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CAMERA_HIGHLIGHT_EQUALIZER

2014-11-03 13:10  
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CAMERA_HIGHLIGHT_EQUALIZER
Provides better signal-to-signal noise ratio and improved definition over conventional aperture equalizers covering full brightness range. Since most image orthicon noise is in low light region, improvement is achieved by dividing signal into two parts and equalizing only relatively quiet highlight portion. Complete video signal is amplified and applied to white clipper and to difference amplifier V1-V2. Horizontal drive is also applied to clamp portion of circuit. Video signal is clamped at white clipper, where high-lights are clipped from signal-M. V. Sullivan, Highlight Equalizer Sharpens Tv Pictures, Electronics, 31:3, p 72-74.