09-08-2019, 08:18 PM
Spent some time changing the settings of the TVP5150 but no joy.
I have bodged in a LM1881 and used the odd/even output as a frame sync. The result is the first picture below. The horizontal displacement is not a problem as it can be easily shifted. There is some horizontal jitter. The embedded syncs looked to be a consistent distance from the active video. So I used the SAV signal in conjunction with the odd/even signal from the LM1881 to produce the frame sync. But the jitter is still there.
The second photo is the result of combining the embedded odd/even signal and SAV signal. The photo looks a lot better that it is. There is a lot of vertical jitter as well as the horizontal jitter.
The third photo is of the video clock from the TVP5150 which looks jittery.
As I type this I am begging to realise that I have probably contributed to the horizontal jitter. As the clock on the input side is from a different source to the clock on the output. The video just passes straight across which is not good!
Next I will clock the output from the input clock and see if that helps the jitter.
Frank
I have bodged in a LM1881 and used the odd/even output as a frame sync. The result is the first picture below. The horizontal displacement is not a problem as it can be easily shifted. There is some horizontal jitter. The embedded syncs looked to be a consistent distance from the active video. So I used the SAV signal in conjunction with the odd/even signal from the LM1881 to produce the frame sync. But the jitter is still there.
The second photo is the result of combining the embedded odd/even signal and SAV signal. The photo looks a lot better that it is. There is a lot of vertical jitter as well as the horizontal jitter.
The third photo is of the video clock from the TVP5150 which looks jittery.
As I type this I am begging to realise that I have probably contributed to the horizontal jitter. As the clock on the input side is from a different source to the clock on the output. The video just passes straight across which is not good!
Next I will clock the output from the input clock and see if that helps the jitter.
Frank
