Mooly, do you know about the Gedlee metric for distortion? It's based on audibility. It's not perfect, but it's not complete yet. It hasn't been modified to add information about frequency-dependent distortions.
To me the frequency-dependent distortions are the most interesting part. I think if we had a number of listening tests using files run through special nonlinear circuits in LTSpice we might be able to gain some ideas about what should be in the frequency-dependent part of the Gedlee metric.
To me the frequency-dependent distortions are the most interesting part. I think if we had a number of listening tests using files run through special nonlinear circuits in LTSpice we might be able to gain some ideas about what should be in the frequency-dependent part of the Gedlee metric.
Continuing on that last post, why don't you guys give this a listen. I find it VERY interesting.
I've run Mooly's first file (because it was at hand) through a time-dependent SE distortion generator.
Ooh! Ahh!
https://www.mediafire.com/?4k39zvk3xs08r8z
EDIT: Oops, there's some big problems with this one. Still, an interesting example of distortion.
I've run Mooly's first file (because it was at hand) through a time-dependent SE distortion generator.
Ooh! Ahh!
https://www.mediafire.com/?4k39zvk3xs08r8z
EDIT: Oops, there's some big problems with this one. Still, an interesting example of distortion.
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OK folks. Here is what you've been waiting for.
Results
The devices were very different. Opamp A was an OPA604 and Opamp B the AD797. I think its fair to say that the images of the distortion showed the AD797 to be far superior when driving the low impedance load with the distortion remaining essentially off the radar. What of the listening tests though. Not so obvious perhaps.
Key for Listening Test Folders.
Ltest1 = AD797 Loaded.
Ltest2 = OPA604 Loaded.
Ltest3 = AD797 Unloaded.
Ltest4 = OPA604 Unloaded.
LtestA = OPA604 Loaded.
LtestB = AD797 Unloaded.
LtestC = AD797 Loaded.
LtestD = OPA604 Unloaded.
Results
The devices were very different. Opamp A was an OPA604 and Opamp B the AD797. I think its fair to say that the images of the distortion showed the AD797 to be far superior when driving the low impedance load with the distortion remaining essentially off the radar. What of the listening tests though. Not so obvious perhaps.
Key for Listening Test Folders.
Ltest1 = AD797 Loaded.
Ltest2 = OPA604 Loaded.
Ltest3 = AD797 Unloaded.
Ltest4 = OPA604 Unloaded.
LtestA = OPA604 Loaded.
LtestB = AD797 Unloaded.
LtestC = AD797 Loaded.
LtestD = OPA604 Unloaded.
You were quite clear to me the first time. I understood it just as you have described.
THx-RNMarsh
I'll try and remember that. Hopefully these issues will get fixed with any forum upgrades.
Not quite sure what have done there but its very obvious. Done with software ?
I think I know the papers you mean but I haven't studied them in depth tbh.
This one ?
Perception
The ADC input was a constant as before and that constituted the "unloaded" load. For "loaded" a 100 ohm was soldered in place from output to ground via a 1000uf cap.
But did it here on subjective grounds alone ?
I dropped a CFA into last years tests and it didn't excell judging by the votes.
I like the OPA604. Always have done although I've recently started favouring the LM4562 as being the most transparent. That detracts nothing from the OPA though which always turns in a stellar sonic result... you want to keep listening. Accuracy and objectives vs subjectives... same old story
Unfortunately, not. I use oldish Mac at home and its browser crashes when I try to connect to Onedrive. But don't worry, I will pull the files from dropbox later on some wintel machine. Thanks.
Yes Mooly, that's the paper.
The file I posted was flawed, but perceptually it shows something interesting I think. The piano at the beginning is crunchy but the sax and stuff after actually seem to be "enhanced". I can't know if this is a result of the errors or if it has to do with the SE distortion.
The file I posted was flawed, but perceptually it shows something interesting I think. The piano at the beginning is crunchy but the sax and stuff after actually seem to be "enhanced". I can't know if this is a result of the errors or if it has to do with the SE distortion.
That is, one might say, the very first stage on a long path. However, a small however..it is probably best, with regard to the idea of a journey, to not stop at that initial point of the journey.
In order to make the journey function, at all, it is probably best not to punish one's self, but to 'move on' (and along) in that journey. To realize it is a journey, one that will, in all known experience that is honestly self analyzed... to be never ending -even as we step into the grave, it still flows.
Within that sort of context, shared understanding can evolve along with the emergence of the end of argument.
Factualization being one of the most dishonest and self-denigrating forms of the self lie that the intrepid can ever tell themselves. Factualization creates the aura of security and knowing in the self -the most dangerous form of a self lie. With factualization and knowing comes permanence, and in that evolution and learning ends, it ends in death throes of projected violence toward the new and the unknown.
A recent example of this as human understanding has emerged, in the offering of an X-Prize of $10 million US to end the blockade against 'Free energy, or 'Over unity' technology systems. The widespread blockage of such systems is now recognized, publicly, by this given organization. The prize is offered for finished systems that can be demonstrated with a COP in excess of 1.
It is interesting to note that they have not addressed the prize title for this endeavor as an impossible technology, but specifically as a forbidden technology.
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KBK uses flowery language but that probably reflects mostly on the books he reads. You tend to pick up the style and mannerisms of the material you read no matter what. Flowery language is a tool of snake charmers but not exclusively. Some people just like flowers. Chilton manuals don't cut it.
KBK seems to be saying that once you know the brain is a liar and everything is not what it seems, you can learn it's patterns and become more objective as a person. Makes sense to me. Isn't that really just the basic process of growing as a person?
He seems to be addressing some assumption he has about SY's way of thinking, which comes off as rude but well-meant at best.
A lot of what he says does make sense, although he says it in such an archaic and lordly way that he defeats his own purpose.
KBK seems to be saying that once you know the brain is a liar and everything is not what it seems, you can learn it's patterns and become more objective as a person. Makes sense to me. Isn't that really just the basic process of growing as a person?
He seems to be addressing some assumption he has about SY's way of thinking, which comes off as rude but well-meant at best.
A lot of what he says does make sense, although he says it in such an archaic and lordly way that he defeats his own purpose.
Excellent job....
I like the OPA604. Always have done although I've recently started favouring the LM4562 as being the most transparent. That detracts nothing from the OPA though which always turns in a stellar sonic result... you want to keep listening. Accuracy and objectives vs subjectives... same old story
The OPA604 is a FET-input operational amplifier designed
for enhanced AC performance. Very low distortion, low noise
and wide bandwidth provide superior performance in high
quality audio and other applications requiring excellent dynamic
performance.
New circuit techniques and special laser trimming of dynamic
circuit performance yield very low harmonic distortion. The
result is an op amp with exceptional sound quality. The lownoise
FET input of the OPA604 provides wide dynamic
range, even with high source impedance. Offset voltage is
laser-trimmed to minimize the need for interstage coupling
capacitors.
Muh-hu-hu-hu-ha-ha-haaaaa!
I've got a handful around here somewhere ...
, no not snoopy, Garfield!
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