8

Digital video production

Swi4tching and combining video signals

A television programme consists of a sequence of different images, as the ‘eye’ of the camera flicks (cuts) from viewpoint to viewpoint. Stylistically this production technique originated in film, where sections of film (shots or sequences) are joined together – literally – with glue. In television this effect is achieved electronically by switching between the output from one camera and that of another. For this to be accomplished successfully, the switch must occur during the vertical interval; this is directly analogous with the mechanical joining of film, which must be executed at a frame boundary for the cut to be invisible. This sounds innocuous enough, but it actually ...

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