If you have some experience with combining FRD files and/or minimum phase extraction please contact me (via PM or EMail) if you would be willing to try and give me feedback on this new Excel tool, especially if you encounter any problems. I'd like to make sure that there are no major fumbles before I put it out there. Please let me know if there is any functionality that is missing and needs to be added.
You will need to be able to import or paste in your FRD file data, and if you need help with this just let me know.
I've tested it out with a few different files, and it seems to work well for me in both Excel 2003 and 2010. See the attached plots of blended SPL and extracted phase at "low density" and "high density"...
If combining FRD files is something new to you, please wait for the "public" release.
Thanks!
-Charlie
.
You will need to be able to import or paste in your FRD file data, and if you need help with this just let me know.
I've tested it out with a few different files, and it seems to work well for me in both Excel 2003 and 2010. See the attached plots of blended SPL and extracted phase at "low density" and "high density"...
If combining FRD files is something new to you, please wait for the "public" release.
Thanks!
-Charlie
.
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I think that this makes the process a whole lot easier, and it nicely bundles everything into one Excel spreadsheet.
At this point it's working great, and I'm just trying to get some feedback from people who are knowledgable about this kind of thing in case there is other functionality that I need to add, or something that needs to be tweaked. Once I know that its a go, I will put together some instructions and do a public release on my web site.
-Charlie
At this point it's working great, and I'm just trying to get some feedback from people who are knowledgable about this kind of thing in case there is other functionality that I need to add, or something that needs to be tweaked. Once I know that its a go, I will put together some instructions and do a public release on my web site.
-Charlie
I do a wide range of manipulations on FRD files but I don't use a minimum phase extraction very often. Is this the main function of your spreadsheet?
No, that is just the final step in the process...
In order to design the system (drivers + crossover + cabinet) you need to know the "wide band" response of the drivers. You can't easily take a single measurement from 20Hz to 20+ kHz, so one typically takes two (low and high frequency regimes) measurements and then corrects the low frequency measurement (e.g. for baffle step) before merging all of these together to get the "wide band" 20-20k response that is needed.
When you merge two different FRD files the previous phase infois no longer valid. The phase and amplitude of a driver's response are coupled, so that one can be determined from the other. My Excel tool lets you blend amplitude information from several sources together into one file and then generate the phase response from the blended SPL data - this is known as the "minimum phase".
There are some other freeware tools that I know of that can do some or all of this, but in my experience they are not intuitive or simple to use. I am hoping that this will provide a new option for this kind of need.
-Charlie
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