Linux apps useful for speaker/amplifier analsys

Geek · 11th January 2006, 09:20 AM

Checkout Japa and Jaaa.

Both of these programs are fair decent FFT displays, with Jaaa being more flexible, allowing markers, more configuration, a signal/noise generator, etc.

Works with ALSA, Jack and OSS (if you have a wrapper).

Cheers!

DcibeL · 11th January 2006, 01:26 PM

I am having trouble loading the website so I'll have to try it again later. I use Baudline myself and find it to be a very nice program. It works through OSS.

anli · 20th January 2006, 12:10 AM

Also, 'ams' has pink noise generator which may be useful (especially in use with japa - last one works as 'anti-pinknoise' filter, when 'Resp' is set to 'Prop'):

http://alsamodular.sourceforge.net/

Also, you can look at 'Room EQ Wizard':

http://homepage.ntlworld.com/john.mu...meq/index.html

It is java app, but free and run under Linux.

Aha, now it is time to ask :-) Has anybody thoughts how to measure an own speaker frequency respose (something like justMLS under win32, i.e. before first reflections come to microphone)?

alinja · 20th January 2006, 08:28 AM

I have also been looking for a MLS-based measurement app. Maybe one needs to be written.

So far I have measured responses with a frequency sweep (that has pauses to mark frequency points), and analyzed it in audacity with logarithmic amplitude scale. Spectrogram view gives some idea of distortion, but nothing accurate.

anli · 7th August 2006, 09:25 PM

Probably, this app will be useful for somebody:

http://gaydenko.com/qloud/qloud-0.1.tar.bz2

It requires QT4 among others.

anli · 9th August 2006, 04:13 PM

... and QLoud screenshot:

http://gaydenko.com/qloud/shot01.png

jcx · 9th August 2006, 05:10 PM

http://scilabsoft.inria.fr/

MatLab workalike open source math software duplicates the functionality of most MatLab ToolBoxes - what real engineers use for system identification/signal processing - and has .wav i/o

for loudspeaker testing you should at least cruise Klippel's site to see what can be done

http://www.klippel.de/background/introduction.asp

anli · 9th August 2006, 05:25 PM

Quote:

Originally posted by jcx
http://scilabsoft.inria.fr/

MatLab workalike open source math software duplicates the functionality of most MatLab ToolBoxes - what real engineers use for system identification/signal processing - and has .wav i/o

for loudspeaker testing you should at least cruise Klippel's site to see what can be done

http://www.klippel.de/background/introduction.asp

There are plenty science and/or plotting apps. There isn't one ready for use for DIY-measurements. This is the only reason I was forced to try write something useful myself.

Of cource, I mean Linux/open-source world.

As for "what can be done" - I know without Klippel, there are plenty things :-)

anli · 10th August 2006, 07:50 PM

Because new versions appear, I have created tiny QLoud page:

http://gaydenko.com/qloud/

anli · 12th August 2006, 11:11 PM

Besides SPL plotting, Impulse Response power as function of time plotting is also available now:

http://gaydenko.com/qloud/screenshots/short02.png

Find last version here: http://gaydenko.com/qloud/

11th January 2006, 09:20 AM	#1
Geek diyAudio Member Join Date: Sep 2004	Linux apps useful for speaker/amplifier analsys Checkout Japa and Jaaa. Both of these programs are fair decent FFT displays, with Jaaa being more flexible, allowing markers, more configuration, a signal/noise generator, etc. Works with ALSA, Jack and OSS (if you have a wrapper). Cheers!

11th January 2006, 01:26 PM	#2
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	I am having trouble loading the website so I'll have to try it again later. I use Baudline myself and find it to be a very nice program. It works through OSS. __________________ The power of Science compels you!

7th August 2006, 09:25 PM	#5
anli diyAudio Member Join Date: Oct 2004	QLoud Probably, this app will be useful for somebody: http://gaydenko.com/qloud/qloud-0.1.tar.bz2 It requires QT4 among others.

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20th January 2006, 12:10 AM	#3
anli diyAudio Member Join Date: Oct 2004	Also, 'ams' has pink noise generator which may be useful (especially in use with japa - last one works as 'anti-pinknoise' filter, when 'Resp' is set to 'Prop'): http://alsamodular.sourceforge.net/ Also, you can look at 'Room EQ Wizard': http://homepage.ntlworld.com/john.mu...meq/index.html It is java app, but free and run under Linux. Aha, now it is time to ask :-) Has anybody thoughts how to measure an own speaker frequency respose (something like justMLS under win32, i.e. before first reflections come to microphone)?

20th January 2006, 08:28 AM	#4
alinja diyAudio Member Join Date: Dec 2005 Location: Turku	I have also been looking for a MLS-based measurement app. Maybe one needs to be written. So far I have measured responses with a frequency sweep (that has pauses to mark frequency points), and analyzed it in audacity with logarithmic amplitude scale. Spectrogram view gives some idea of distortion, but nothing accurate.

9th August 2006, 04:13 PM	#6
anli diyAudio Member Join Date: Oct 2004	... and QLoud screenshot: http://gaydenko.com/qloud/shot01.png

9th August 2006, 05:10 PM	#7
jcx diyAudio Member Join Date: Feb 2003 Location: ..	http://scilabsoft.inria.fr/ MatLab workalike open source math software duplicates the functionality of most MatLab ToolBoxes - what real engineers use for system identification/signal processing - and has .wav i/o for loudspeaker testing you should at least cruise Klippel's site to see what can be done http://www.klippel.de/background/introduction.asp

10th August 2006, 07:50 PM	#9
anli diyAudio Member Join Date: Oct 2004	Because new versions appear, I have created tiny QLoud page: http://gaydenko.com/qloud/

12th August 2006, 11:11 PM	#10
anli diyAudio Member Join Date: Oct 2004	Besides SPL plotting, Impulse Response power as function of time plotting is also available now: http://gaydenko.com/qloud/screenshots/short02.png Find last version here: http://gaydenko.com/qloud/

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