Information AboutClv |
| CATEGORIES ABOUT CONSTANT LINEAR VELOCITY | |
| rotating disc computer storage media | |
| audio storage | |
| video storage | |
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With a CD, the motor speed decreases from 495 to 212 rpm as the read head moves away from the center, to keep the disc moving past the read head at a constant linear velocity (CLV) of 1.2 m/s. A DVD has as many as 24 zones of different linear velocity. This zoning has given rise to the notion of Zoned Constant Linear Velocity ( ZCLV ). Constant Linear Velocity Timeline ('''CLV''') The CLV technique is applied to CD-R drives with a greater than 16X spin speed. Older 16X (and slower) CD-R drives had a constant rate of spin speed. Constant Angular Acceleration ('''CAA''') is a variant of CLV that was used on the Laserdisc format. The intial specification of CLV (as it applied the laserdisc) resulted in several playback artifacts to be present in the audio/video portion as well as compatibility problems with laserdisc players as produced by different manufacturers. In the mid 1980's, Pioneer electronics, introduced the CAA scheme where the speed in rotation of the laserdisc was lowered in steps and eliminated most playback artifacts and compatibility issues. Since its introduction, most all manufacturers of laserdisc discs adopted the CAA format but stilled referred their CAA-encoded product as CLV. |
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