FuzzMeasure

Hi Chris,

I’ve been playing around with the new harmonic distortion graphs. Great feature.

Questions :

- When an IR is normalized, the distortion graphs do not follow the signal (H1). In order to check the difference in level between H1 and the others, I presume it is the non-normalized presentation that’s good?

- I need to get a single number qualifier for distortion (or, at least, per distortion order). I realize THD is traditionaly measured out of a single frequency, but it does seem possible to get the ratio of the total level of added harmonics over the fundamental for the whole spectrum. We could use either averaged level or sum... Is this already implemented in any way in Fuzz? Anybody here knows if this is an officially developped technique for qualifiying THD?

- How about adding the level of H2 and H3 to the export data so we could play with this by ourselves on a spreadsheet?

- Any plan to add more harmonic orders?

3.1b1 (3010.2.1)
This new version of the Rev plugin adjusts the calculated Rev time according to the FFT window size. It seems to me that the default window size ends up being to short for accurate rev time calculations; you have to make it longer manually until the Rev times stop changing. Am I getting it right? Could this be automatic?

Hi,

When exporting a frequency graph’s data as txt, the file as 2 columns, the 1st being frequency and the second, dB (starting on line 2, separated with commas, using “.” as decimal).

This file can be imported as a mic calibration file by Fuzz. Is this operation going to adequately subtract the first TF from any new measurement?

In other words, what, exactly, is the format for mic cal files, and can Fuzz generate such files...?

Seeking recommendations for hardware to use FuzzMeasure with Macbook Pro -- microphones, adapters, etc. This is for audiophile home use, so I'd like to not spend $800 on a microphone.

I'd like to know what kind of algorithm is applied in 1/n-octave smoothing in frequency response graphs in FuzzMeasure?
We're using FuzzMeasure in our anechoic chamber measurements.

BR,
Jukka
Dept. of Media technology
Helsinki University of Technology

When I download the demo of FuzzMeasure I get an error that says,

"An error occured attempting to expand 'FuzzMeasure - 3.0.3.zip" Format error. Error #17540"

Which totally depresses me because A- I need this program, like, now. And B, I was planning on buying it too.

Having seen that John Atkinson of Stereophile has used FuzzMeasure for real work, I downloaded a copy. Right now, I'm just playing - using a Radio Shack Clip-on Electret Condenser mic (my RS sound level meter has been borrowed..) into a Behringer FCA202 24/96 firewire A/D into my Leoparded Mac Pro. I'm measuring the Logitech Z4 speakers hooked up to the Mac (should be lots of artefacts...)

Question is - what does the Harmonic Distortion graph actually show? I see three traces...

Hi Chris. Can you be more specific about what minimum phase copies are? The online help says : “It will minimize the phase components”. What does this mean?

I cant get fuzzmeasure to properly recognize the maudio fast trackpro. I know it is wired correctly and functioning because the application 'signal scope' will properly use it-sending sweep through output 1 and also showing the waterfall plot captured by my microphone (Behringer ecm8000). however when i go to capture settings in fuzzmeasure, 'Playback settings' shows the device as fastrack pro but the channel cannot be selected-it is blank. 'Record settings' has a drop down list for items 1,2, or 3. whatever that is. Clicking the 'configure' button on the dialog brings up the audio midi setup preferences. default input, output and system output each include two choices for fast track pro. the properties drop down list has two choices for fast track pro. not much can be changed here except the format and i set it for 44khz.

Has anyone successfully used the m-audio fast track pro with fuzzmeasure?

I'm looking for a way to splice plots in FuzzMeasure. It would be nice to take my farfield, nearfield and port measurements (if applicable) and splice them together. Maybe I've just overlooked it –which is very likely– but that's the latest feature I've found I needed recently. Overall though I've been churning out some really nice measurements with FM lately.

Hi Chris,

Since you already have EDT and T as per ISO 3382, would you consider adding C50, C80 and D50 measurements? That would be great for acousticians (or anyone with a room where intelligibility is an issue)! Maybe in the form of a plugin that could be sold separately...

Help!! Earthworks is telling me that I should not need an SPL calibrator for the M30 that they run the numbers on a Norsonic 1251. I don't want to spend the money if I don't have too. Pls advise??? Thanks, eddy z