CC I R TV pattern generator (1)

The basis of any television signal is a complex synchronisation wave- form, which ensures that the scanning circuits of the TV receiver stay synchronised to the transmitted signal. Standards vary throughout the world, but in Europe the CCIR norm is used, and the basis of this design is a generator to provide a CC I R standard sync. signal. Of course, such a sync. signal is of very little use by itself, so the modular construction of the generator allows the addition of units to generate various video signals, the first of which is a test pattern generator giving a fully interlaced picture.