A short few notes for those interested. AD converters have self-noise,
which in most cases will not even be lower than the equivalent of 16
bits, except for some pro cases and in case there are tricks being used
(which influence the bit accuracy). Say you have a 24 bits converter,
seldom will y
On Nov 30, 2013, at 11:28 AM, robert bristow-johnson
wrote:
> On 11/29/13 11:54 AM, Nigel Redmon wrote:
>> Not to Robert so much, but for anyone who hasn't thought too deeply about
>> guitar amps, maybe it's helpful to look at what you're up against.
>>
>> It's the extremely wide useful range o
On 11/29/13 11:54 AM, Nigel Redmon wrote:
Not to Robert so much, but for anyone who hasn't thought too deeply about
guitar amps, maybe it's helpful to look at what you're up against.
It's the extremely wide useful range of the distortion that fundamental to the
issue.
yes, and there's no gua
[Thomas Strathmann]
>BTW, for those who can read some German, this book
>
>https://hps.hs-regensburg.de/~elektrogitarre/
>
>might be a fascinating read. It's a scholarly treatise on the physics of
>e-guitars.
Nice! There's a truly dire need for the scientific approach to the
physics of the electr
My approach to this sort of thing is pretty basic:
1) lower the aliasing as much as possible at the algorithm level.
there are several tricks that can be used here, not just making the
curve have smooth derivatives at the end points, although that helps.
2) have a decent baseline level of quality
Not to Robert so much, but for anyone who hasn't thought too deeply about
guitar amps, maybe it's helpful to look at what you're up against.
It's the extremely wide useful range of the distortion that fundamental to the
issue. You want things to warm up a little with some mild overdrive. For a
well, i dunno how many "real-world implementation[s]" use the integral
of (1-x^2)^N or (1-x^N)^2 (the former was my proposal and the latter is
Stephan's idea). Nigel says it doesn't apply because his premise is
that he'll be clipping the polynomial anyway, so i presume the case for
"doesn't
Hi Stephan,
I don't disagree with Robert's formula at all. I'm simply saying it doesn't
apply. In a real implementation, you clip the signal as soon as you get outside
of the portion of the polynomial curve you're using. And that happens very
quickly. (Sure, you could say that you'll use a much
Jeff Smith wrote:
Hi I have a couple of questions... Let's start with the latter:
(1) How does a guitar amp distortion effect deal with aliasing. If you use
a transfer function like tanh, ...
Hi jeff,
I quickly looked at the webpage with effects, and must admid I didn't
spend the time to lis
Great reading. Enjoyed the extra article about the workshop amp with 7(!)
output transformers. Thanks for posting these links!
Steffan
On 29 Nov 2013, at 13:31, Thomas Strathmann wrote:
> BTW, for those who can read some German, this book
>
> https://hps.hs-regensburg.de/~elektrogitarre/
>
On 29.11.13 09:35, Tim Goetze wrote:
> Harmonics in electric guitar signals tend to roll off quite fast
> though. There's usually not much high-frequency spectral content to
> worry about, relaxing this requirement greatly in practice.
BTW, for those who can read some German, this book
https://h
Yes, there are definitely things you can take advantage of, if you know your
input is (probably) guitar (also, guitar cabinets roll off highs like mad on
the other side too). Of course, it kind of tosses a wrench in the works if the
user sticks a distortion stomp box in the path...Tim is right o
[robert bristow-johnson]
> On 11/28/13 1:16 PM, Nigel Redmon wrote:
>> how noticeable aliasing is on things like guitar note bends. Really quickly,
>> you'll figure out that 4x doesn't get the job done, and 8x is does it pretty
>> well at a reasonable cost.
>
> that's like saying you cannot approxi
Robert…If you're talking about distortion, of significance, you're *always*
talking about clipping that polynomial. Your "(N+1)/2 times oversampling" goes
out the window, and you simply need as much oversampling as will get the job
done. Don't forget that although the outlook get more grim as yo
On 11/28/13 1:16 PM, Nigel Redmon wrote:
It's really a pretty easy call in the end—one made by ear. Basically, you see
how noticeable aliasing is on things like guitar note bends. Really quickly,
you'll figure out that 4x doesn't get the job done, and 8x is does it pretty
well at a reasonable
Thanks Nigel, Thanks Thomas,
I glanced at David Yeh's introductory chapter in his dissertation and it's
full of great information. Anyone else who stumbles upon this thread should
also read that chapter. Link:
https://ccrma.stanford.edu/~dtyeh/papers/DavidYehThesissinglesided.pdf
On Thu, Nov 2
It's really a pretty easy call in the end—one made by ear. Basically, you see
how noticeable aliasing is on things like guitar note bends. Really quickly,
you'll figure out that 4x doesn't get the job done, and 8x is does it pretty
well at a reasonable cost. And yes, if you must, you can get awa
On 28.11.13 19:30, Nigel Redmon wrote:
> 2) There isn't a specific minimum requirement, so this isn't really an issue.
> That is, the more cpu you have, the more and better you can oversample, but
> you do what you need and what you can get away with. (You could go nuts and
> think that, well, t
1) Sure, oversampling. You need frequency headroom.
2) There isn't a specific minimum requirement, so this isn't really an issue.
That is, the more cpu you have, the more and better you can oversample, but you
do what you need and what you can get away with. (You could go nuts and think
that, w
Hi I have a couple of questions... Let's start with the latter:
(1) How does a guitar amp distortion effect deal with aliasing. If you use
a transfer function like tanh, you get lots of high frequencies well beyond
nyquist. How do commercial products like:
http://www.loopblog.net/tutorials/plugin
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