Formats for digital video tape recorders

The characteristics required for a studio format digital recorder are considered and variable-speed operation for the Type B and C systems is described. The implication of the picture-in-shuttle techniques are considered and also the reasons for adopting a helical rather than transverse format. Coding systems are then compared in some detail with special reference to error detection and correction and it is concluded that the Miller Squared code is superior to the 8/10 code. Brief comment is made on the adoption of a broadcast digital standard.