Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1997-03-20
1998-12-08
Faile, Andrew I.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348627, 348630, 348678, H04N 521
Patent
active
058477748
ABSTRACT:
A circuit for peaking video signals, which can be developed by combining a video signal with a peaking signal having a preshooting and a overshooting potion that are respectively controlled in peaking levels thereof. The circuit includes a delay circuit for delaying a luminance signal for a first predetermined time in order to generate a first delayed signal and for delaying the first delayed signal for a second predetermined time in order to generate a second delayed signal. An adder adds the second delayed signal to a current video signal in order to generate an added signal. A variable amplifying section amplifies the added signal in response to a first control signal from an exterior in order to generate a first variable amplified signal, and amplifies the added signal in response to a second control signal from the exterior in order to generate a second variable amplified signal. A selecting section compares the added signal from the adder with a reference signal, and selects the first amplified signal or the second amplified signal according to the comparison result. A subtracter subtracts the first amplified signal or the second amplified signal from the select section from the first delayed signal from the delay section in order to generate a subtracted signal as a peaked video signal. Therefore, the circuit can control the preshooting portion and the overshooting portion of the peaking signal used to peak video signals.
REFERENCES:
patent: 4069505 (1978-01-01), Burdick et al.
patent: 4350995 (1982-09-01), Harlan
patent: 4633303 (1986-12-01), Nagasaki et al.
patent: 4842457 (1989-06-01), Yamagata
patent: 5051818 (1991-09-01), Mishima
patent: 5243421 (1993-09-01), Nagata et al.
patent: 5285267 (1994-02-01), Lim
patent: 5335021 (1994-08-01), Sawada
patent: 5543859 (1996-08-01), Miyata et al.
Brown Reuben M.
Daewoo Electronics Co. Ltd.
Faile Andrew I.
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