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Using Speaker Base to create a sound source
PostPosted: Fri Oct 15, 2004 9:06 pm Reply with quote
Hyun Paek
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I was wondering if anyone tried to create a sound source using speaker base.

I'm trying to create a speaker that will act as a gun shot.

The manual is confusing.
Re: Using Speaker Base to create a sound source
PostPosted: Mon Oct 18, 2004 2:28 pm Reply with quote
Peter Patrick
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>I was wondering if anyone tried to create a sound source using speaker base.

>I'm trying to create a speaker that will act as a gun shot.

>The manual is confusing.


What are you trying to create.???

A speaker is a speaker is a speaker!

It matters not whether it's reproducing a gun shot or a waterfall ... it's just a source.


If you want an omni-directional source that reproduces a pefect impulse there's no need to creat anything at all.

Simply use the generic *sphere* speaker in the EASE database.


Hope this helps.

best Regards

Peter Patrick

Re: Using Speaker Base to create a sound source
PostPosted: Mon Oct 18, 2004 3:44 pm Reply with quote
Hyun Paek
Guest
 





I'm actually trying to model loudness level of gunshots in a partially enclosed gun range.

I will need to model a speaker with the directivity and loudness of pistols and shotguns.

I have approximate SPL's measured in a free-field in the horizontal plane.

Do I just start out by modifying the 'sphere' speaker?


Thank you.

Re: Using Speaker Base to create a sound source
PostPosted: Mon Oct 18, 2004 3:47 pm Reply with quote
Stefan
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Hello,


why don't you just grab one of the excel templates in the Service area, modify them as you like and save them as an EASE file?


Stefan

Re: Using Speaker Base to create a sound source
PostPosted: Wed Oct 20, 2004 11:51 am Reply with quote
Joe Brusi
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I agree with Peter.


Out of curiosity, are you saying you have frequency response at various horizontal angles.


How did you measure that?




>I'm actually trying to model loudness level of gunshots in a partially enclosed gun range.

>I will need to model a speaker with the directivity and loudness of pistols and shotguns.

>I have approximate SPL's measured in a free-field in the horizontal plane.

>Do I just start out by modifying the 'sphere' speaker?

>Thank you.


Re: Using Speaker Base to create a sound source
PostPosted: Wed Oct 20, 2004 9:32 pm Reply with quote
Hyun Paek
Guest
 





Thank you. I've got it to work.


We have some measurements of guns. The rest were derived from a noise prediction program the military uses.



Re: Using Speaker Base to create a sound source
PostPosted: Fri Oct 22, 2004 3:09 pm Reply with quote
Peter Patrick
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>Thank you. I've got it to work.

>We have some measurements of guns. The rest were derived from a noise prediction program the military uses.

Hyun,

It would appear that IF you have real data on gun shot sound dispersion, whether the Military collected it or mother goose collected it, IF it's real data it really ought to be shared amongst those with a professional interest.


I would simply treat a gun- shot as a 100% omni source. IF that's wrong and there is real data to show the real case please share that data if that's legal and possible.


(I'm sure Stefan would include a shotgun as a source in EASE If the case is backed by real data ..... for listening Quoll's even.)

Best Regards

P.J.P.

Re: Using Speaker Base to create a sound source
PostPosted: Thu Oct 28, 2004 10:10 pm Reply with quote
Hyun Paek
Guest
 





Well, the data needs a bit of work. The SARNAM (small arms range noise assessment model program) data uses an equation based on their measurement data to calculate SEL levels at each horizontal angle, and we need to convert that or calibrate it to fit our measurements which consists of only a few points on the horizontal plane. I figure in the end it would only be an approximate model since we don't have any data in the vertical plane. I'm assuming that it would be symmetric.


(If the data is useful, do you think EASE will give us a free upgrade? ^^)


I also have a few questions.


1. In my model of the gun range I've put over 50 sources firing at the same time. The mapping seems to lump several sources into one. It seems to show only twelve sources in the mapping rather that the 50+ sources. Am I doing something wrong?


2. When I input the lobe data, do I need to enter the attenuation relative to 0 for the entire data including all the frequencies or do I need to treat the attenuation relative to 0 for each frequency?


3. Does the Sensitivity and Impedence play a large role in the data? If so any suggestions to what they should be?


Thank you.


Using Speaker Base to create a sound source
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