A and E Controlrooms are similar in facilities. The switchers
are 12 input, preset cutbar flip-flopoverlap relay type. There
is a lap dissolve and an effects function between the preset
and program buses that require no presetting. In addition, two
effects buses are available with a full range of special effects
including chroma key. These switchers are slated for replacement
in the near future.
B and D have custom built TS-40 switchers that functionally
are an extension of the relay type switchers. They are 18 input,
preset cutbar flip-flop solid state vertical interval switchers.
Each input has a relay so that an "A" or a "B"
input may be selected so that 36 video sources may be switched.
They have the lap dissolve and effects functions between the
preset and program buses as the older switchers, also the effects
buses and chroma key. There is a mixer just prior to the studio
output that is designated as "Supermix". This mixer
allows video such as a digital clock to be inserted in the picture
without tying up anyof the normal switcher facilities. The mixer
is fed from a bus which is designated "Key-Supermix-Emergency."
The key function is used as an external key to the effects unit.
emergency feature allows cameras to be switched in event of
a malfunction of the main switching bus. It may also be used
as a bypass of the main switching to allow for rehearsal during
controlrooms are provided with reel and cartridge tape recorders,
and A, E and D Studios also have turntables available.