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Old 1st June 2009, 06:07 AM   #571
palesha is offline palesha  India
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Quote:
Eva :
Did you use any specific sofware to produce these drawings?
I used Coreldraw for this drawing.
Very user friendly & easy to use.
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Old 1st June 2009, 07:01 AM   #572
Eva is offline Eva  Spain
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Can Coreldraw recalculate the dimensions as you move the lines or vertexes?

Sorry for going slightly O.T.
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Old 1st June 2009, 08:37 AM   #573
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Hi David_Web,


Quote:
Originally posted by David_Web
Will damping and port be separate in the future?
Sorry, no.


Quote:
Originally posted by David_Web
I still think damping creates odd phase and GD shifts.
I agree :-).

Kind regards,

David
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Old 1st June 2009, 08:44 AM   #574
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Quote:
Originally posted by fb
Is there anything particular to enter for driver params? (for compression drivers)
Hi fb,

Compression driver electro-mechanical parameters are no different to those of any other driver. Finding the necessary values though, can be a bit difficult as this information is not normally released by the manufacturer.

Kind regards,

David
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Old 2nd June 2009, 08:32 AM   #575
Jmmlc is offline Jmmlc  France
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Hello David,

I just tried the new version of Hornresp and I am happy about how the pulse reponse operates. Everyone can now import the wave file in an audio analysis software.

As an example I imported in ARTA the pulse response resulting from the simulation of a TD2001 mounted on a 1 meter long tube and ARTA gave me the CSD you can see in attached file.

Do you think it could be intersting to allow to export the .wav for directivity angles different than 0° (on axis)?

BTW: you still have to improve the phase presentation, as it is very difficult to see the small variation of phase due to a change in an input parameter. ;-)


Best regards from Paris, France,

Jean-Michel Le Cléac'h
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Old 2nd June 2009, 01:37 PM   #576
tb46 is offline tb46  United States
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Default Impulse Response

Hi David,

Just back from a trip, and found the newest version of Hornresp. Again a big improvement, thank you.

Regards,
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Old 3rd June 2009, 08:42 AM   #577
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Hi Jean-Michel,


Quote:
Originally posted by Jmmlc
I just tried the new version of Hornresp and I am happy about how the pulse response operates. Everyone can now import the wave file in an audio analysis software.
Thanks for confirming that everything is working as it should, and thanks again for providing the necessary algorithms!


Quote:
Originally posted by Jmmlc
Do you think it could be interesting to allow to export the .wav for directivity angles different than 0° (on axis)?
The on-axis restriction could certainly be removed if you think it would be a worthwhile enhancement.


Quote:
Originally posted by Jmmlc
You still have to improve the phase presentation, as it is very difficult to see the small variation of phase due to a change in an input parameter.
Can I assume that showing "corrected" phase would overcome the problem? :-).

Kind regards,

David
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Old 3rd June 2009, 08:45 AM   #578
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Default Re: Impulse Response

Quote:
Originally posted by tb46
Just back from a trip, and found the newest version of Hornresp. Again a big improvement, thank you.
Hi Oliver,

Welcome back :-).

Kind regards,

David
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Old 3rd June 2009, 10:31 AM   #579
Jmmlc is offline Jmmlc  France
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Hello David,

May be you should ask the readers on DIYAudio what they think about the use of a phase curve corrected by a delay.

For loudspeaker measurement generally we introduce an arrival time in order to limit the number of -pi/+pi wrappings.

The equivalent within Hornresp could be a phase correction by a linear phase equivalent to the mean group delay inside the bandwith.

To help the discussion in that message you'll find the phase curve as given at the moment by Hornresp and by ARTA when importing the pulse reponse from Hornresp and setting the cursor at the exact middle of the signal window (sample N° 10 000).
As you see the phase curves are nearly identical (another proof of how good is the export pulse response function).

In a second message I'll show the same phase curve but adding a delay.

Best regards from Paris, France.

Jean-Michel Le Cléac'h



Quote:
Originally posted by David McBean
Can I assume that showing "corrected" phase would overcome the problem? :-).

Kind regards,

David
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File Type: gif no_delay.gif (34.4 KB, 393 views)
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Old 3rd June 2009, 10:37 AM   #580
Jmmlc is offline Jmmlc  France
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Hello

Attached to this message you'll see, on left, a first graph showing the phase curve given by Hornresp but corrected by the mean group delay within the bandwith.

On right you'll see the phase curve given by Arta when the cursor is set at sample 10540.

In both case it seems to me that we can see more easily some phase variations which are difficult to see in the original phase curves.

Best regards from Paris, France

Jean-Michel Le Cléac'h
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File Type: gif delay_corrected.gif (22.5 KB, 401 views)
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