is this pong schematic you got ntsc or pal?
you should look up the timing signals for h and v sync of ntsc and pal. H and V sync need to be rather stable or you will get scrolling. also unless you get a color encoder chip or manage to make your own color encoder you will only get a b/w signal.
i dont think you will get much if you just feed whatever signals into the h and v sync. you need proper timing signals to get a good image. you might get some warbly lines, but it will get boring fast when you can't generate proper shapes and patterns.
ok so wikipedia is telling me that:
Horizontal Frequency 15.734 kHz
Vertical Frequency 60 Hz
So I can figure out how to build stable oscillators at those frequencies, but is it worthwhile to have theses oscillators variable?
And once I have the sync osc's fed in, what kind of input is it expecting or can be fed to the video in? _________________ http://www.youtube.com/user/borisandfef
is this pong schematic you got ntsc or pal?
you should look up the timing signals for h and v sync of ntsc and pal. H and V sync need to be rather stable or you will get scrolling. also unless you get a color encoder chip or manage to make your own color encoder you will only get a b/w signal.
i dont think you will get much if you just feed whatever signals into the h and v sync. you need proper timing signals to get a good image. you might get some warbly lines, but it will get boring fast when you can't generate proper shapes and patterns.
ok so wikipedia is telling me that:
Horizontal Frequency 15.734 kHz
Vertical Frequency 60 Hz
So I can figure out how to build stable oscillators at those frequencies, but is it worthwhile to have theses oscillators variable?
And once I have the sync osc's fed in, what kind of input is it expecting or can be fed to the video in?
The oscillator should be variable over a small range to adjust proper sync but it shouldn't be variable in the vco sense. Sync needs to stay locked at a constant frequency to work well.
there are blanking periods in video that need to be adhered to as well as voltage levels. i think composite is around a couple volts peak to peak, i wouldn't advise going much over that.
Once you get blanking done you can input any signal but very fast signals will produce better visuals. in the supersonic region. Anything under the h sync will produce a horizontal bar or flicker of some kind.
also, i dont really understand the blanking period. I get that it's the reset point for v and h lines (right?) but not how it's implemented and/or applied? _________________ http://www.youtube.com/user/borisandfef
Sorry, i was away all weekend for a festival i was performing at. I got to debut the video Synth in front of an audience. That was nice.
Blanking is a period where the video signal is not present at the beginning and end of a frame and line. You could blank a signal a number of ways, using village controlled switches or logic gates for example. You switch the video signal off for the specified blanking period to allow the display monitor time to fly back.
OK, sorry... finally... as promised earlier in this thread, my schematic for the CMP-DIV Video Effecter AKA Vidiffektor, even though it's a bit off-topic, and is only half CMOS. And produces results nowhere near as cool as Psyingo's work.
My friend who actually came up with the circuit had originally conceived it for audio, but then we wondered what it might do with video. We each took it in slightly different directions, but the core idea remains.
Warning: Use at your own risk. I cannot guarantee that this won't break equipment this is connected to. In certain cases, this can add a DC offset to the output signal, so it ends up between 1V and 2V. It is beyond my electronics knowledge to know if this is bad or not.
James.
EDIT: P.S. I used this circuit to produce my avatar-self-portrait... those wavy lines.
Ringmad, maybe you can post this separately in the new video Synth forum, where this thread now resides. That way people can find it easier.
Nice work there Psyingo. I find this quite inspiring and hope to contribute when I can.
I read through the other video synthesis threads and noticed that Lars, aka creatorlars, actually finished his design with Ed Leckie and is selling modules through analoguehaven. Here's a few links to his stuff. Looks good, worth aspiring to.
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