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Old 11th May 2012, 07:07 AM   #11
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The relative phase angle chart is very handy. Good job Charlie.
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Old 11th May 2012, 01:26 PM   #12
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I noticed that I forgot to post the link to the two-driver phase tracking extension, above.

Both the "core tools" and "extensions" are found on the same web page:
the Active Crossover Designer web page

Any time that there is a new addition, update, or change, I will post it there.

Enjoy!

-Charlie

Last edited by CharlieLaub; 11th May 2012 at 01:32 PM.
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Old 11th May 2012, 02:33 PM   #13
a.wayne is offline a.wayne  United States
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Will give this a test drive , thanks and appreciate the commitment ...

Regards ,
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Old 11th May 2012, 05:25 PM   #14
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Darn nice job!
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I may be barking up the wrong tree, but at least I'm barking!
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Old 12th May 2012, 12:56 AM   #15
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Default How to set the IIR sampling frequency in the ACD tools

In case anyone is using the ACD tools with a 2x8 MiniDSP board, you will need to change the sampling frequency. Details are provided below.

The sampling frequency is set in cell B22 of the BiquadCalcs worksheet in both the system response and all driver response worksheets. Here is a screen shot of what to look for:

Click the image to open in full size.


* If you use a 4 output MiniDSP product there is nothing that you need to do. The tools come preset with a sampling frequency of 48k Hz (48000 Hz), which is used in the 4 output MiniDSP products.

* If you use an 8 output MiniDSP product, set the sampling frequency to 96k Hz by entering 96000 in the cell.


This value can be set to any sampling frequency, in case you are using the tools to calculate the IIR transfer coefficients for another DSP unit (make sure to note that there are some slight sign changes with MiniDSP's coefficients).

I will be adding this as part of a new section that will be available in the next revision of the manual

-Charlie

Last edited by CharlieLaub; 12th May 2012 at 01:01 AM.
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Old 14th May 2012, 04:28 PM   #16
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Default coming soon: group delay and system phase plot

I thought I would provide a little sneak peek at an upgrade I am hoping to include in the next release of the system response spreadsheet:

SYSTEM PHASE !
GROUP DELAY !!


Here's how it's shaping up:

Click the image to open in full size.

-Charlie
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Old 22nd May 2012, 04:20 AM   #17
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I'd like to share with everyone that I have released an updated version of ACD, version 1.1.

This version has:
  • minor fixes
  • improvements to the phase unwrapping and interpolation formulas
  • added: system phase and group delay plot
  • allowed for an unlimited number data points in the reference response (up to Excel's row limit)
  • improved technical manual and added some new material (now at version 0.4)
I have also posted version 1.1 of the two driver phase tracking extension. I improved the formula for calculating the relative phase after I discovered a minor glitch.

You can find the new releases at the web site:
the Active Crossover Designer web page

These are both fully compatible with the earlier version.

-Charlie
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