Comments on: NTSC hacking http://www.reenigne.org/blog/ntsc-hacking/ Stuff I think about Sun, 22 Jan 2012 21:39:31 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Scaling/scanlines algorithm for monitor emulation « Reenigne blog http://www.reenigne.org/blog/ntsc-hacking/comment-page-1/#comment-3599 Scaling/scanlines algorithm for monitor emulation « Reenigne blog Mon, 12 Oct 2009 23:09:40 +0000 http://www.reenigne.org/blog/?p=1017#comment-3599 [...] my TV emulation, I wanted to render scanlines nicely and at any resolution. xanalogtv does vertical rescaling by [...] [...] my TV emulation, I wanted to render scanlines nicely and at any resolution. xanalogtv does vertical rescaling by [...]

]]> By: Jim Leonard http://www.reenigne.org/blog/ntsc-hacking/comment-page-1/#comment-3597 Jim Leonard Sun, 11 Oct 2009 00:49:47 +0000 http://www.reenigne.org/blog/?p=1017#comment-3597 I think I'd be the first person ever credited for "roll velocity" ;-) I think I'd be the first person ever credited for "roll velocity" ;-)

]]> By: Pipeline architecture « Reenigne blog http://www.reenigne.org/blog/ntsc-hacking/comment-page-1/#comment-3596 Pipeline architecture « Reenigne blog Sat, 10 Oct 2009 23:02:41 +0000 http://www.reenigne.org/blog/?p=1017#comment-3596 [...] Reenigne blog Stuff I think about « NTSC hacking [...] [...] Reenigne blog Stuff I think about « NTSC hacking [...]

]]> By: Andrew http://www.reenigne.org/blog/ntsc-hacking/comment-page-1/#comment-3595 Andrew Sat, 10 Oct 2009 05:54:55 +0000 http://www.reenigne.org/blog/?p=1017#comment-3595 Thought you'd like it! Yeah, the horizontal sync needs a little work. It's fine with a composite signal but it's overly sensitive to the noise I'm adding to simulate an RF-modulated signal. Maybe if I filter out frequencies over 1MHz or so and then do some interpolation to find the sync position, that would work better. I may also need to use a higher order differential equation to model the PLL. I was pleasantly surprised to find out that one can do some fairly sophisticated processing there because one only needs to look at a small section of the signal. I should credit you for the vertical roll - I looked at some video you sent me a while back to determine the appropriate roll velocity for an IBM 5153 monitor! Thought you'd like it! Yeah, the horizontal sync needs a little work. It's fine with a composite signal but it's overly sensitive to the noise I'm adding to simulate an RF-modulated signal. Maybe if I filter out frequencies over 1MHz or so and then do some interpolation to find the sync position, that would work better. I may also need to use a higher order differential equation to model the PLL. I was pleasantly surprised to find out that one can do some fairly sophisticated processing there because one only needs to look at a small section of the signal.

I should credit you for the vertical roll - I looked at some video you sent me a while back to determine the appropriate roll velocity for an IBM 5153 monitor!

]]> By: Jim Leonard http://www.reenigne.org/blog/ntsc-hacking/comment-page-1/#comment-3593 Jim Leonard Sat, 10 Oct 2009 00:08:13 +0000 http://www.reenigne.org/blog/?p=1017#comment-3593 Well, that looks very promising!! I have to say though that there's more horizontal jitter than I remember from nearly all crappy CRTs I've ever worked with. The vertical roll was very cute :) I also loved watching the luma/chroma dot crawl :-D Well, that looks very promising!! I have to say though that there's more horizontal jitter than I remember from nearly all crappy CRTs I've ever worked with. The vertical roll was very cute :) I also loved watching the luma/chroma dot crawl :-D

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