Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1992-06-17
1994-03-29
Groody, James J.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
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
Grant Chris
Groody James J.
Zenith Electronics Corp.
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