Laserdisc and the LV-ROM playerBefore DVD was born, Laserdisc was the best available home theater video and audio source available for home consumers. It offered broadcast quality video and audio on LP-sized 30cm discs. Although the system is (unfortunately) obsolete, some enthousiasts claim that the picture quality of the Laserdisc system is still superior to DVD video quality. Just before the system died, even Dolby Digital and DTS were available.
Laserdisc was the predecessor format of DVD. All the 'data' was stored on 1 or 2 double-sided 30cm discs. Although the video signal is stored in analog, the picture quality is much higher than most modern DVD's since no compression is done on the video signal. The audio can be stored as analog or digital signal. Later, AC-3 (better known as Dolby Digital) and DTS were incorporated in the system.
The signals could be either stored in CAV (Constant Angular Velocity) or CLV (Constant Lineair Velocity). CAV offered more special features (such as slow motion, fast forward). CLV discs could contain more information. Most movies are stored in the CLV format since it is way more space efficient.
Although a success in the United States, it never broke through in Europe. Simply because the discs themselves were very expensive.
The LV-ROM player is a special player which was specially build for the British Domesday project. Instead of a digital audio, this space was used to store data. LV-ROM players have a SCSI interface and can be used as a normal SCSI device. More information on the Domesday project can be found at: www.beebmaster.co.uk/Domesday/DomesdayHome.html