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Multi-Way Conventional loudspeakers with crossovers

Linux apps useful for speaker/amplifier analsys
Linux apps useful for speaker/amplifier analsys
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Old 11th January 2006, 09:20 AM   #1
Geek is offline Geek
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Default 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!
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Old 11th January 2006, 01:26 PM   #2
DcibeL is offline DcibeL  Canada
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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.
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Old 20th January 2006, 12:10 AM   #3
anli is offline anli  Russian Federation
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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)?
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Old 20th January 2006, 08:28 AM   #4
alinja is offline alinja  Finland
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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.
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Old 7th August 2006, 09:25 PM   #5
anli is offline anli  Russian Federation
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Default 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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Old 9th August 2006, 04:13 PM   #6
anli is offline anli  Russian Federation
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... and QLoud screenshot:

http://gaydenko.com/qloud/shot01.png
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Old 9th August 2006, 05:10 PM   #7
jcx is offline jcx  United States
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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
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Old 9th August 2006, 05:25 PM   #8
anli is offline anli  Russian Federation
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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 :-)
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Old 10th August 2006, 07:50 PM   #9
anli is offline anli  Russian Federation
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Because new versions appear, I have created tiny QLoud page:

http://gaydenko.com/qloud/
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Old 12th August 2006, 11:11 PM   #10
anli is offline anli  Russian Federation
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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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