Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1992-12-08
1995-04-25
Groody, James J.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348684, 348678, H04N 718
Patent
active
054103630
ABSTRACT:
An automatic gain control circuit 16 that can be used in a video transmission system 10 includes transmitter circuitry 18, receiver circuitry 20, and a fiber optic link 22 connected therebetween. The transmitter circuitry 18 injects an automatic gain control pulse having a known amplitude level into an electrical video signal. The transmitter circuitry 18 then converts the electrical video signal into an optical video signal, and transmits the optical video signal over the fiber optic link 22 to the receiver circuitry 20. The receiver circuitry 20 converts the optical video signal back into an electrical video signal and compares the amplitude level of the automatic gain control pulse in the electrical video signal to a reference having an amplitude level equal to the known amplitude level. The receiver circuitry 20 then adjusts the gain of the electrical video signal according to the amplitude level comparison so as to compensate for any amplitude level variations in the electrical video signal between the transmitter circuitry 18 and the receiver circuitry 20.
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Capen Ross D.
Keefe Kevin F.
Groody James J.
Harvey David E.
Lightwave Communications, Inc.
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