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Old 22nd June 2010, 11:06 AM   #1271
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Hi Mark,

Quote:
Originally Posted by mwmkravchenko View Post
Has anyone thought of being able to import AkaBak scripts?
Sorry, but that is not going to happen :-).

Quote:
Originally Posted by mwmkravchenko View Post
But I'm leaning more and more to trusting Hornresp more than AkaBak.
There is nothing wrong with AkAbak provided that the limitations of the software are clearly understood. See my Post #1099 for further details.

Kind regards,

David
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Old 22nd June 2010, 11:49 AM   #1272
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Default Hornresp Version 27.10

Hi Everyone,

Hornresp Version 27.10 has just been released. Changes are:

1. The impulse response and spectrogram tools have been significantly improved thanks to new code provided by Jean-Michel. Not only are run times faster, but results are now more accurate.

2. Impulse response and spectrogram results are displayed instantly when the tools are re-run with unchanged input parameter values.

3. The impulse response compare trace has been changed from light red to red to make it easier to see, as suggested by Oliver in Post #1249.

4. The Loudspeaker Wizard now works with Vtc values up to 999999.9.

5. The impulse response bug reported by Oliver in Post #1249 has been fixed.

Kind regards,

David
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Old 22nd June 2010, 12:14 PM   #1273
vadi is offline vadi  Austria
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Hi David,

that's nice not to have to wait for the calculation every time.
Here is the spectrogram of same box which I posted before.
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File Type: png 2.png (64.0 KB, 241 views)
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Last edited by vadi; 22nd June 2010 at 12:21 PM.
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Old 22nd June 2010, 12:28 PM   #1274
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Quote:
Originally Posted by vadi View Post
Here is the spectrogram of same box which I posted before.
Thanks vadi.

As you can see, there is more detail in the spectrogram generated using Jean-Michel's latest code.

Kind regards,

David
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Old 22nd June 2010, 07:20 PM   #1275
tb46 is offline tb46  United States
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Default Impulse Response - Post #1249

Hi David,

Thanks to you and Jean-Michel for the quick fix (Post #1249), and the color change. There seems to still be something minor amiss with the impulse response tool, even though it is very much improved. Please, see attached impulse response comparison, same simulation as before, Lpt changed from 1.78 to 1.79cm.

Regards,
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Old 23rd June 2010, 06:16 AM   #1276
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Quote:
Originally Posted by tb46 View Post
There seems to still be something minor amiss with the impulse response tool, even though it is very much improved. Please, see attached impulse response comparison, same simulation as before, Lpt changed from 1.78 to 1.79cm.
Hi Oliver,

Many thanks for this.

In my testing I had only compared Lpt = 1.78 against Lpt = 1.82, and because the results were almost the same I had assumed that the problem was fixed. I think this is probably one for Jean-Michel to look at. He is currently unavailable, but I will try to contact him early next week.

Kind regards,

David
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Last edited by David McBean; 23rd June 2010 at 06:22 AM.
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Old 23rd June 2010, 11:38 AM   #1277
iand is offline iand  United Kingdom
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Default Port lengths

Hi David

When using Hornresp to simulate a horn with a vented rear chamber, does the port length include any end correction?

Ian
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Old 23rd June 2010, 02:35 PM   #1278
tb46 is offline tb46  United States
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Default Post #1276 - Impulse Response

Hi David,

I have seen similar simulation artifacts with changes of the Vtc in tapped horn simulations using a throat chamber, it seems that the last update fixed that problem, but should I come across another one I'll let you know.

It would be great if you or Jean-Michel could shed a little light on the nature of the negative time impulse response stemming from the Fourier transform of the SPL response. I have a foggy idea of this having something to do with the distortion products, and the mathematics of the transform, but never got any further than that. Anything in layman's terms, or reference sources, will be appreciated.

Thanks again for the continuing effort.

Regards,
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Old 25th June 2010, 08:40 AM   #1279
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Quote:
Originally Posted by iand View Post
When using Hornresp to simulate a horn with a vented rear chamber, does the port length include any end correction?
Hi Ian,

The Hornresp simulation model does not require an end correction as such. The so-called 'end effect' is already taken into account in the way that the acoustical impedance is calculated (the port tube is rigorously modelled as a cylindrical horn - no simplifying end correction assumptions are necessary).

Kind regards,

David
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Old 25th June 2010, 08:54 AM   #1280
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Hi Oliver,

Quote:
Originally Posted by tb46 View Post
I have seen similar simulation artifacts with changes of the Vtc in tapped horn simulations using a throat chamber, it seems that the last update fixed that problem, but should I come across another one I'll let you know.
Thanks.

Quote:
Originally Posted by tb46 View Post
It would be great if you or Jean-Michel could shed a little light on the nature of the negative time impulse response stemming from the Fourier transform of the SPL response.
Jean-Michel is the resident expert on such matters :-). Hopefully he should be back online early next week...

Kind regards,

David
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