CAV (Constant Angular Velocity)

(n.) = velocidad angular constante (VAC)
Ex: High recording density is also aided by rotating the disc at a constant linear velocity (CLV) with respect to the laser beam, rather than at a constant angular velocity (CAV), as is done with conventional audio discs and some video disc systems.

Refers to analog video laser disks which rotate at a constant speed  (1800 RPM) to play the program, where about 30 minutes of program fit on a side, and where the ability to do slow motion or single frames is easily accomplished and can be done by any player. One revolution corresponds to one video frame. If you examine the disk surface, you can see a bow tie texture pattern that represents the two interlaced fields and the vertical retrace intervals. There are some cheap tape recorders (Mini-cassette and 3 inch open reel styles) which use  the CAV idea, using the take up spool only to pull the tape. As the recording or playback progresses, the tape speed past the heads increases due to the build-up of tape on the take up spool.