What do dvd mean

The DVD works in the same way, except that both the discs are double-sided. Instead of just reading one side for information, the laser reads both sides, something like our old vinyl records. If you're in the movie rental business that means more long-term profits as you won't have to pay for replacement versions after multiple plays.

It has the added advantage that the local franchise won't have to worry about whether you rewind it or not. In addition, because of special features within the television set DVD player units, it will be impossible for these sets to "read" and play pirated copies of movies on DVD, a problem that has plagued Hollywood's video market abroad.

This micrograph shows a commercial die, into which CD manufacturers inject molten polycarbonate plastic to form the pits and lands of an individual disc. DVD digital video disc is a technology based on optical data storage similar to compact disc CD. Optical data storage is a method of storing digital information 1's and 0's by using light to read the information. Analog information is converted into digital information, which is then encoded onto the disc from the inside edge out.

Digital data are encoded by means of pits on the recording layer of the disc. The pits and the separations between pits, called lands, vary in length to represent the digital information stored in the disc.

The pits are arranged in a track that forms a spiral pattern on the recording layer of the disc. The disc revolves in a circular motion inside the player, while an optical head laser slowly moves outward and remains focused on the pits.

The laser beam is reflected back to a detector when it hits the lands, and it is scattered away from the detector by the pits. The transition between a pit and a land corresponds to a "1" in the digital bit stream. A DVD can store over two hours of video on one layer of the disc. In comparison to the 74 minutes of data that a CD can hold, this capacity marks a vast improvement.

The smallest pits on a DVD are about 0. The pits are arranged in tracks called track pitch that are spaced much closer on a DVD 0. With this construction, a single layer, single-sided DVD can hold 4. Pits burned into a recordable CD-ROM, shown in the scanning electron micrograph above, are rougher around the edges than pits in a commercially stamped CD.

With such small pit areas, the number of possible errors in reading the disc is limitless. As a result, error correction storage has seen rapid development.

In CD technology, there is error correction coding ECC on the disc as a means of correcting problems when they occur. The ECC algorithms are configured to detect and perfectly correct errors in the data. This same method is used for error correction in DVD technology.

The greater amount of information stored on a DVD video is chiefly due to the smaller pit size and tighter track spacing, but another factor comes into play--namely, compression. This development is based on temporal compression that compares each frame of video to the following frame and only stores the changes in the scene. It stores a single frame in a delay so as to continually put out the background of a scene and have more room to store the changes in the scene.

MPEG2 also uses the discrete cosine transform, which takes images and finds their frequency and then compresses any repetitive frequencies. Formatting Information For an Operation. First In, First Out.

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It'll exist as a DVD , as a streaming release, and so on. All of that will likely include the mention of An Oscar. When you put people in a theater or they watch a blue ray DVD , they are watching in the comfort of their home, but to physically be inside a tram car and experience your favorite franchise as a theme park ride, it definitely raises the bar.

The DVD audience is a little older. We're doing our best to make sure our content is useful, accurate and safe. If by any chance you spot an inappropriate comment while navigating through our website please use this form to let us know, and we'll take care of it shortly. Forgot your password? Retrieve it. If by any chance you spot an inappropriate image within your search results please use this form to let us know, and we'll take care of it shortly.

Term » Definition. Word in Definition. Princeton's WordNet 5. Wiktionary 2. Freebase 2. Suggested Resources 0. Matched Categories Optical Disk. How to pronounce DVD? Alex US English. David US English.