What is a Good Book on High End Audio? - Page 8 - AVS Forum
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post #211 of 235 Old 10-23-2013, 10:15 AM
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Quote:
Originally Posted by Ethan Winer View Post

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Originally Posted by arnyk View Post

Musical instruments can easily create harmonics above 50 KHz:

Yes, and jingling keys is a common test for microphones. I did that years ago with a Telefunken U47 into a Hewlett-Packard real-time analyzer. I was surprised to see substantial content all the way up to the 50 KHz limit of the analyzer.

--Ethan

I was fooling around with the Wayback machine and found that it provides good access to many of the files on the old PCABX site

This page relates to high frequency hearing:

http://web.archive.org/web/20050410163343/http://64.41.69.21/technical/sample_rates/index.htm

This is the home page for all of the training files:

http://web.archive.org/web/20050207224240/http://www.pcabx.com/technical/index.htm

Of special interest might be the jitter training files:

http://web.archive.org/web/20050210185932/http://www.pcabx.com/technical/jitter_power/index.htm

and the spectral response of my keys jangling file:



This was made back in Y2K with a B&K 4006 measurement microphone feeding a CardDeluxe, if memory serves.
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post #212 of 235 Old 10-23-2013, 10:29 AM - Thread Starter
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Amazing!
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post #213 of 235 Old 10-23-2013, 11:47 AM
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Originally Posted by arnyk View Post

I was fooling around with the Wayback machine and found that it provides good access to many of the files on the old PCABX site

...

This was made back in Y2K with a B&K 4006 measurement microphone feeding a CardDeluxe, if memory serves.

I am wondering how close the mic was to the keys? Would it still record this at say 1 meter? 10 meters?
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post #214 of 235 Old 10-23-2013, 11:48 AM - Thread Starter
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post #215 of 235 Old 10-23-2013, 11:52 AM
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Well, the software developer of Spek has spoken and I am devastated to report that I had managed to make a fool of myself once again. True, I had "no idea WTF I was taking about". Thank you, ArnyK, AndyC, and Mcnarus for pointing that out.
....
Thanks again.

Not a problem. It is better to be that fool for 5 minutes, or a few days in this case, then the rest of your life. And, it seems that you can change your mind. that is a start.
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post #216 of 235 Old 10-23-2013, 11:55 AM
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With 15 trials, 60% is not statistically significant. Good guessing, I suppose. wink.gif
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post #217 of 235 Old 10-23-2013, 11:58 AM - Thread Starter
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With 15 trials, 60% is not statistically significant. Good guessing, I suppose. wink.gif

Absolutely. How could I assign HD to MP3 though? They sound different when I know what is playing. Unbelievable!
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post #218 of 235 Old 10-23-2013, 11:59 AM
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Quote:
Originally Posted by CharlesJ View Post

Quote:
Originally Posted by arnyk View Post

I was fooling around with the Wayback machine and found that it provides good access to many of the files on the old PCABX site

...

This was made back in Y2K with a B&K 4006 measurement microphone feeding a CardDeluxe, if memory serves.

I am wondering how close the mic was to the keys?

Within a meter.
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Would it still record this at say 1 meter? 10 meters?

Unless you are trying to make a point about losses due to air, I don't know why one would avoid micing at a close distance such as 1 meter.
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post #219 of 235 Old 10-23-2013, 12:06 PM
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With 15 trials, 60% is not statistically significant. Good guessing, I suppose. wink.gif

Here is a standard way to evaluate this situation:

http://home.provide.net/~djcarlst/abx_bino.htm



With 15 trials and only 9 correct the probability of the observed results being due to random guessing is 0.304 or 30.4 percent, which is well below the commonly-used standards of 0.05 or 0.01.
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post #220 of 235 Old 10-23-2013, 12:11 PM - Thread Starter
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That very well may be, the real question is how do I get a refund all these Studio Masters I purchased? mad.gif
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post #221 of 235 Old 10-23-2013, 12:17 PM
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Quote:
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Originally Posted by arnyk View Post

.....

Sound at those high frequencies looses intensity rapidly as it passes through the air.

http://www.sengpielaudio.com/calculator-distance.htm

A more serious problem is that the response of most recording microphones falls off rapidly above 20 KHz. Heck, many start rolling off rapidly at 15 KHz, and they have more serious problems off-axis, just like speakers. If you read the details in the article I cited above, the author used a 1/4" measurement microphone that is rarely if ever used for making practical recordings, partially because it is omnidirectional and partially because it has poor dynamic range (noisy!).

That link shows SPL drop as distance increases. No mention about greater drop off than 6 dB per doubling distance at >20kHz unless I missed it someplace on that page even after looking it over several times for this.

Whoops. Right site, wrong calculator!

http://www.sengpielaudio.com/calculator-air.htm

Thanks for pointing out the error!
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post #222 of 235 Old 10-23-2013, 12:20 PM
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Quote:
Originally Posted by CharlesJ View Post

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Originally Posted by grigorianvlad View Post

Well, the software developer of Spek has spoken and I am devastated to report that I had managed to make a fool of myself once again. True, I had "no idea WTF I was taking about". Thank you, ArnyK, AndyC, and Mcnarus for pointing that out.
....
Thanks again.

