CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS

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Author Topic: Different Stuff  (Read 8063 times)

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arnaud

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Re: Different Stuff
« Reply #20 on: August 24, 2012, 03:57:37 AM »
Hey, welcome!! Finally someone not talking out of his behind on this board (kidding, this really only applies to me).

Saw your article on SW soon after I posted and want to congratulate you on a neat article! Glad you found the time to write in spite of the limited audience. I had a few other examples in mind when we discussed it back then (you probably forgot since i've been slacking so bad), but I like the illustrations you made!
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arnaud

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Re: Different Stuff
« Reply #21 on: August 25, 2012, 05:04:55 PM »
I could dig a bit more around this and here are some preliminary results of SQW and Impulse Response of the Tyll's equalization curves (assuming minimum phase characteristics).

Tyll, in case you're ok with it, I can also plot the target curves and fitted filters, let me know.  :)p1

Note: DF for diffuse field, ID for independent of direction
Square wave 30Hz:



Square wave 300Hz:



Impulse response:





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arnaud

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Re: Different Stuff
« Reply #22 on: August 25, 2012, 05:13:56 PM »
I thing I just realized: these should be inverted as these curves are what should be subtracted from the raw data.
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Tyll Hertsens

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Re: Different Stuff
« Reply #23 on: August 25, 2012, 05:56:19 PM »
^^^Geek.  I bet you enjoy doing it, even when you do it wrong.
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Tyll (like on the floor only spelled different)

arnaud

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Re: Different Stuff
« Reply #24 on: August 25, 2012, 10:34:13 PM »
Went to bed at 2AM to do this while the kids are asleep, I guess that qualifies as geek borderline insane.

And in French, we say the important is to participate rather than win, so yeah, I am definitely enjoying it!

Let me know if I can show the eq. curve or not, extracting the inverse response is straightforward at this point actually.
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Tyll Hertsens

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Re: Different Stuff
« Reply #25 on: August 25, 2012, 11:37:15 PM »
Quote from: arnaud on August 25, 2012, 10:34:13 PM
Let me know if I can show the eq. curve or not, extracting the inverse response is straightforward at this point actually.

I don't see why not. It is specific to my particular head though.

Oh, and I would love to see the square wave post filter. TIA, mate.
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Tyll (like on the floor only spelled different)

arnaud

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Re: Different Stuff
« Reply #26 on: August 26, 2012, 12:58:26 AM »
Tyll, there you go  :)p12:

Overview:


Curve fitting results:



Reconstructed filters (FIR, minimum phase):



30Hz Square Wave response:



300Hz Square Wave response:



Impulse response:





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Tyll Hertsens

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Re: Different Stuff
« Reply #27 on: August 26, 2012, 04:53:43 AM »
Thanks mang. 

Always knew those curves weren't really right for headphones.  Gonna have to work on that.
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Tyll (like on the floor only spelled different)

arnaud

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Re: Different Stuff
« Reply #28 on: August 26, 2012, 05:36:23 AM »
Next step is actually to attempt to extract step response with the pinnae effect equalized out (using the same minimum phase hypothesis). Not sure how this will turn out but worth a shot...
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Tyll Hertsens

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Re: Different Stuff
« Reply #29 on: August 26, 2012, 06:35:53 AM »
Me thinks there might be a plan afoot, matey.

  :)p1

Perhaps we should jump in the dingy and chat?

 :)p8

 

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Tyll (like on the floor only spelled different)
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