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Old 10th July 2009, 11:23 AM   #701
soongsc is offline soongsc  Taiwan
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I would think true polarity is very important in sound reproduction. It is my experience, that if a system has good enough fidelity, the difference between polarity if very evident and audible.
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Old 10th July 2009, 12:23 PM   #702
Jmmlc is offline Jmmlc  France
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Hello Soongsc,

Most transfer function in electroacoustics lead to non linear variation of the phase of more than 2 Pi between 20Hz and 20000Hz so the notion of "True polarity" has very little meaning in the absolute. It is even worst when it comes to an acoustic device with multiple source (e.g.: a tapped horn as modelized in Hornresp using the "conbined response ").

Many people define the polarity from a pulse measurement. If the pulse rises upward then the polarity is said "correct" .If the pulse comes downward then the polarity is said "inverted". Sometimes this correct polarity (within the bandwith) is not the true polarity.

I prefer myself to take as a basic hypothesis that, after group delay compensation, the phase between the frequency limits of the useful bandwith of the device has the correct polarity when it varies around 0° and reversely to say that the phase has the wrong polarity (inside the useful bandwith) when it varies around +180 or -180degrees).

One of the main goals for someone using Hornresp is to try to obtain a more linear phase versus frequency (d_phase / d_pulsation = k ) inside the bandwith of the device. But using the true polarity in a phase graph limited to -Pi to + Pi as in Hornresp leads to a more difficult analysis when the polarity is opposite (according to the definition I gave).

The "polarity check" module inserted in Hornresp while providing a better presentation of the phase has for goal an easier analysis.

Finally: the presentation of the phase depends on the use we want to do with it. In that thread, I once asked the question "what Hornresp users do with the phase curve". As long as nobody replies to that question I think that the best presentation of the phase is the one we have now.

Best regards from Paris, France

Jean-Michel Le Cléac'h

[
QUOTE]Originally posted by soongsc
I would think true polarity is very important in sound reproduction. It is my experience, that if a system has good enough fidelity, the difference between polarity if very evident and audible. [/QUOTE]
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Old 11th July 2009, 07:52 AM   #703
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Quote:
Originally posted by Jmmlc
Finally: the presentation of the phase depends on the use we want to do with it. In that thread, I once asked the question "what Hornresp users do with the phase curve". As long as nobody replies to that question I think that the best presentation of the phase is the one we have now.
Hi Jean-Michel,

Many thanks for the comprehensive comments. The presentation of phase (corrected or otherwise) continues to be a somewhat contentious issue, it would seem :-).

Kind regards,

David
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Old 11th July 2009, 08:37 AM   #704
soongsc is offline soongsc  Taiwan
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Jean-Michel,

Regardless of how each designer may conduct his work, I think we would want to see proper correlation between a model versus measurement. This just makes the design process more smoothly integrating with other tools that might be necessary to complete a system design.
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Old 12th July 2009, 08:32 PM   #705
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It might have been asked already, but how about linear expansion for horn segments. Should be great for TH where conical expansion is usually not doable or made.
Sure the difference is small with slow expansion but for sake of "compatibility" with reality
At least think about it.
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Old 14th July 2009, 09:25 AM   #706
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Quote:
Originally posted by David_Web
It might have been asked already, but how about linear expansion for horn segments.
Hi David_Web,

Please see:

http://www.diyaudio.com/forums/showt...99#post1781099

Kind regards,

David
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Old 17th July 2009, 09:13 PM   #707
GM is offline GM  United States
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Greets!

With V23 I'm getting an error when I click on the TH Wizard of all the new designs done so far today, but not any prior ones I've tried.

GM
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Old 18th July 2009, 05:15 AM   #708
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Originally posted by GM
With V23 I'm getting an error when I click on the TH Wizard of all the new designs done so far today, but not any prior ones I've tried.
Hi GM,

Now that is a weird one! I haven't made any changes to the Tapped Horn Wizard for some time now, so I have no idea what could be causing the problem - it just doesn't make any sense. You seem to have a computer that has taken a real dislike to Hornresp, for some reason :-).

If anyone else is experiencing a similar problem, could they please let me know. Thanks.

Kind regards,

David
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Old 18th July 2009, 06:08 AM   #709
GM is offline GM  United States
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Greets!

Yeah, it really took me by surprise. I've done several more designs, but get the error every time I click on the TH Wizard and of course it closes the program when I click OK. I don't have any problems with designs done before yesterday though, so a real head 'scratcher' since I've done nothing out of the ordinary.

Oh well, it's been a real long day, I'll uninstall/reinstall it after some rest and hopefully it will cure whatever ails it.

GM
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Old 19th July 2009, 03:54 PM   #710
zobsky is offline zobsky  India
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Default Importing / Exporting Individual designs

I'm not sure if this is possible, but is there a way to export / import particular designs to a portable format? I've always thought this would be a useful feature , especially for the purpose of presenting various designs on this board for critique.

Thanks
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