neodev
Neosd Tech
- Joined
- Nov 28, 2016
- Posts
- 256
The ODE portion of it is definitely the most alluring since no other PC-Engine products currently do that. However, since the product also provides RGB output and is a premium price I think the enthusiasts with high end setups also have high expectations. It's good to hear that audio levels can be adjusted in software. A future firmware update to address that is a completely acceptable solution.
There just seems to be a lot of noise in the video signal (and maybe audio to lesser degree) that's not present in other modern RGB solutions. I realize you're very busy trying to catch up on shipping orders, but I'm hoping once you get caught up that you'll be able to look into the video more and not just assume "oh, those crazy videophiles are at it again" :P (even if it ends up being a solution I have to solder in myself).
I'm also curious if other customers who are pretty technical are having similar results to what I'm seeing with the OSSC or similar devices (devices meant to upscale to a HDTV tend to be more likely show underlying video noise than just going straight to a CRT). That would help rule out if it's potentially every unit, or just mine.
The rgb circuit is separate from the rest of the circuit. I mean, it doesn't go through the fpga, it's 'passive', so the noise you see probably comes from one of the following sources:
One, the pce itself. Pces are quite noisy inside. I have a few of them, and one is especially noisy, while other is crystal clear (coregrafx seem to be less.noisy). Probably duo are better, and also I think internal mods may have better quality because they have shorter lines to the rgb source, and they aren't packed along other signal lines.
The power supply. The fact that you are seeing more noise when running a cd then when runing a hucard might me caused bit that. The SD, fpga, mcu are all powered from the 5V line output from the internal PCE regulator, so when accessing the sd, although there are several capacitors to mitigate it, there is a short peak of power usage which might create a little noise on the signal, depending on the regulator and capacitor status. Changing the power supply has little impact as long as it has enough voltage and intensity room, because the regulator inside the pce is then the limit. Also, ssds3 draws more power than an internal mod, so if any noise is present ( all pces seem to have some degree of noise in the video signal), when using the ssds3, it will be slightly higher, and a bit more when using cd compared to an internal mod
About the audio, we can adjust and improve it. Also, the adpcm has a linear interpolator that produces a slightly muffled sound, we'll experiment with other ones or removing it entirely.
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