24-09-2012, 12:24 PM
Camera Control Unit (CCU)
Camera Control Unit(1).docx (Size: 11.84 KB / Downloads: 26)
Abstract
The television cameras which include camera head with its optical focusing lens, pan and tilt head, video signal pre-amplifier view finder and other associated electronic circuitry are mounted on cameras trolleys and operate inside the studios. The output of cameras is pre-amplified in the headand then connected to the camera control unit (CCU) through long multi-core cable (35 to 40 cores), or triax cable.
All the camera control voltages are fed from the CCU to the camera head over the multi-core camera cable. The view-finder signal is also sent over the camera cable to the camera head view-finder for helping the cameraman in proper focusing, adjusting and composing the shots. The video signal so obtained is amplified, H.F. corrected, equalized for cable delays, D.C. clamped, horizontal, and vertical blanking pulses are added to it. The peak white level is also clipped to avoid overloading of the following stages and avoiding over modulation in the transmitter. The composite sync signals are then added and these video signals are fed to a distribution amplifier, which normally gives multiple outputs for monitoring etc.