View Full Version : X'Eye noisy video
I have a unmodified X'Eye hooked through composite. There is noise in the picture, in the "produced by or licenced under Sega" screen the back background has faint vertical bars that are a wee bit lighter shade of black, the white text has bits of faint color in the edges.
Joe Redifer
11-24-2007, 01:59 AM
That's normal. Put in Sonic and run to a waterfall in the first level. See vertical rainbow stripes? Awesome, huh? You can get rid of them by using a 32X:
http://pixelcraze.film-tech.net/crap/sonicex.jpg
You can also upgrade to s-video or RGB to get rid of them.
That's normal. Put in Sonic and run to a waterfall in the first level. See vertical rainbow stripes? Awesome, huh? You can get rid of them by using a 32X:
http://pixelcraze.film-tech.net/crap/sonicex.jpg
You can also upgrade to s-video or RGB to get rid of them.
I'll probably go with a s-video mod to get rid them.
These are caused by shitty RGB encoder... my MD2's composite looks same, but RGB just kicks ass... I have no idea how S-video would look, better than composite, but how much, I don't know.
evildragon
11-24-2007, 03:21 PM
S-Video looks fairly close to RGB, but not quite. S-Video only falls on reds a little.
Sega-17
11-24-2007, 03:43 PM
yeah, S-Vid looks pretty fantastic compared to comp. very noticeable improvement.
And not a very hard mod to do. Worth they effort.
I sent my X'Eye to Old School Gamer for a S-Video mod, now I'm withdrawal as I suddenly have the urge to play Gunstar Heroes.
Joe Redifer
11-24-2007, 07:29 PM
These are caused by shitty RGB encoder.
No, they're caused by a shitty composite encoder.
No, they're caused by a shitty composite encoder.
So JVC used a shitty composite encoder in the X'Eye? Is something else that got downgraded from the Womdermega? Man I wish JVC just gave Americans the Wondermega.
Joe Redifer
11-25-2007, 03:23 AM
I don't know how the composite encoder is on the Wondermega. Not sure why they screwed America with the X'eye. It's not like they just took out the s-video jack. I think they changed the video encoder altogether to that of the Genesis 1.
RGB encoder !!! It takes RGB in, encodes it to S-vid, and that to composite, and that part itself is called RGB encoder in its datasheet.
evildragon
11-25-2007, 10:45 AM
I would say Sony screwed up. Technically it should be called an Chroma Encoder, but who cares?
I don't know how the composite encoder is on the Wondermega. Not sure why they screwed America with the X'eye. It's not like they just took out the s-video jack. I think they changed the video encoder altogether to that of the Genesis 1.
Stupid JVC, the Wondermega had so many feature: wireless controllers, motorized lid, S-Video, Digital Sound Processor settings (Game, Extra Base, Karaoke and Off), a sliding door where you have two mic jacs and a headphone jack each with separate volume control), a midi out jack and JVC ripped all these cool features out of the X'Eye.
Joe Redifer
11-25-2007, 06:33 PM
JVC hates countries that are not Japan.
There's no s-video conversion going on in that encoder.
evildragon
11-25-2007, 06:42 PM
JVC hates countries that are not Japan.
There's no s-video conversion going on in that encoder.
Composite still has Chroma elements, so it still can be called a Chroma encoder.
Matter of fact, I know how to convert S-Video to Composite with only 3 capacitors, and with decent quality too.
Joe Redifer
11-25-2007, 07:20 PM
What does anything you said have to do with anything you quoted me saying?
evildragon
11-25-2007, 07:34 PM
What does anything you said have to do with anything you quoted me saying?
Well, I have no idea why I said the second paragraph, to be honest. I was a little "off" then.
But my first paragraph, I thought when you said the chip had no S-Video, you were countering my statement calling it a Chroma Encoder.
Joe Redifer
11-25-2007, 09:01 PM
No, I was countering TmEE's statement that it encodes the RGB to s-video and then to composite.
evildragon
11-25-2007, 09:30 PM
No, I was countering TmEE's statement that it encodes the RGB to s-video and then to composite.
But he is right.
http://gamesx.com/temp/CXA1145.PDF
Notice the Composite Video out comes from the Y/C mixing circuit, which in turn gets it from the matrix that handled RGB.
Joe Redifer
11-26-2007, 01:40 AM
Is that the same chip that is in the Genesis 1? Because that's what the X'Eye has, I believe.
evildragon
11-26-2007, 01:45 AM
Yes.. It's the same chip.
This might be why the S-Video usually needs a buffer on certain parts, because it's being used internally for Composite encoding, and needs a little boost to actually be at a usable level on a normal television.
Joe Redifer
11-26-2007, 01:51 AM
That chip has shitty composite encoding, as I said earlier. Nowhere near as good as the Turbo's composite encoding.
S-video is a halfstep in that chip... you can hook up 2 wires to it, and you got it (though you need some amplification first).
Joe Redifer
11-26-2007, 10:11 AM
I wonder why the Neo Geo had much worse composite, since it used the same CXA1145 chip. Hell, the composite varied throughout different revisions on the Neo Geo.
Maybe different circuits around the CXA1145 ? I don't know, I've never seen inside a NegGeo
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