Digitization of video signals

2.1   Why digitize video signals?

For a number of years, video professionals at television studios have been using various digital formats, such as D1 (components) and D2 (composite), for recording and editing video signals. In order to ease the interoperability of equipment and international programme exchange, the former CCIR (Comité Consultatif International des Radiocommuncations; Note 2.1) has standardized conditions of digitization (recommendation CCIR-601) and interfacing (recommendation CCIR-656) of digital video signals in component form (Y, Cr, Cb in 4:2:2 format).

The main advantages of these digital formats are that they allow multiple copies to be made without any degradation in quality, and ...

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