Disc Recorders for Video Storage-An Analog to Digital Evolution

Magnetic disc recorders are in widespread use as storage devices for information in both digital and analog formats. Disc recorders used for storage of video information have been predominately analog machines; however, a new system to store and retrieve video graphics used in television broadcasting utilizes digital signal processing techniques and digital recording on computer disc drives. This paper provides a description of this digital system and a brief review of current analog video disc machines.