Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1993-02-02
1995-01-03
Harvey, David E.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348691, 348572, H04N 552
Patent
active
053790758
ABSTRACT:
A video signal AGC circuit including an analog gain control amplifier for adjusting the level of an input analog video signal; an A-D converter for converting the output of the analog gain control amplifier to a digital video signal; a sync level detector for detecting the sync level of the digital video signal outputted from the A-D converter; a digital gain control amplifier for adjusting the level of the digital video signal outputted from the A-D converter; a first control signal generator for generating a first control signal to adjust the gain of the analog gain control amplifier on the basis of the output of the sync level detector; and a second control signal generator for generating a second control signal to adjust the gain of the digital gain control amplifier on the basis of the output of the sync level detector. In this AGC circuit, the sync level detector includes a detector for detecting the sync signal of the output of the A-D converter; a detector for detecting, on the basis of the sync signal, the pedestal data corresponding to the pedestal level; and a detector for detecting, on the basis of the sync signal, the sync tip data corresponding to the sync tip level.
REFERENCES:
patent: 4680633 (1987-07-01), Gerdes et al.
patent: 4970594 (1990-11-01), Kitaura et al.
patent: 4989074 (1991-01-01), Matsumoto
Patent Abstracts of Japan, vol. 16, No. 517 (E-1284) 23 Oct. 1992 & JP-A-41 92 677 (Matsushita Electric Ind. Co., Ltd.) 10 Jul. 1992.
Patent Abstracts of Japan vol. 12, No. 118 (E-600) 13 Apr. 1988 & JP-A-62 245 780 (Mitsubishi Electric Corp.) 27 Oct. 1987.
Patent Abstracts of Japan vol. 11, No. 11 (E-470) 13 Jan. 1987 & JP-A-61 186 090 (Hitachi Denshi Ltd.) 19 Aug. 1986.
Patent Abstracts of Japan, vol. 8, No. 53 (E-231) 27 May 1982 & JP-A-58 206 214 (Nippon Denki K.K.) 1 Dec. 1983.
Matsumoto Hiroaki
Nagasawa Hirokazu
Yamaguchi Masahiro
Frommer William S.
Harvey David E.
Sinderbrand Alvin
Sony Corporation
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