30 September 1988
Overall video signal
It is very important that all video signals arrive at the switcher in
synchronization. This means that the scanning sequence of each source must
start and stay in time; otherwise, the picture on the receiver or monitor
will roll, jump, tear, and/or have color shift problems when the source
signals are combined.
In all television studio facilities, a timing
reference is provided by the use of a sync generator (fig 1-6).