Television – Image signal processing circuitry specific to television – Amplifiers
Patent
1992-02-14
1994-03-29
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Amplifiers
330261, 348687, H04N 557
Patent
active
052990087
ABSTRACT:
A tone correction circuit for a luminance signal which can provide several shapes of correction characteristics. The tone correction circuit comprises a circuit in which the current increases at a first specified voltage or higher and decreases at a second specified voltage or higher so that the current is outputted in a specified range and also provided is a circuit which serves to increase the current at the second specified voltage or higher. Thus, without changing the output voltage at the midpoint, the correction amounts at the minimum point and midpoint, the shifting amount of the midpoint, the correction amounts from to the maximum point and the correction amount at the maximum point, can be controlled so that an optimum output waveform can be obtained in accordance with a scene, and particularly, fuzzy control for the scene can be efficiently made.
REFERENCES:
patent: 3996608 (1976-12-01), Harwood
patent: 4422095 (1983-12-01), Hosoya
patent: 5057787 (1991-10-01), Arai et al.
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
Murrell Jeffrey S.
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