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CD and DVD Technologies. James Lehman EDCI 663 Purdue University. CD-DA. The digital audio CD (CD-DA) was developed by Sony and Philips following development of the laser videodisc. The standard was defined in 1982 as the “Red Book” standard. It was an immediate consumer success. CD-DA.
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CD and DVDTechnologies James Lehman EDCI 663 Purdue University
CD-DA • The digital audio CD (CD-DA) was developed by Sony and Philips following development of the laser videodisc. • The standard was defined in 1982 as the “Red Book” standard. • It was an immediate consumer success.
CD-DA • CDs are 12 cm (4.72 in) in diameter (compared to 12 inches for videodiscs). • Audio CDs hold up to 72 minutes of 16 bit audio sampled at 44.1 KHz.
CD-ROM • Sony and Philips developed the CD-ROM as an offshoot of the audio CD. • The original standard was defined in 1983-84 with the release of the “Yellow Book” standards. • CD-ROM XA extended the standard format, interleaving audio and video, to better support multimedia.
CD-ROM • CD-ROMs hold up to 650 MB of data. • Error correction limits errors to 1 in 10 trillion. • Because they were designed as a mass storage medium for computers, CD-ROMs made for one computer platform often do not work on a different platform.
CD-ROM • The original standards did not take into account the file system. High Sierra was the first effort to standardize file formats. It uses mainly the old MS-DOS format. • HFS supports Apple file names, Rock Ridge supports UNIX, Joliet supports Windows long file names.
Recordable CD-ROMs • Recordable CD formats were defined by the “Orange Book” standards. • Today, CD-R and CD-RW drives are commonplace, and media costs have declined sharply.
Other CD Formats • CD Extra (Blue Book) – Audio CD with visual add-ons. • CD-I (Green Book) – now defunct multimedia CD format • Photo CD – Kodak’s format for storing photos on CD • Video CD (White Book) – Old video CD format that supports 74 minutes of MPEG-1 video on a CD
DVD • Proposed by a consortium in 1995, DVD originally stood for “Digital Video Disc” then “Digital Versatile Disk.” Now, it’s just DVD. • DVD-Video and DVD-ROM standards were released in 1996. DVD-audio was defined in 1999.
DVD • Consumer products first appeared in 1997. While slow to catch on at first, DVD is now the most successful consumer electronics innovation in history. • There are now over 55 million DVD-video players in the U.S., and over 100 million DVD-ROM drives are installed worldwide.
DVD-Video • A standard (DVD-5) DVD-Video disk holds 133 minutes of video encoded in MPEG-2 format. • Like videodiscs, DVD-Video supports multiples languages, still frames, searching, etc. • Though little used, the DVD-Video format is capable of supporting a multiple camera angle feature.
DVD-ROM • DVD-ROM is the larger cousin of CD-ROM. One can hold 4.7 GB of data. • Recordable DVD formats are still not standardized. However, recorders and players are now available that support most of the competing formats.
DVD-Audio • DVD-Audio supports high-quality surround sound (5.1 channel) audio at sampling rates of 44.1 KHz to 96 KHz and with greater frequency range than on CD-DA disks. • Extras such as images and notes can also be included. • DVD-Audio products are now beginning to appear.
Next Generation • Two competing formats are now vying to be the next generation DVD: • Blu-Ray from Sony • HD-DVD from Toshiba • Blu-Ray has a larger storage capacity (25 GB vs 15 GB), but HD-DVD promises to be less expensive. • The marketplace will determine the preferred format.
