| Author | Message | ||
     Chris Redpath Rating: N/A |
So, I just got my revelator IR specs. They seems quite good apart from the fact that if I am using my (usb) modem at the same time, the specs won't sync to the screen properly and almost every time I move my (usb) mouse, I get the flashing screen syndrome for a few frames. I have an idea which may fix this, but it involves building hardware. My idea is: Make a new controller which works as follows: The controller monitors vsync and revelator control lines. When the DDC line goes high (revelator shows left eye image), take this as the trigger to start stereo mode. The controller then outputs the revelator control signals (alternate low/high for 1 frame) derived from the vsync line. If the DDC control line stays low for a number of successive stereo frame pairs then the controller assumes that the stereo mode is off. This would give us some resilience to IRQ misses causing the revelators to show both screens for a frame or two (I believe this is what causes the flashing). Of course, this will only work if the driver is still generating the correct frames even when the DDC signal is incorrect. Anyone have any comments as to why this could never work? | ||
| Andreas Schulz Rating: N/A |
Thought of something like this myself - just found no time yet to actually try it. You will need some JK-flipflop to get the Revelator signal from the VSync, where switching between Q and -Q output will make the L/R reversal. Add a one-shot/monoflop with retrigger, triggered by the DDC signal that drives one of the JK's static set/reset inputs to get on/off function (duration of 50-100ms should do the job). Maybe you can also make up some clever logic to sync the signal to the revelator to the DDC signal to get L/R allocation right automagically. Thinking more about it, when the DDC signal starts the circuit, it may be sufficiently reproducible to already get L/R phase right most of the time. | ||
| Chris Redpath Rating: N/A |
Yeah, that was pretty much what I was thinking. I doubt I'll ever get time to have a go, but I wondered if anyone else thought it would work :-) Perhaps someone with more time than me might like to have a go. A 6 week old son takes more time than you think! Chris |
