Digital Versatile Disk (DVD)
Digital Versatile Disk (DVD) – The modern proposals for DVD are the result of two former optical disc formats, supporting the MMCD (Multimedia CD) and the SD (Super Density) formats. The two groups agreed on a third format. The DVD, initially, addressed only movie player applications, but today’s DVD is positioned as a high-capacity multimedia storage medium. The DVD consortium addresses topics such as video, ROM, audio-only, and copy protection. The movie player remains the DVD’s prime application, but the DVD is taking an increasingly large share of the CD-ROM market. The promoters of the format agreed in December 1995 on a core set of specifications. The system operates at an average data rate of 4.69 Mbit/s and features 4.7 GB data capacity, which allows MPEG-2 coding of movies, or which may be utilized for a high-resolution music disc. For the PAL and NTSC specifications of the DVD, different audio coding has been chosen to obey market patterns. For the NTSC version, the Dolby AC-3 coding will be mandatory, with MPEG audio as an option, whereas the opposite is true for PAL and SECAM markets.
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