03-10-2020, 08:07 PM
I managed to get some time in the last while to spend on this project.
I have successfully combined the down converter and up converter. It will now generate any number of active lines from as ridiculously low as 4 to around 800.
I have added adjustable sync level. It can be adjusted from 20% to 50% in 5% steps. I think this should cover most needs.
A while back I added independent right and left crop.
I have also added vertical shift. The active lines are by default added before the frame sync. So if the number of active lines are less than to fill the screen the picture will appear towards the bottom of the screen.
Vertical shift inserts blank lines between the end of the active lines and the following field sync. This can be used to centre the picture vertically if doing letter box etc. It can be also used to insert the blank lines before the frame sync that is needed in the 819 standard.
I have also completed and tested 25Hz field output. I was actually able to test it on a 625 line monitor running at 50Hz field rate. The output of the converter was 625 lines at 25Hz. The monitor locked solidly to the 25Hz sync and if I used 288 active lines or less I would get a good but flickery image.
Photos below of 20 and 50% syncs.
Frank
I have successfully combined the down converter and up converter. It will now generate any number of active lines from as ridiculously low as 4 to around 800.
I have added adjustable sync level. It can be adjusted from 20% to 50% in 5% steps. I think this should cover most needs.
A while back I added independent right and left crop.
I have also added vertical shift. The active lines are by default added before the frame sync. So if the number of active lines are less than to fill the screen the picture will appear towards the bottom of the screen.
Vertical shift inserts blank lines between the end of the active lines and the following field sync. This can be used to centre the picture vertically if doing letter box etc. It can be also used to insert the blank lines before the frame sync that is needed in the 819 standard.
I have also completed and tested 25Hz field output. I was actually able to test it on a 625 line monitor running at 50Hz field rate. The output of the converter was 625 lines at 25Hz. The monitor locked solidly to the 25Hz sync and if I used 288 active lines or less I would get a good but flickery image.
Photos below of 20 and 50% syncs.
Frank
