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Xsim-3D development... I could use some math help
Xsim-3D development... I could use some math help
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Old 2nd February 2018, 12:44 PM   #91
nc535 is offline nc535
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Congratulations!

This is going to be great for using multiple drivers to shape/enhance directivity. I wonder if what you did with the woofers on small syns was the genesis for it?

I see your circuit blocks easily replicate IIR filters but I wonder what to do for FIR?

Jack
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Old 2nd February 2018, 04:46 PM   #92
bwaslo is offline bwaslo  United States
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Xsim-3D development... I could use some math help
I hope to add a PEQ circuit element when I get to it. For FIR, there's probably nothing I can do, an FIR design program is kind of out of scope (and there are already some pretty good ones out there). You could generate a curve with RePhase and load that as the
"Acoustic Effect" file for the drivers.
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Old 3rd February 2018, 10:11 AM   #93
b_force is offline b_force
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@ bwaslo
I send you a PM with some ideas
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Old 13th February 2018, 02:18 AM   #94
bwaslo is offline bwaslo  United States
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Xsim-3D development... I could use some math help
Default It's coming along

Still a ways to go, but for anyone who wants to play a little before --

Index of /Xsim/BetaTest

And on a related note -- people ask for active and dsp filter functions, but a complication is that DSP filters have an inherent delay so if you mix dsp filters with analog or passive filters (on different drivers) you need to deal with that. Does anyone have any references on the inherent delay (delay when just passing a signal through the box, without filtering) of dsp PEQ boxes? I have some MiniDSP boxes and will be getting a sample of a new Dayton Audio device so I can measure them, but I'd like to be able to include that parameter without measuring every blasted box or board in the world!
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Old 3rd March 2018, 04:11 PM   #95
Cask05 is offline Cask05  United States
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Quote:
Originally Posted by bwaslo View Post
...My OmniMic program, though (can be downloaded free from Parts Express, and can do all the viewing and processing steps without buying the mic) does polar plotting, similar but not the same as yours. People can just feed it a series of FRD files with the angle given within the filename and it will do colored directivity diagrams in several forms.
Click the image to open in full size.
Bill, I just arrived at the party (and I haven't read all the responses here yet).

One question: how do I get directivity shown in the polar frequency response plot below 500 Hz in your OmniMic program? I've got directivity down to just below 100 Hz, but the plot stops at 500 Hz.

Chris

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Old 3rd March 2018, 05:51 PM   #96
Cask05 is offline Cask05  United States
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Quote:
Originally Posted by bwaslo View Post
...Does anyone have any references on the inherent delay (delay when just passing a signal through the box, without filtering) of dsp PEQ boxes?...
Xilica XP series apparently have an insertion delay of 1.5ms, the ElectroVoice Dx38 is 1.927ms, Yamaha SP2060 is 761μsec, and the Behringer DCX2496 (which I don't own) is "less than 1ms".
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Old 3rd March 2018, 06:59 PM   #97
bwaslo is offline bwaslo  United States
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Xsim-3D development... I could use some math help
Chris,

When you have a polar plot up in OM, look just to right of the "OmniMic" logo at bottom left -- there are two little yellow arrows that control the starting frequency for the plot. At bottom right are similar for the upper frequency.

Thanks for the info on the DSP boxes. Wow, about 1 to 2 msec entrance fee for having a DSP inline, Kind of makes combo DSP+passive (with the passive not going through DSP) not very practical for upper freq drivers.
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Old 3rd March 2018, 08:34 PM   #98
Cask05 is offline Cask05  United States
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Originally Posted by bwaslo View Post
When you have a polar plot up in OM, look just to right of the "OmniMic" logo at bottom left -- there are two little yellow arrows that control the starting frequency for the plot. At bottom right are similar for the upper frequency.
This must be a version issue with the application--there is no horizontal axis control in the "polar frequency response" window of the OmniMic version that you posted a link to above.

Actually the 1-2ms insertion delay is smaller than I remembered it being. The only penalty that you get with DSP filters is delay (especially true for FIR filters). I would instead put any passive crossover network after the DSP crossover on the loudspeaker drivers themselves (i.e., traditional passive loudspeaker practice) rather than trying to play passive/active games upstream of the DSP crossover. YMMV.

Chris
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Old 3rd March 2018, 08:44 PM   #99
bwaslo is offline bwaslo  United States
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Xsim-3D development... I could use some math help
You don't see these on your 'puter? This is with version 5.04 (though they've been there since the beginning). This is in Windows, right?

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Old 3rd March 2018, 09:11 PM   #100
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