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Multi-Way Conventional loudspeakers with crossovers

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Old 28th June 2010, 02:57 AM   #4381
gedlee is offline gedlee  United States
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John

Yes, it is wrong for the piston, nice catch. As I said before, the piston is simply a ficticious data set created to make sure that the program worked correctly. In this vein the DI was simply guessed and put in as some convenient function 1/f here, just so that I had data to plot.

I am still concerned with the absolute scaling of the DI, even though I have absolute confidence in its shape. Scaling in the process turns out to be a problem since from the first - in HolmImpulse - there is no scaling. So somewhere down the line you have to scale the DI to an absolute number. I do this based on the assumption that at some LF the polar response must be omni and the DI 0.0 dB. But at LFs there is a slew of errors and this scaling does not turn out to be that stable. And then there is a dipole! Thats a real problem.

But I'll get there at some point. And anyways, just as with the SPL, the absolute numbers aren't as important as the spectral aspects which are very accurate.
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Old 28th June 2010, 04:18 AM   #4382
poptart is offline poptart  Canada
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I simply asked what the program does as I can't see it and still don't know. I understand the performance limitations of programming for java vs native code, but nobody has explained what the program does so that I may understand why it needs to be native.
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Old 28th June 2010, 05:01 AM   #4383
gedlee is offline gedlee  United States
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It shows polar responses in three different views. There are screen shots on my web site now.

But the program is interactive and you can see the frequency response at different angles along with the DI, and the polar angle response at a particular frequency. It helps people to understand how the polar maps shows it all in one, albeit complex, plot.

It's beyond me how someone can not be able to run IE, simply because its MS. Seems to me like only Apple would be arrogant enough to exclude everything MS. Like Itunes and WMA. I find it simply ridiculous.

It needs to be "native" because thats what I program in.
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Old 28th June 2010, 05:16 AM   #4384
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I agree whole heartedly about Apples exclusion of anything MS! I wouldn't use a PC at all if they'd just make them Apples compatible with all my needs. The funny thing is, after using an Apple, I figured out how to better use my PC. My cousin works for MS and I have a hard time figuring him out as well.

Your program runs on all my machines with IE. It does not run with Firefox, Chrome, or Safari on any of my machines as of today.

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Old 28th June 2010, 07:14 AM   #4385
FrankWW is offline FrankWW  Canada
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I got it to run on Firefox in XP. I have all the .net stuff installed.
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Old 28th June 2010, 09:07 AM   #4386
Rudolf is offline Rudolf  Germany
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When trying to run polar_map from Firefox in Vista, I get this message.
Afterwards polar_map freezes and can't even be shut by the task manager. Any idea, what's going wrong?
Attached Images
File Type: gif polar_map.gif (71.6 KB, 476 views)
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Old 28th June 2010, 10:53 AM   #4387
poptart is offline poptart  Canada
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So is the viewer doing some heavy number crunching, FFTs etc, or just displaying data that has already been calculated?

IE ran on mac from the time it was created and was the default browser for Mac until Microsoft announced they were discontinuing it in 2003. No coincidence that this was the same year Apple released Safari. Today approximately 50% of all internet users are using IE and that's been dropping steadily for years.
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Old 28th June 2010, 12:02 PM   #4388
krzys is offline krzys  Canada
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Default same symptom for me

Quote:
Originally Posted by Rudolf View Post
When trying to run polar_map from Firefox in Vista, I get this message.
Afterwards polar_map freezes and can't even be shut by the task manager. Any idea, what's going wrong?
Same thing for me, XP SP3 and IE8
Chris
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Old 28th June 2010, 12:42 PM   #4389
soongsc is offline soongsc  Taiwan
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Quote:
Originally Posted by gedlee View Post
John

Yes, it is wrong for the piston, nice catch. As I said before, the piston is simply a ficticious data set created to make sure that the program worked correctly. In this vein the DI was simply guessed and put in as some convenient function 1/f here, just so that I had data to plot.

I am still concerned with the absolute scaling of the DI, even though I have absolute confidence in its shape. Scaling in the process turns out to be a problem since from the first - in HolmImpulse - there is no scaling. So somewhere down the line you have to scale the DI to an absolute number. I do this based on the assumption that at some LF the polar response must be omni and the DI 0.0 dB. But at LFs there is a slew of errors and this scaling does not turn out to be that stable. And then there is a dipole! Thats a real problem.

But I'll get there at some point. And anyways, just as with the SPL, the absolute numbers aren't as important as the spectral aspects which are very accurate.
Great program. I like the way data can be viewed like this.
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Old 28th June 2010, 12:55 PM   #4390
gedlee is offline gedlee  United States
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The problem is that I am just not that good a programmer for web apps - never done it before. Most of the errors seem to come from countires other than the US, but as I said, it ran fine in China. I could see that if the connection "times out" then anything is likely to happen since I don't do anything to detect that. The program failed for me a couple of times when I didn't have an internet connection.

Rudolf - the right part of the top plot is not part of anything that I wrote, so there seems to be a conflict with something on your computer. The solid read means that it had data, but they were all the same value - sounds like a connection problem.

I'll see if I can post an installation file so you can run it stand alone without a connection.
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