02-11-2024, 09:04 AM
Hello FranK.
I have built a 625 => 819 lines converter.
It is based on 2 PIC16F268 microcontrollers, a pair of AL422 memories, A/D and D/A converters.
the firts microcontroller is used to fill the memory with video signal.
The second one is used to read at different speed the video signal, the two memories allow to be able to read sometimes twice the same lines, to create e delay of 1 line between memories, and allow to create additional lines by mixing two adjacent lines. The second microcontroller also create the timing signals, sync, ...
I used an EPROM for mixing the 8 bits data from the two memories and create intermediate lines (half sum of values). This is the best solutions i found and i was able to use.
th first PIC is using a xtal clock, the second one use a PLL clock, syncronised by 50hz vertical syènc signals, but it does not seems very stable for my opinion.
I would like to switch to FPGA, but i have no experience for that.
I have built a 625 => 819 lines converter.
It is based on 2 PIC16F268 microcontrollers, a pair of AL422 memories, A/D and D/A converters.
the firts microcontroller is used to fill the memory with video signal.
The second one is used to read at different speed the video signal, the two memories allow to be able to read sometimes twice the same lines, to create e delay of 1 line between memories, and allow to create additional lines by mixing two adjacent lines. The second microcontroller also create the timing signals, sync, ...
I used an EPROM for mixing the 8 bits data from the two memories and create intermediate lines (half sum of values). This is the best solutions i found and i was able to use.
th first PIC is using a xtal clock, the second one use a PLL clock, syncronised by 50hz vertical syènc signals, but it does not seems very stable for my opinion.
I would like to switch to FPGA, but i have no experience for that.
