Video white signal compression and peaking

Television – Image signal processing circuitry specific to television – Transition or edge sharpeners

Patent

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Details

348690, H04N 520, H04N 514

Patent

active

052990001

ABSTRACT:
A video white compression and peaking arrangement comprises a plurality of inverting amplifier transistors each tied to a common threshold level. RGB input video signals are applied to the inverting amplifier transistors which are ineffective for signals below the threshold level. The transistors are progressively turned on for input signals that exceed the threshold level resulting in non-linear negative feedback signals that compress the output signals by subtraction. A tuned circuit is coupled across the input of each inverting amplifier transistor for bypassing selected frequencies from the negative feedback effect and relatively peaking those frequencies in the output signal.

REFERENCES:
patent: 3560645 (1971-02-01), Wallace
patent: 4214272 (1980-07-01), Hapgood
patent: 4399460 (1983-08-01), Harwood
patent: 4437123 (1984-03-01), Harlan
patent: 4513320 (1985-04-01), Reneau

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