[linux-audio-user] log sine sweeps

Richard hebertrich at earthlink.net
Fri Apr 23 18:08:15 EDT 2004

On a different note.

Log sine sweeps..  
Yes and no.. it's all depending on too many factors to tell you 
like this.
First off.. if you were to check  ex  1 2 5  10 20 50 100 200 500 
you're leaving too much space in your measurements.. you will 
loose a lot of the details you need to take a good hard look at.
Generally i use a noise source that contains everything and took 
snapshots of the screen for future reference.
Whether for a large sound system in a hall etc..  or for studios
we generally do it using a noise generator and a calibrated
high performance microphone.

Again .. acting in real time and taking action while you're 
looking at the screen (  setting filters  delays  etc ) is the 
conventional way.You're talking studio.. but  then again .. depending 
on what you see. you may not want at all to treat the signal .. but to 
treat the room in itself.

Ex .. Using bass traps .. they can be tubes.. they can be cavities 
within the walls  etc etc

Big huge problems with the room have to be corrected for what it is .
The room is at fault.. fix the room  :) 
It's a complex mix.. there's tons of opinions out there 
and they all have ins and outs.

You will have to make experimentation and find what's best
for your particular application.

This being said.. pizza calls :) 


(  the smiley guy ;) 

On Fri, 23 Apr 2004 22:19:03 +0200
mrtn <martin at nadir.org> wrote:

> hello,
> i am trying to record impulse responses from
> my studioequipment to correct it's phase and freq responses
> with e.g. DRC and bruteFIR.
> I heard the best idea would be to take log sine sweeps
> for the measuring?
> it would be great if someone more experienced than me
> knows of a good method to create sweeps (or chirps) of equal 
> freq.response with linux software?!
> or maybe some other tips and tricks about audio impulse response 
> measuring with linux?
> peace
> mart

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