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Building a Headphone Measurement Lab - Page 24

post #346 of 355

did this post move? why did tyll stop posting here? did i miss something...  where'd everybody go?

post #347 of 355
Quote:
Originally Posted by Br777 View Post

did this post move? why did tyll stop posting here? did i miss something...  where'd everybody go?


Tyll went on a vacation, thats the reason for the silence around this thread for the moment.

post #348 of 355
Quote:
Originally Posted by Roger Strummer View Post

Tyll went on a vacation, thats the reason for the silence around this thread for the moment.



That's one looooooooong vacation. 

post #349 of 355
Thread Starter 
Quote:
Originally Posted by Br777 View Post





That's one looooooooong vacation. 


Yeah man. You have no idea. WAY more happened than I expected ... but that's another story for another place.

 

 

I just got back, and I'm going to spend this week getting reacquainted with my office and going through 2 1/2 months of emails. But next week you'll start seeing me more  .... around.

 

Good to be back.

post #350 of 355
Quote:
Originally Posted by Tyll Hertsens View Post




Yeah man. You have no idea. WAY more happened than I expected ... but that's another story for another place.

 

 

I just got back, and I'm going to spend this week getting reacquainted with my office and going through 2 1/2 months of emails. But next week you'll start seeing me more  .... around.

 

Good to be back.


Great to see you're back!!!  guitarist.gif

post #351 of 355

Hi Tyll,

 

was wondering if you were going to try and make the Seattle meet this October 2nd.

 

If not, i was wondering if you'd be kind enough to take some measurements of my Smeggy made Fostex thunerpants?

post #352 of 355
Quote:
Originally Posted by Tyll Hertsens View Post

Good to be back.

 

Wow, long vacation indeed. Good to see you're back and didn't "head south never to be heard from again". 
 

post #353 of 355

It'd be great to see some HE6 measurements to compare to the LCD-2

post #354 of 355

I wonder if Tyll (when he's around), Xnor or another member can tell me a few things about these measurements. Firstly, how is the raw frequency response data modified? By the looks to me, it might be based on Moller's diffuse field response? If not, do we have a name for and data of the modification applied?

 

Secondly, is the square wave response taking this into account or is it based on the raw output of the phone? I ask this because there is evidence of undershoot and ringing in the LCD-2, as well as a slope down to 0. Both of these suggest a. a boost in treble frequencies and b. insufficient bass response.

 

In the raw data for the frequency response of the LCD-2, it clearly shows a treble boost (which is necessary), relative to bass. However, in the compensated data it shows a clear roll-off.

 

Just looking for clarification, thanks.


If my suspicions are correct, is it possible to use a fourier transform to convert the compensated response to a square wave response?


Edited by MrGreen - 12/8/10 at 1:39pm
post #355 of 355

I think that the compensation is based on measurements with the artificial head in a diffuse field. Somebody has written similar in this thread.

 

Your second question is very interesting. I too would like to know the answer.

 

 

But other than identifying some overshoot or ringing I don't see much use in the square wave measurements. I think you'd have to correct both the frequency and phase response first to make it more useful. And you need the same information for FFT matters.


Edited by xnor - 12/8/10 at 2:09pm
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