22-05-2017, 06:20 PM
Hi Jeffery
I take it then I should have been aiming to fill the active part of the 405 line with 702 pixels and not 720 as I have been doing, I will have to tweak the timings a bit to rectify that. I couldn't understand then how the pattern generator had the correct length of active line until I realized that I had the converter switched to 5:4 output when the generator was connected
.
I have got the 2 line interpolater going. I am using two FIFO's, a one line to provide the delayed line for the interpolater and another which will hold over five lines for the time redistribution. I am using the "cosine plus lift" shaped aperture, which is detailed in one of the BBC documents and the results are pretty good. I have plenty of resources left so may try a 3 line one, though a first sight at least, the aperture looks more complex.
Photos below from the converter and a screen shot of the resources used so far.
Frank
I take it then I should have been aiming to fill the active part of the 405 line with 702 pixels and not 720 as I have been doing, I will have to tweak the timings a bit to rectify that. I couldn't understand then how the pattern generator had the correct length of active line until I realized that I had the converter switched to 5:4 output when the generator was connected
. I have got the 2 line interpolater going. I am using two FIFO's, a one line to provide the delayed line for the interpolater and another which will hold over five lines for the time redistribution. I am using the "cosine plus lift" shaped aperture, which is detailed in one of the BBC documents and the results are pretty good. I have plenty of resources left so may try a 3 line one, though a first sight at least, the aperture looks more complex.
Photos below from the converter and a screen shot of the resources used so far.
Frank
