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In Reply to: As I suspected..Walt did all the work, didn't he..you're just along for the ride.. posted by jneutron on May 28, 2004 at 10:17:15:
Folks, I decided to use this thread, because it is potentially libelous against me, to further explain the situation.
This is the situation: Earlier, I made a comment that sine wave analysis does NOT easily show the problems with DA. I backed this up with a reference to Walt's and my paper, published in 1985. For the record, Walt Jung WROTE the paper, and I did ALL the measurements and contributed insights to the ultimate design of the test, given my 100's of individual measurements. I am NOT as good a technical writer as Walt, so he wrote the paper, BUT the reason for the test being published was mine.
To say that I had a 'minor' part in this article is libelous.
No matter what I say, I can't win: If I take sole responsibility for something, then I compromise my associates. If I give references and co-responsibility to my colleagues, then I am accused of 'name-dropping' or even worse: Not doing a primary part of the research, yet taking credit for it.
My critics don't look for the real answers, but just to make any previous research suspect. What is the point?
Follow Ups:
To me I think this was a lot better answer than:Jneutron, you are full of crap. Do the work yourself.
But thats just my opinion of cause ;o)
Have fun!
Granholm, I found it insulting to be 'tested' after supplying a 'critic', as a professional courtesy, a copy of a paper Walt and I did almost 20 years ago, on DA. We did the work, replied to the critics at the time, including 2 Ph.D professors, and spent 100's of hours on the project. Our critics today, haven't left their armchairs, or even done a computer emulation of the test.
JC: ""Granholm, I found it insulting to be 'tested' after supplying a 'critic', as a professional courtesy, a copy of a paper Walt and I did almost 20 years ago, on DA.""Asking specific questions about a test is not criticizing...nor is it being "tested".
You have yet to learn that fact of life.
questions are asked to learn. If you are unable to answer the questions, say so..I do not ask them to delineate your threshold of understanding..It has been possible to do so based on the severity of your responses, however..the farther beyond your bounds of understanding, the more vile your response...you are behaving as if you are ashamed of not knowing an answer, so the only thing you can do is divert the thread to a flame war, to hide the fact that you do not know the answer...and there is no need for that..JC: ""We did the work, replied to the critics at the time, including 2 Ph.D professors, and spent 100's of hours on the project.""
Nobody has said otherwise..
However, your inappropriate response to questions..""jneutron you are full of crap" elicited a response in kind..had you stated yes, no, maybe so, don't know, gotta go...the thread would have remained civil..you, with your inexcusable behaviour, trashed it..
JC: ""Our critics today, haven't left their armchairs, or even done a computer emulation of the test.""
I do not have an armchair...and when I use a computer, I call it a "simulation"..
And all simulations are only as good as the model used for the physical device, and the accuracy of the code used. This is where the term GIGO came from, I believe..
So far, from all I have read to date, neither you or Walt have included within your capacitor model, the skinning of the current vs the geometry of the device..Why do you think large electrolytics have half their capacitance at 20Khz? Half...not some 1 meg or gigohm resistance and a small capacitor, like a DA model..but, a value which is consistent with half the working volume of the device not being present ..when the current slew rate reduces as charge is accumulated, the inner cross section of the device gets the current..that is an effect that has to be considered in the audio band. And that is not accounted for in your article..why should it be? The effect was not in mainstream models..
What capacitance value would you null out, with a waveform from an 8 uSec RC filter? Half the listed capacitance? All? a tenth?
That certainly explains why the lectro's had residues in the 10% ranges..
Your model, while accurate for the times ('86), went the way of the dinosaurs when high frequency switchmode supplies started to arrive..(and yes, yours was the same model I learned in undergrad work.)
Cheers, John
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