Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1997-09-17
2000-01-11
Lee, Michael H.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348679, 348255, 348910, 386 9, 386 93, 4552391, 330281, H04N 552
Patent
active
060141808
ABSTRACT:
In an automatic gain control loop circuit supplied with two channel signals alternately input thereto, a first capacitor filter and stores the first signal output from the level detector circuit, and a second capacitor filters and stores the second signal output from the level detector circuit. The second signal is output only during the signal period of a second channel included in the two channels. An adder adds the second signal stored in the second capacitor to the first signal stored in the first capacitor. A switch selects the first signal stored in the first capacitor during the signal period of the first channel, and selects an output from the adder during the signal period of the second channel. The selected signal is fed back to the gain control input terminal of the variable-gain amplifier circuit. With there features, a flicker is prevented from occurring when the two channel signals are switched.
REFERENCES:
patent: 4417284 (1983-11-01), Sato
patent: 4422049 (1983-12-01), Akagiri et al.
patent: 4884141 (1989-11-01), Hyakutake
patent: 5276517 (1994-01-01), Matsuzawa et al.
patent: 5386296 (1995-01-01), Craft
patent: 5510853 (1996-04-01), Kawano
patent: 5532829 (1996-07-01), Kawamura
Desir Jean W.
Kabushiki Kaisha Toshiba
Lee Michael H.
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