Hi,
I'm working with composite and RGB video signals from an old SEGA Master System. The video signals will eventually be upscaled and converted to VGA.
This question is related to my growing aspirations to understand the LM1881 Video Sync Separator, which is part of the above project. I have read the datasheet, and also some documents on the composite video waveform, and I can undertand how I can feed composite video into LM1881 pin 2, and get 'cleaned' composite sync signals (vertical sync + horisontal sync) from pin 1, and isolated vertical sync from pin 3. From pin 5 the chip outputs "burst/back porch sync". From looking at the diagrams, I'm almost ready to believe that this burst/back porch signal could also be called horisontal sync. Is this correct? Or if this is not correct, what is horizontal sync then, and can one get it from the LM1881.
My obsession with hsync and vsync stems from the VGA specs, that need separate sync signals to go with RGB. I know that the LM1881 is not an upscaler. I just want to understand a little better what is going on in the circuit, and how I could, if needed, produce hsync from a composite signal.
I'm working with composite and RGB video signals from an old SEGA Master System. The video signals will eventually be upscaled and converted to VGA.
This question is related to my growing aspirations to understand the LM1881 Video Sync Separator, which is part of the above project. I have read the datasheet, and also some documents on the composite video waveform, and I can undertand how I can feed composite video into LM1881 pin 2, and get 'cleaned' composite sync signals (vertical sync + horisontal sync) from pin 1, and isolated vertical sync from pin 3. From pin 5 the chip outputs "burst/back porch sync". From looking at the diagrams, I'm almost ready to believe that this burst/back porch signal could also be called horisontal sync. Is this correct? Or if this is not correct, what is horizontal sync then, and can one get it from the LM1881.
My obsession with hsync and vsync stems from the VGA specs, that need separate sync signals to go with RGB. I know that the LM1881 is not an upscaler. I just want to understand a little better what is going on in the circuit, and how I could, if needed, produce hsync from a composite signal.