Hey great thread. I'm just wondering how well your solution worked in the end? Did you manage to feel tri-level sync to the camera you were using OK?
I'm working on a very similar project where I'm trying to make a custom tri-level sync generator to feed a Blackmagic Micro Cinema Camera which accepts sync on a little expansion port.
For what it's worth I actually took apart a Blackmagic "mini converter sync generator" to see how it worked. It seems their approach is to use a component HD video encoder (specifically the ADV7393) to output a Y/Luma signal that contains the sync pulse already - presumably they just output a test-pattern as this chip is able to do that.
Copying this approach is more code than I hoped so I've been trying to find other solutions which is how i've stumbled on this thread.
Mod: link to old Thread.
https://forum.allaboutcircuits.com/threads/how-to-generate-a-tri-level-signal.163522
I'm working on a very similar project where I'm trying to make a custom tri-level sync generator to feed a Blackmagic Micro Cinema Camera which accepts sync on a little expansion port.
For what it's worth I actually took apart a Blackmagic "mini converter sync generator" to see how it worked. It seems their approach is to use a component HD video encoder (specifically the ADV7393) to output a Y/Luma signal that contains the sync pulse already - presumably they just output a test-pattern as this chip is able to do that.
Copying this approach is more code than I hoped so I've been trying to find other solutions which is how i've stumbled on this thread.
Mod: link to old Thread.
https://forum.allaboutcircuits.com/threads/how-to-generate-a-tri-level-signal.163522
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