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What is DVD DVD stands for Digital Versatile Disc However it is most commonly referred to as Digital Video Disc DVD is the first video distribution medium designed for digital video DVD is an exciting new technology because of the following benefits h up to nine hours of studio-quality video and multiple channel surround sound h simultaneous multiple language support and interactivity h parent control h multiple camera angles h compact shipping and storage h other digital video delivery systems including direct broadcast satellite wireless cable and digital cable h computer friendly h copy protection h multiple aspect ratios Digital video changes all aspects of video production Up to this point video has been recorded and transmitted as analog electrical system Analog video transmitters and receivers can be built inexpensively but are very expensive to transmit and store Also todays strong digital computers cannot process analog signals so analog information cannot be easily searched sorted or edited The change of video from the analog to the digital domain changes everything Digital video can be stored and distributed more inexpensively than analog and digital video can be stored on randomly accessible media such as a magnetic disk drive hard discs and optical disc media CDs When stored on randomly accessible media video can be used in other applications such as games education training and other applications Even movies can become interactive allowing viewers to select their point of view a plot path and the ending Digital video also significantly increases transmission efficiency so that communications networks everything from television systems to telecommunication satellites are able to carry from six to ten times more channels of video programming than was possible before thereby offering more consumer choice The ability to transmit video over the public phone network will also allow video conferencing accelerating the work at home movement that is changing the way people are employed DVDs can hold 47 to 17 billion
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