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Progressive to Interlaced Converter

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helius:
When the inputs are on RCA connectors, you can at least tell quickly what is supported: CVBS only? S-Video? RGB and/or component? No guessing and you don't need to "check the repair schematics" to find this information.

paul_g_787:

--- Quote from: Benta on October 28, 2019, 07:44:01 pm ---What you need to realise is, that 95% of commercial European TVs do not have RGB inputs*. Check the repair schematics.
The SCART specification is wonderful, but almost always implemented as CBVS input (and output) only.

Your blurred text problem is because you expect VGA resolution from a bandwidth limited analogue video signal, RGB or CVBS both. It just won't work.

(*) we're still better off than in the US, where they have no SCART inputs at all.

--- End quote ---

I did not mention anything to do with the resolution. The VGA output is giving It is at 576 lines which is the same as composite video. My problem is it is progessive and not interlaced and the CRT TVs in the UK can only accept interlaced signals on Composite / S-video and RGB SCART.

The blurring is the cross-talk between the Red / Green / Blue  and Sync signals sharing the common conductor. The reason the VGA to composite devices are rubbish is because of the combining of the signals which the TV has to separate again.

I have also observed the blurring via Composite (CVBS) on the PlayStation 2, Playstation 3, Mega Drive 2 and my Sony DVD player. By using said devices RGB output and using a SCART connection which has 4 seperate coaxial cores for RGB and Sync the blurring is not present as there is no cross-talk, therefore a sharp image is seen with none of the blurring. (not to mention the colour-loss that composite suffers from too).

So what I am trying to find is one of those converters from VGA but tapping the RGB signals out before then get combined into composite.

The converter I have accepts progressive in, and scales the signal to 576i (or 480i), but unfortunately because it is in an SOP8 IC, I cannot tap the RGB signals out before they are combined to composite.

Ideal option here is to find an IC which has the same function but with RGB out.

paul_g_787:

--- Quote from: helius on October 28, 2019, 08:36:44 pm ---When the inputs are on RCA connectors, you can at least tell quickly what is supported: CVBS only? S-Video? RGB and/or component? No guessing and you don't need to "check the repair schematics" to find this information.

--- End quote ---

By simply looking at the SCART connector pins on the PCB I can see that the only pins that have traces are composite and audio (and blanking signal).

https://en.wikipedia.org/wiki/SCART

SCART is not that complicated when you look at it. The idea was to simplify connecting devices by only having one cable.

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