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A section on an iconoscope film camera in Fink's "Television Engineering" (1952) says (describing the control amplifier):
"The second video stage also feeds a rectifier which develops a bias at the black level. This bias is added to the bias fof the follower [sic] clipper stage, so that the clipper always limits at the black level. The black level control is disabled during the blanking intervals..."
This seems to correspond to setting the darkest part of the image to black.
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Old TV literature, New York World's Fair, and other miscellany
Last edited by old_tv_nut; 02-10-2020 at 05:50 PM.
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