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1950 TELEVISION STUDIO SYSTEM 481
trolled from each director's console by means of a push-button panel containing sixty momentary contact push buttons. These control circuits operate video switching relays located centrally in the Camera Control Center for all studios.
Each of the three studio camera switching systems consists of a relay bank of twelve inputs with five outgoing channels. This permits the handling of up to eight local camera signals and three remote composite signals through any studio control room. In addition, the twelfth input to the switching system is used as an "Effects" input for switching in a super-position, lap dissolve or other type of effect, as required. The five outgoing channels feed the two preview monitors in the director's console, the effects mixer amplifier, and the main program output of that studio.
The space above the program control rooms on the second floor contains the Film Projection Room and the combination Camera Control Center and Master Control Room (Fig. IB) . In the Camera Control Center all of the camera control units are located together in a large U-shaped console, In addition, forty equipment racks house the associated amplifiers, power supplies, synchronizing generators and the power supplies for all the studios.
In the camera control section, eight studio camera controls, each with its picture monitor and oscilloscope and two line monitors form the section facing the studios. A special feature of the Camera Control Center is the camera cable patch panel shown on the right side in Fig. 3. This is mounted on the wall directly adjacent to the camera control units themselves. The sockets mounted on these panels correspond to cables leading to the various studios. The camera cable pigtails that plug into these sockets correspond to the eight studio camera control units. Thus, the eight camera controls can be distributed in any combination among the fifteen circuits to the various studios depending upon program requirements. This adds greatly to the flexibility of the over-all system and makes it possible to take care of almost any special requirement. Furthermore it reduces the total number of camera chains required in such an aggregate of studios.
It is thus that, in case of trouble with the equipment during a program or rehearsal, it is very easy to patch in a spare camera control unit so that the equipment giving trouble may be released for maintenance.
In addition to the patching of the camera control units to any of the studios on the camera cable patch panel, it is, of course, necessary to patch the video outputs of the camera controls on the coaxial jack panels which are mounted in racks adjacent to the program control