How/why does Dolphin generate sound frequencies above 17 KHz?

[nothingtosay]

Mere Wrote:I didn't see SoX when looking around, I did find a resampler and libresampler.

Yeah, I linked directly to the resampler portion of the larger program. I think it's the most popular part so they separated it for the convenience of people who want to use only it.

Thank you very much for your efforts and for compiling for me. I'll test anything you try out.

Mere Wrote:Certainly in my testing this build pretty much drops anything over 16khz (it does have a slope though, so there is some up to about 17khz)

There is a slope to the real Wii as well, going up to about 18 kHz. Is the slope configurable in any way so that it could be made to more closely emulate the hardware? The Wii lowpass seems to cut hard at 18 kHz, whereas SoX lets some through. (This is a pretty minor thing since I doubt it will change sound quality at all, but I figure it's worth doing if it can be done easily.) Here is a comparison of a 10-second channel intro (Shiren the Wanderer again) on hardware and with your patch.

Spoiler: (Show Spoiler)

And here is the same zoomed in to 17-24 kHz.

I'm sure you noticed those frequency spikes in the recording from the patched Dolphin. Well, I do indeed still get the occasional clicking sounds, so the lowpass filter doesn't seem to have fixed that. In fact, it seems to have made some new ones, I'm sorry to say. With the regular 4.0-330 I don't get any clicks when starting up the Wii system menu, but the patched version always produces four (at least) very clear clicks during the initial crescendo of music that it begins with. This is what they look like in the waveform:

Spoiler: (Show Spoiler)

Those frequency spikes correlate with glitches like the one shown there. It's not as bad as it looks in the channel intro recording because they're not all audible, I suppose they're being masked by the rest of the loud music, but obviously each spike represents a glitch that shouldn't happen. It doesn't appear to be 100% deterministic in where and when they appear as I've gotten a wide variance in the number and placing of them just in recording that 10-second channel intro. But some do appear to be consistent, like in the system menu music and the majority of spikes in the channel intro happen in the same places but not always with the same strength. The clicks happen in all audio backends. Any idea what's up with this? Are you getting the same thing?