a. The coring amplifier strips out the noise by attenuating the low
amplitude signals which contain the fine details of the picture. The output
of the coring amplifier is applied to an aperture corrector, which boosts
the higher frequency portions of the signal.
This high-frequency boost
compensates for the losses that occur in the pickup tube and lens.
b. From the contour separator, the contours signal is added back into
all three video channels on the video II boards (A7, A8, A9). This process
restores the green signal to its full bandwidth with an aperture boost. The
process also effectively increases the bandwidth of the red and blue
channels.
c. Following the addition of contours, a master pedestal signal is
added to the video, and it is blanked with composite blanking before being
sent to the gamma board.
d. On the gamma module (A30), all of the signals are white clipped and
applied to a diode shaping network; this results in a gamma-corrected signal
with a gamma of approximately 0.35. The gamma controls allow for continuous
adjustment range from 1.0 to 0.35.
e. The gamma-corrected signals are then applied to the line driver
board (A6), where the power amplifiers convert them to standard level 75 ohm
signals.
These are fed to the view finder processor board (A5), the
waveform monitor driver board (A4), the encoder section, and the camera
control unit back panel red, blue and green outputs.
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