2023-05-16, 09:54 PM
(2023-05-16, 09:32 PM)bronan Wrote: I was kinda surprised just how close even the imperfect analog sources ended up scoring. The thing that I didn't really expect though is why stereo stuff scored so high in the 65-70% range. It seemed awful high to me to say that the channels are 70% the same on average. But, after giving it some more thought, and seeing the result of the Fake Stereo tests it does make some sense.
If a 100% score is channels being exactly the same, then 0% would be the channels completely opposite, ie. one super loud and one super quiet. The Fake stereo stuff is processed so heavily with voices completely in one channel, that ends up happening and they scored low around 30-40% the same. But then it occurred to me that when you mix for stereo, the actors are usually directly in front of the camera so the separation level is small anyway. So our scale is roughly:
I think mono analog sources scoring close to 1 makes sense since it's mainly just differences in noise. They should be 95%+ the same and shouldn't change the soundstage if at all.
Joint Stereo mp3s can save you a lot of space (vs true stereo) since both channels share a lot of info so I'd assume that is what is happening here too with the 65-70% range for stereo mixes. Not just actors voices, but music, even in stereo is still a lot of the same data in both channels.
