Author Topic: Real Measurements  (Read 2442 times)

seagreen

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Real Measurements
« on: November 08, 2012, 11:09:49 AM »
No, nothing to do with ABX testing...

Even though I just got through bemoaning a thread at another forum, something good did come out of it.  (Who says we are biased?)

http://www.diyaudio.com/forums/multi-way/190663-can-you-have-sparkling-treble-but-without-sibilance-6.html#post2606211

Not only is the basic subject of DAC chip output spectra interesting (even though I personally got slaughtered for saying something very similar more than a decade ago), the entire approach for measurements is worth considering.
No double blind testing was used in the making of this post.

Gen. Dreedle

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Re: Real Measurements
« Reply #1 on: November 08, 2012, 03:22:40 PM »
Well, he obviously only speaks for himself:

Quote
Matt and I are still amazed that almost no audio designers have performed our simple test, and almost none of them are aware of the ferocious requirements to avoid slewing during Nyquist reconstruction. Our best guess is that very few big-name audio designer have access to HP RF spectrum analyzers, and don't know, or don't care, about looking at audio equipment in the RF domain. Out of sight, out of mind. Most audio designers are trapped in a 20 Hz to 20 kHz world, and blithely assume if they can't see it on a 100 MHz scope, it isn't there.

And I obviously only speak for me. So there!
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seagreen

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Re: Real Measurements
« Reply #2 on: November 08, 2012, 04:18:50 PM »
Keywords: almost, very few...

Are you saying that you are not amazed?   :-X
No double blind testing was used in the making of this post.

Gen. Dreedle

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Re: Real Measurements
« Reply #3 on: November 08, 2012, 07:21:22 PM »
No, because I have been saying for >20 years that audio designers can't design SPDIF stuff because they think that is audio, so they treat it with the "20 to 20" mentality.
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"

MystereoN

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Re: Real Measurements
« Reply #4 on: November 09, 2012, 03:00:57 AM »
What about digital experts @DIYA, who can design computer DDR memory?
SPDIF is digital, clocks are digital, PLL is digital, clock extraction is digital,....everything is digital. All that matters is 0 and 1, if you don't get bit errors, everything is perfect  ::)

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No, because I have been saying for >20 years that.......<snip>

I sincerely admire your passion for arguing with narrow minded deaf morrons, I would lose my temper long time ago
Never argue with a fool,
they will drag you down to their level,
then beat you with their experience!!!

seagreen

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Re: Real Measurements
« Reply #5 on: November 09, 2012, 03:54:13 AM »
I sincerely admire your passion for arguing with narrow minded deaf morrons

What he said...  Ahh, sorta.  I'm not sure passion is exactly the right word, but it's a quote after all.
No double blind testing was used in the making of this post.

MystereoN

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Re: Real Measurements
« Reply #6 on: November 09, 2012, 05:24:11 AM »
Yeah, passion isn't the right word, but Google translation wouldn't translate correct.
Passion should be substituted with "strong will, desire, passion, firmness, uprightness, stiff character". What is correct English word for this mix?
Never argue with a fool,
they will drag you down to their level,
then beat you with their experience!!!

seagreen

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Re: Real Measurements
« Reply #7 on: November 09, 2012, 07:51:37 AM »
Perspicacity?  No

Diligence?  No

Persistence?  Closer

Determination?  Perhaps

Tenacity?  Better

Resolve?  Maybe

How about pertinacity?  (My other choice was pestilence, at least for people at the receiving end.)


OK...  One aspect of this that I don't get, is that the 20-20 mentality is hardly insightful, thorough, or even good basic engineering.  I think overlooking things like that have been the cause of 76% of every engineering problem I've ever made for myself.
No double blind testing was used in the making of this post.