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Users: digitalscream
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Ooooh... Charts and Graphs

Nah, I'm OK on that score. We don't have many guns in the UK ;) I'm interested in broadening my knowledge and conducting tests on quite a few different units (I'm in a position where I can probably rustle up most of the available modellers if I really put some effort in...depends mostly on...
- digitalscream
- Post #188
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

My wife reckons that's going on my headstone. "He's a bit of a dick, but he got results." (FYI, that's a direct quote from her... :D )
- digitalscream
- Post #184
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

Sorry, @FractalAudio - one other thing. If the difference is purely the noise due to aliasing, surely you wouldn't see anything else - like the ground loop? Can you think of anything else which might be present, given that?
- digitalscream
- Post #182
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

@FractalAudio - Thank you, the extra details were what I was after. @chris - Why would I argue? Four or fives pages later, I've finally got what I was asking for (after a lot of insults and condescension which - frankly - shout louder than any technical arguments about this community, but...
- digitalscream
- Post #174
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

And...condescension and relying on a fan-populated echo chamber to buttress your argument? Not a winner either, IMO. Seriously, I'm just asking for your methodology so that others can repeat it and test alternate hypotheses with a comparable method, that's all. If you're so confident that...
- digitalscream
- Post #170
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

OK, fair enough. Why isn't it present even as a slight bump in the Helix plot, then? I'm not asserting any facts - I'm questioning his findings, and all he's done thus far is fire off a condescending comment (having been through his history on here, that's something he definitely has a long...
- digitalscream
- Post #167
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

If you take the time to read the rest of the thread, you'll see that my reference to an "aliasing analyser" was somewhat tongue-in-cheek, because everyone seemed to be making the assumption that the extraneous frequencies could only be aliasing, whereas my hypothesis is that aliasing is not the...
- digitalscream
- Post #157
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

That's my current situation; it hasn't always been thus, it's just that my priorities at the moment don't involve the need for a better solution. What I can afford is the time to gain more knowledge, which is precisely what I'm trying to achieve here. The OP is very much aligned with that...
- digitalscream
- Post #155
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

...perhaps because I can read, and I've never felt the need to post before? I've always been curious about modelling, because I see it as the path to a future where guitar gear is more reliable, more efficient and lighter. I'm also no stranger to forums (been a member of a couple of guitar...
- digitalscream
- Post #152
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

No, I'm not stating my opinions as fact. I'm stating alternate explanations (hypotheses, if you will), which could be proven (or disproven, of course) with more details about the original tests since the information provided isn't sufficient to support the conclusions given. I'm not sure how I...
- digitalscream
- Post #149
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

Yes! Now we're getting somewhere. The issue here is that while the Axe models may exclude analogue thermal noise, the assumption in Cliff's post is that the Helix does too. Personally, I'm absolutely cool with the flaws of the original amp's topology being represented in the modelling...I can...
- digitalscream
- Post #144
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

No, I'm saying that the tests in the OP don't measure aliasing, unless something has been done to completely isolate the effect of aliasing (which it plainly hasn't) from any other effects. TrueRTA is a spectrum analyser, not an aliasing analyser. You'd be quite surprised how closely an amp's...
- digitalscream
- Post #136
- Mar 3, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

Hang on a minute...so you're saying that the gain was different on the units (but the aliasing depends on the gain), so the results are meaningless? The signal paths also appear to be different, hence the ground loop on the Axe tests... Can you actually post details of how you went about this...
- digitalscream
- Post #130
- Mar 2, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

As I said before - we have no control. If the noise in the "other" plot is actually representative of the real amp being modelled...well, we're down to an "accuracy vs improvement over the original" argument. The key word is "if", because we have no way of knowing and thus the provided info...
- digitalscream
- Post #89
- Mar 1, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

I'm just going to pick on this one because a) I'm a little pushed for time, and b) it's the most relevant to everything else I said. TrueRTA isn't just measuring aliasing - there is nothing done here which isolates the effect of the aliasing, which is my entire point. Those graphs, therefore...
- digitalscream
- Post #87
- Mar 1, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

True enough - in that statement, I was just taking Cliff's assumption (ie that it's all aliasing, apart from the bits that he says aren't) and running with it....
- digitalscream
- Post #83
- Mar 1, 2018
- Forum: Axe-Fx III Discussion
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Ooooh... Charts and Graphs

Hmmm...this strikes me as a pretty flawed "study", because it glosses over some hugely important facts. - Where's the control? I mean...you're right that analogue amps don't alias, but they *do* produce noise outside the the desired response to the input signal (background hiss, hum etc)...
- digitalscream
- Post #81
- Mar 1, 2018
- Forum: Axe-Fx III Discussion