|
Electronic Video Recording
|
Electronic Video Recording, or EVR, was a film-based video recording format developed in the 1960's by CBS Laboratories.
CBS announced EVR in October 1967. The 750-foot film was stored on a seven-inch diameter spool in a plastic cartridge. It used a twin-track 8.75mm film onto which video signals were transferred by electron beam recording, one monochrome track in each direction of travel.
Some EVR films had a separate chroma track in place of the opposite-direction monochrome track for color EVR films. The images stored on an EVR film were visible frames much like motion picture film, and were read by a flying spot scanner inside an EVR player to be converted to a video signal to be sent to a television set.
EVR was also released by CBS as a professional version for television broadcasting, called BEVR (Broadcast EVR). As a professional medium, the format offered extremely high quality. It was, however, quickly superseded by professional and consumer magnetic tape formats.
External links
|