Not a problem. It is better to be that fool for 5 minutes, or a few days in this case, then the rest of your life. And, it seems that you can change your mind. that is a start.

Agreed. The only way I know to avoid making mistakes is to avoid doing anything. ;-)

Criticizing people for not making enough mistakes is becoming common practice in highly innovative companies such as Google.
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post #223 of 235 Old 10-23-2013, 12:31 PM
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That very well may be, the real question is how do I get a refund all these Studio Masters I purchased? mad.gif

Caveat emptor. Why would they owe you a refund or are you just joking? Add that book you started out with if you're going to try. wink.gif

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post #224 of 235 Old 10-23-2013, 12:35 PM
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How could I assign HD to MP3 though? They sound different when I know what is playing. Unbelievable!
It is unbelievable until you experience it. Welcome to the world of enlightened audiophilia.
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That very well may be, the real question is how do I get a refund all these Studio Masters I purchased?
You don't, of course, but remember that they still sound very, very good. So enjoy them.

If you can't explain how it works, you can't say it doesn't.—The High-End Creed

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post #225 of 235 Old 10-23-2013, 12:44 PM - Thread Starter
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You don't, of course, but remember that they still sound very, very good. So enjoy them.

LOL! You are killing me. No, they dont sound as good anymore. Once you know what sausage is made of ... You know the rest
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post #226 of 235 Old 10-23-2013, 03:24 PM
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Absolutely. How could I assign HD to MP3 though? They sound different when I know what is playing. Unbelievable!

That is the issue, knowing what is playing clouds the judgement, a human flaw that cannot be erased hence the need for blinding. biggrin.gif
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post #227 of 235 Old 10-23-2013, 03:28 PM
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... The only way I know to avoid making mistakes is to avoid doing anything. ;-)

...
But, that might be a mistake as well. Lifespan is zilch. wink.gifbiggrin.gif
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post #228 of 235 Old 10-23-2013, 03:35 PM
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Originally Posted by arnyk View Post

Within a meter.
Unless you are trying to make a point about losses due to air, I don't know why one would avoid micing at a close distance such as 1 meter.

Quote:
Originally Posted by arnyk View Post

Whoops. Right site, wrong calculator!

http://www.sengpielaudio.com/calculator-air.htm

Thanks for pointing out the error!

That link did it, thanks:D

Since I am not familiar with recording techniques of mic placements, I would think a larger ensemble or orchestra then would need a mic at each instruments to capture all that ultasonics. Air has a pretty good absorption of it.
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post #229 of 235 Old 10-23-2013, 03:35 PM
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Good on you vlad for having a go, and being honest enough with yourself to accept the results, even though they were against your initial feelings on the subject.
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post #230 of 235 Old 10-23-2013, 03:45 PM
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LOL! You are killing me. No, they dont sound as good anymore. Once you know what sausage is made of ... You know the rest

What I experienced was a change in expectation. I stopped expecting audible differences in electronics and now I don't even hear differences sighted. I'm glad the experience was valuable for you. It sure was for me and the rest of us.
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post #231 of 235 Old 10-23-2013, 04:11 PM - Thread Starter
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Good on you vlad for having a go, and being honest enough with yourself to accept the results, even though they were against your initial feelings on the subject.

Thanks for the kind words, everybody.
I knew something good would eventually come out of listening to Claire Martin's "I Only Have Eyes for You" in different formats about 400 times. You wouldn't believe the sort of torture I've put myself through. biggrin.gif
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post #232 of 235 Old 10-23-2013, 04:35 PM - Thread Starter
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Agreed. The only way I know to avoid making mistakes is to avoid doing anything. ;-)

Criticizing people for not making enough mistakes is becoming common practice in highly innovative companies such as Google.

How very true.
The entire body of human wisdom is a collection of lessons learned from someone else’s mistakes. You can read a thousand books filled with such hard learned wisdom and forget them all the next day. But you can’t forget your own errors for a very simple reason. They are your mistakes. As long as you are willing to learn from them – they are your assets.
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post #233 of 235 Old 10-24-2013, 04:27 PM
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Thanks for the kind words, everybody.
I knew something good would eventually come out of listening to Claire Martin's "I Only Have Eyes for You" in different formats about 400 times. You wouldn't believe the sort of torture I've put myself through. biggrin.gif

400 times? Yes, that is torture. wink.gifbiggrin.gif
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post #234 of 235 Old 10-24-2013, 06:50 PM
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Thanks for the kind words, everybody.
I knew something good would eventually come out of listening to Claire Martin's "I Only Have Eyes for You" in different formats about 400 times. You wouldn't believe the sort of torture I've put myself through. biggrin.gif

400 times? Yes, that is torture. wink.gifbiggrin.gif

I just sampled that on Amazon....Vlad you indeed have suffered for the art of understanding....

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post #235 of 235 Old 10-24-2013, 07:45 PM - Thread Starter
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I just sampled that on Amazon....Vlad you indeed have suffered for the art of understanding....
Quote:
My love must be a kind of blind love
I can't see anyone but you
Sha bop sha bop

Are the stars out tonight
I don't know if it's cloudy or bright
I only have eyes for you dear

The moon may be high
But I can't see a thing in the sky
I only have eyes for you

The stupidest song I have ever heard 400 times back-to-back in my life!
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