Clv Refferences

Definition of CLV

is a CD-ROM (Compact Disc - Read Only Memory) format in which the spacing of data is consistent on the CD, but the speed of the disc varies on whether the data being read is near the cent or the edge of the disc."

How it function.

During CLV, in order to create the effect of constant speed as the CD turns, the CD drive uses a mechanism that slows down the disc when the laser beam is near the center of the disc, and speeds up the disc when the laser beam is near the outer edge. Thus, the beam is over a sector for the same amount of time, no matter where the sector is.

CLV means that the laser beam is reading data along the spiral track at a constant speed (11 meters per second for laserdisc, 1.2 meters per second for compact disc). As the track spirals from the center of the laserdisc to the outside edge, the rotation speed has to slow down from 1800rpm to 600rpm (500rpm to 200rpm for compact disc), in order to maintain this constant linear velocity of reading the data (the circumference of the outer edge is greater than it is at the center).

Advantages of CLV

* CD-ROM data transfer rate can be maintained at a constant state, thus ensuring internal and external optical drive to read data along to same

* only the higher quality players can do these things on a CLV disc.

* Most laserdisc movies are produced in the CLV format, because it allows 1 hour of movie to be stored on each side of the 12 inch disc (unlike CDs, the LD has information on both sides).

* Compact Discs are fundamentally in the CLV format, and because there are only two digital sound tracks on them, compared to one video and four audio tracks for a laserdisc,

E.g a compact disc can fit about 1 hour of music on a 5 inch disc.

* The rotation speed, in the inside, of a disc at 16x recording speed reaches up to 8000rpm per minute.

Disadvantages

* The high rotation can cause the problem to the mechanism and produce loud noise.

* As the line speed...