has a capacity of 4.6GB of data and can store two hours after the resolution of 525-line standard definition video. In comparison, the HD-DVD data storage capacity of 15 GB on a single layer disc can store a two-hour movie in HD format with space for more information bonus room for savings. The 30 GB dual layer HD-DVD is able to save an eight-hour, 1125-line images of HD, SD or 48 hourspicture. The three proposals-layer HD DVDs have a capacity of 45 GB of storage.

The DVD is read using a 650nm red laser, while HD DVD is read using a 405nm blue laser. The smaller wavelength allows data to be read by a greater density of the disk surface and cause less diffraction. This ability to store data with a higher density HD-DVD has more storage capacity. The optical pick-up head has a numerical aperture of0.65 in the case of HD DVD, compared to 0.6 of a DVD. This similarity ensures compatibility for both technologies. Compression techniques are similar for the two, MPEG-2, Video codec1 for DVD and MPEG-4 AVC and VC-1 for HD DVD. However, MPEG-2 only one third of compression possible with MPEG – 4 The quality of the display is higher than the MPEG-4 compression techniques.

A unique feature will be in HD DVDthe built-in restrictions on copying or content protection technology AACS LA, the (Advanced Access Content System Licensing Administrator) has been developed. Includes an audio "-water-system of trademark protection in which a waveform changes in a way that serves as a code that can be recognized by a DVD player. It helps the reader to distinguish between an original CD and a copy. The copy will be the player to discover discarded. It is one means of communication available in the pasthad a security feature content.

HD-DVDs have a price slightly higher than that of DVD players, Toshiba HD-DVD, which ranges from $ 500 to $ 800 while Samsung HD-DVDs have a price around $ 140 to $ 250 range with the options. Since the technology is widespread and readily available, prices will automatically fall with the increase in consumer pricesquestions.

In a trace of nuts, HD-DVD and audio visual technology of the most successful ever made. With its compatibility with existing DVD technology and unsurpassed quality and accessibility, which certainly will not be the market leader in home entertainment.

DVD players and recorders, including DVD players multi-region and recorders can be purchased at http://www.planetomni.com inCalifornia. They ship all over the world.

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