Moderators: Dave Moll, Andrew Davie, Steve Anderson
Steve Anderson wrote:The frame retrace is visible as there is no sync pulse like for the line situation, this can be fixed but I need to look into it. I'll assume you're using the circuits posted above - with the correction mentioned a while back (my fault).
t's possible you may have the black level set a bit too high, this is easy to do on test-cards, especially if they're black/white with no greys. In broadcasting there's a test signal called PLUGE which is for the sole purpose of setting the monitor black level accurately though it still uses the MkI eyeball to do so. Below is one example, they varied between equipment manufactures but basically they're the same idea.
Steve A.
Steve Anderson wrote:OK, having refreshed my mind as to how I did this, you're correct in adjusting R705 and R725 for the different frame and line rates. The question is, what are the line and frame rates? I'm not clear on this. Given that data I can probably point you in the right direction. I need all the various standards you're hoping this to work on, it will, but I need the numbers.
e.g. Standard NBTVA 12.5Hz Frame, 400Hz Line, 32 lines per frame.
...and so on....
Do they all use the 'missing pulse' frame-sync system?
Steve A.
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