The Gedlee Metric Demystified - diyAudio
 The Gedlee Metric Demystified
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 21st February 2016, 10:07 PM #2 diyAudio Member   Join Date: May 2014 Location: Longueuil,QC,Canada I definitely would be interested in a Calc version!
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Join Date: Jan 2014
Location: Grosse Pte Wds MI
Quote:
Fail! Can't download it with Chrome, even after connecting a bunch of seemingly related google apps.

 22nd February 2016, 11:42 AM #4 diyAudio Moderator     Join Date: Oct 2002 Location: Chicagoland Blog Entries: 2 Downloaded no problem for me (also Chrome). 4.1 meg. __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
 22nd February 2016, 11:48 AM #5 diyAudio Member   Join Date: Mar 2014 Downloaded fine with Firefox so tried Chrome and worked fine with that as well, just clicked the download button next to the print button. So for me resounding Pass! Edit: SY beat me to it, but I was cross-browser testing.
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Join Date: Dec 2009
Location: Southampton and Aegina
Quote:
 Originally Posted by BaffleChallenged I definitely would be interested in a Calc version!
You should be able to download the .ods version for Calc here:

This version, which does not work properly in Excel, is a bit different from the Excel version. It incorporates two different solutions: Method A is the same as the Excel version; Method B uses line statistics to derive the coefficients for a polynomial expression of the transfer function T(x).

Method B was actually my original idea and predates Method A. It is not as precise as Method A, but in practice the two methods produce the same result for Gm to around 5 or 6 s.f. Method B is, however, more forgiving if the harmonics entered are not in exact quadrature.

The line statistics in Excel are nothing like as accurate as they are in Calc, which is why I removed Method B from the Excel version. But as Method A is an exact solution, this is not a great loss. I've left B in the Calc version principally because my Linux box died in December.

diyAudio Member

Join Date: Dec 2009
Location: Southampton and Aegina
Quote:
 Originally Posted by arnyk Fail! Can't download it with Chrome, even after connecting a bunch of seemingly related google apps.
Have you managed to download it? I have no issues in Edge. If you PM me with your email address I will email it to you if necessary.

 22nd February 2016, 09:14 PM #8 diyAudio Member     Join Date: Dec 2004 Location: Novi, Michigan All. In previous discussions, I cannot tell you how many times I have found that people misunderstood what I/we have done. Even so-called "experts" get it wrong. If the metric is useful, then fine, if it is pointless then that's fine too (personally, I don't do much "distortion" testing as it is not highly correlated with perception), but let's at least make sure that we all understand the principles and not continue to propagate the erroneous ideals that have abounded. Ludus - thanks for your work. I applaud the effort. __________________ Earl Geddes Gedlee Website Read about the highly acclaimed Geddes loudspeakers
Banned

Join Date: Jan 2014
Location: Grosse Pte Wds MI
Quote:
 Originally Posted by arnyk Fail! Can't download it with Chrome, even after connecting a bunch of seemingly related google apps.
Redid the downloads over 12 hours later, and this time I obtained good results.

Thanks!

Banned

Join Date: Jan 2014
Location: Grosse Pte Wds MI
Quote:
 Originally Posted by gedlee All. In previous discussions, I cannot tell you how many times I have found that people misunderstood what I/we have done. Even so-called "experts" get it wrong.
IME, the same thing applies to many situations where people who happen to advocate the importance of perceptually vanishing amounts of common artifacts and spurious responses make big errors trying to apply the effects of perceptual masking to distortion and noise measurements, if they try it at all.

Figures 3 and 4 in your first of the two papers seem to lay out the basics of this situation quite simply and clearly.

It may be a case of perceptual inability to correctly perceive reliable evidence that does not agree with their prejudices and long-held positions.

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