scope:

This standard applies to pre-recorded optical reflective videodisks compatible with 50 Hz/625 lines CCIR monochrome and colour coding PAL systems, and defines those parameters that effect the interchangeability of the disks, excluding limitations of the programming material and source. This standard does not contain a specification for a push-pull radial differential signal. For future applications of the video disk, it is desirable to specify this signal and to add this specification to the current standard.