Television – Image signal processing circuitry specific to television – Special effects
Patent
1993-11-19
1994-11-01
Groody, James J.
Television
Image signal processing circuitry specific to television
Special effects
348598, 348588, 348586, 348584, 348673, 348679, 348682, 348689, 348692, 348694, 348683, 348904, H04N 976, H04N 974, H04N 557, H04N 5265
Patent
active
053611012
ABSTRACT:
An RGB preamplifier for a video display includes respective multipliers independently operable for adjusting the contrast of input primary and secondary video signals. The contrast adjusted video signals are added to form a combined display signal, the combined signal being applied to the first inputs of primary and secondary comparators each of which is also supplied with a respective reference DC level. The primary and secondary video signals are alternately nulled at horizontal line rate by nulling the corresponding multipliers. The primary comparator samples the combined signal when the secondary signal is nulled for clamping the DC level of the primary signal in relation to the primary reference DC level and the secondary comparator samples the combined signal when the primary signal is nulled for clamping the DC level of the secondary signal in relation to the secondary reference DC level.
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Groody James J.
Metjahic Safet
Zenith Electronics Corporation
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