06-11-2016, 07:54 PM
(06-11-2016, 07:25 PM)ppppenguin Wrote: I agree that pedestal is the technically correct name for the difference between black and blanking levels. I have often heard it colloquially called lift and thought you meant pedestal. I'm not sure where lift was manually controlled in the M-EMI programme chain though it must have been individually controlled for each camera by the racks operator.
I would be very surprised indeed if anyone with any meaningful experience in broadcast television used the word "lift" when "pedestal" was intended, or vice versa. They are quite different things. The pedestal applied to the broadcast signal is sometimes seen referred to as the "set-up", though this tends to be by our colleagues with 525 lines in their signals.
Lift was not controlled on the cameras individually in the M-EMI system. There was a master lift control very late in the signal chain. The racks operators (who were actually engineers, and sat at the racks i.e. bays of equipment in the Apparatus Room) controlled tilt, bend and gain. Lift was done by another engineer - and all this is in Birkenshaw.
This might be the clue as to why the vision mixer couldn't cut. The resulting instantaneous change in lift would be impossible to correct for.
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John Ruskin
