OSSC Pro always fails to Auto Phase with 15kHz signal

[mahi1995]

I found related topics on this forum, but I couldn’t find any information on the new firmware, so I’ll start a new thread.

OSSC Pro’s firmware is 0.77
I tried the SNES with an RGB connection, and the Wii and PS2 with component connections.
RGB cable is from Retro Gaming Cables, and component cables are from HD Retrovision.
In both cases, the console is directly connected to the OSSC Pro.

Wii and PS2 480p signals can find the phase almost correctly.
15kHz signals like 240p and 480i will always be out of phase. Almost the opposite.
I’ve tried it on Wii, PS2 and SNES.
I have two SNES systems so I tried both and got the same results.

I’ll post an image from SNES as an example.

Is this normal with the current firmware, or is there something wrong with my unit?

[Zacabeb]

Since the OSSC Pro oversamples the input at low resolutions and discards samples to reduce jitter, it’s harder for it to find an optimal phase setting.

What I do instead is to set the phase manually by finding the worst setting that blends pixels the most and then offset the phase from that by 180°. It gives a good approximation of optimal phase.

[mahi1995]

thank you for your reply.

What I do instead is to set the phase manually by finding the worst setting that blends pixels the most and then offset the phase from that by 180°. It gives a good approximation of optimal phase.

I use this method too.
It’s easier than trying to find the right phase from scratch.
It seems like it’s become more difficult to find the optimal phase compared to OSSC Classic.

Going back to the topic, can I assume that this problem is common with OSSC Pro?

[marqs]

What I do instead is to set the phase manually by finding the worst setting that blends pixels the most and then offset the phase from that by 180°. It gives a good approximation of optimal phase.

This in indeed how the firmware could perform sampling phase detection & selection for oversampled sources by monitoring delta between 2 consecutive samples e.g. on G channel (or averaged brightness across all channels). It’s something that has been on my TODO for a while, but has not personally bothered me that much since lack of jitter makes phase selection more forgiving compared to Classic.

[mahi1995]

I don’t think a difference of around 30 degrees would be noticeable.

For now, I’ll just adjust it manually and save it in my profile.
I hope that Auto phase will be improved in the future.

Thanks for developing OSSC and OSSC Pro.

[Author]

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