Spectral Analysis

  • Thread starter Thread starter Tonio
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T

Tonio

New member
I have a thread here https://homerecording.com/bbs/showthread.php?t=122222
that no one really commented on the best way to do a spectral analysis.

Is it just because I'm on a MAC, me thinks not.

So can anyone say for sure if its better to use a sine wave or pink noise sweep for the test? Or can someone give me a link to resources regarding this
process?

Steve(Knighfly), Ethan, anyone??
The tests I did and posted graphs are sine waves, I do have pink noise sweeps done also. Would that be better?
do I need to give more info of the room etc??
I've been to other boards, and there isn't really an answer to my inquiry. Is it just voodoo, and the process is not fully understood?

Thanks

T
 
http://www.recording.org/postt19286.html

Then

http://forum.studiotips.com/viewforum.php?f=1&sid=136b76a0ef7315a1b13a6b1f7161ba28

There are a couple of threads at the second link dealing with ETF - although you're using spectra foo, there should be some help at these threads as far as methods go - I've not yet bought such a program, probably will get ETF in the next few months -

BTW, "lovecow" and "savant" are both handles for Jeff szymanski of Auralex - I would take his word over almost anyone else's on the net, in case you find a conflict.

Hope that helped... Steve
 
Steve,
Thank you for the links, I'll check it out. Yes I am aware of Jeff's alias'.
I did try over at studiotips, butdidn't get much response guess I'm too newbie there.

s'pose you're more into the construction side of things eh?

T
 
Tonio,

> can anyone say for sure if its better to use a sine wave or pink noise sweep for the test? <

You didn't say so, but I assume you're asking about room response measurement?

It doesn't matter if you use pink noise or swept or static sine waves. What does matter is the resolution to which the readings are made, at least for low frequencies which are always the biggest problem. Standard 1/3 octave tests are wholly inadequate for assessing the low frequency response in a room. I've written about this extensively in web forums, and summarized it in my recent article in the April 2004 Electronic Musician magazine. If you don't get EM, that article is now on the Articles page of my company's web site, linked under my name below.

Personally, I have used sine waves played at 1 Hz increments, and also the ETF software from www.acoustisoft.com. Both give a good representation of the low frequency response in a room, but ETF takes five seconds to give a readout, versus about an hour to play sine waves and plot the result.

--Ethan
 
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