/vr/ - Retro Games

>>1771046
>if you have to use Composite or S-video, try enabling the "trap filter" setting to eliminate some of the dot crawl
You know exactly what you are talking about, NOT.
A trap filter reduces a specific frequency while passing the lower and higher frequencies, in this case of analogue video it will be the color subcarrier.

On composite it will be used as part of the Y/C separation, taking out the subcarrier in the composite signal results into a low quality Luminance (Y) while doing opposite results into Chrominance (C). This basically converts composite into S-Video (Y/C).
An modern alternative to the classic trap filter is the remodulation of chroma then subtracting it from composite signal (known as adaptive comb filter, i read this in the TVP5150 datasheet), this results into less loss of details. This makes it more sharp and the dot crawl will be more apparent.

S-Video doesn't have dot crawl as it transmits Luminance and Chrominance separately but bad shielding can cause chroma interference in luma, this will appear as a moire pattern as the equiment won't filter it out because it assumes it is part of the picture.
Using a full blown trap filter on Luminance will make it look blurry as composite at the end, using a weak trap filter reduces the interference and quality while it looks better as composite.
But my point is that equipment might not give you the option of enabling the trap filter or the comb filter in S-Video as it is quite pointless.

>TL;DR S-Video+Trap filter=Does not compute by default