Quote:
Originally Posted by ppppenguin
Two problems about adding DC restoration to a TV.
1: EHT regulation matters more with true black level. Change in mean brightness of the pcture may give unacceptable change in size. This sort of effect might explain your problem.
2: If the set has mean level AGC (common with +ve modulation, probably less so with -ve) then the DC restoration won't be so effective. Partly because contrast will vary with average picture level, partly because sync amplitude will vary with APL. Since a simple DC restorer stabilises sync tip, brightness will still vary with APL.
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To clarify how it behaves: almost like losing horizontal lock a bit when the contrast or brightness are turned up high. The picture bends and pulls toward the right, and then straightens out when either the scene changes, or the contrast or brightness are manually reduced. The black level is better with this modification.