Help on making MULTIRESOLUTION WAVELET ANALYSIS available ?

[mige0]

Anybody out there to help unveil secrets of wavelet analysis – and possibly to develop towards moduls / scripts or a front end – stupid monkey like me can handle ?

Background are Elias' breathtaking and challenging visualisations regarding "quarter wave honk" here (and subsequent):


Horn Honk $$ WANTED $$





So to get things started - I think I contribute as far as a I can - not *that* much anyway..
Software - more or less a Matlab clone I've been told - can be downloaded for free (~ 60MB):


http://www.gnu.org/software/octave/
http://www.gnu.org/software/octave/download.html/


Setup is straight (I didn't make any changes)


Then I was looking for a entry in the "program folder" and as this did not show up I manually launched "octave-3.2.3.exe" from the subfolder "bin" (happily found it there after some sarch )

Expectations at first start up were high - but reality popping up is a thumb black box with a few lines of text followed by a prompt – ufff

What's that ???

Looking for help I searched the web and came up with the (proudly announced !) 500+ pages manual – ufffffff !!!


http://www.gnu.org/software/octave/doc/interpreter/


Skipping the first entries and especially the "How You Can Contribute to Octave" as I'm considering my hard work here already as my 2ct – I finally arrived at "simple examples", kinda tutorial:


http://www.gnu.org/software/octave/d...imple-Examples.


Lacy as I am, I wanted to hurry through by copy and paste commands - joyfully watching pretty pictures popping up or anything – no way – have to type character by character into that stupid black box - uffffffffff

Getting the first matrix at least displayed, already is kind a climax – well you have to adapt your expectations – no?








... to be continued ...

need a break now ..

possibly better don't hold your breath ..



Michael

[jcx]

I've used SciLab as a free MatLab work-alike

Home - Scilab WebSite

[mige0]

hi

Wow - that looks interesting too - seems to have an easier user interface - I'm just downloading to give it a closer look

Seems there is wavelet analysis available for SciLab too:

Scilab Wavelet Toolbox

Have you used it ?


#############
BTW

*proudly* present:
(My first plot)



what the hack do that traces tell me ?? - anyway - I LOOOVE pretty pictures...


AND such a beautiful white background ! AND you can scale it ! AND you have cursor readout ! whoooaaa !!!

Michael

[mige0]

SciLab on my PC was a disaster –
- needed additional download at installation
- installed some openoffice math package ??
- didn't make it past three or four demo examples
- got stuck and crashed all
- de - installed

###########

found graphic user interface for Octave here:

Xoctave : GNU Octave Interface - About Xoctave

Looks good at a first glance though is label "last beta version"





allows for copy and past through clip board into command area...

Michael

[mige0]

Originally Posted by mige0

what the hack do that traces tell me ?? -

mio stupido !
Below already looks way more like audio:

[mige0]

Might be I should outline that I'm highly motivated to use wavelet analysis rather then Fourier analysis.
This is due to the fact that when investigating into reflections and subsequent comb filtering effects, the time invariance Fourier analysis relays on - exactly in the interval we are most interested in for those "quarter wave honk" – simply is not a given.





Horn Honk $$ WANTED $$


######

Back to track...

Being not only a monkey but being a lazy monkey at first – I got bored by that much "button pressing" soon.

So I started to have a look after automation
– great – those guys provide scripting option !!

Below the first lines (for download) to make life easier...
Over the course, 'will need a lot more of that trick I'm afraid


http://www.kinotechnik.edis.at/pages...tart_wavelet.m


first call by "start_wavelet"
and importing IR file (plus providing the plot seen above to check function) by calling "load_ir"

...well, only if you have set up anything else properly of course



Michael

[mige0]

After having made first stumbling steps in an unfamiliar environment lets have a look at how to climb the next hurdle

Sadly Octave does not provide wavelet analysis – but as its reported to be pretty similar to Mathcad those clever guys that coded the wavelet package (named "WaveLab") for Matlab assume that this package also may work in Octave as can be read here and at subsequent pages:

WaveLab802


Free download is available and installation was straight – if you do not care about the time and effort to include a heavy bunch of path's to include in XOctave.



So – now finally arrived in the middle of that "desert of math" – a few examples of "how to" for the noob would be highly welcome....



Michael

[mige0]

Had a look into free UviWave 300 wavelet toolbox in the mean time.

http://cas.ensmp.fr/~chaplais/UviWav...t_UviWave.html


After a lot of debugging (matlab <> Octave and version conflicts as it seems) and additional necessary installation of free plplot package

http://plplot.sourceforge.net/download.php

- I finally got some of the UviWave demos running under XOctave.

Sadly the most stuff there is for picture processing and only very few functions seem to be for audio processing.
Those demos I had a look into didn't look that much promising either.

Bottom line – a lot of wasted time IMO...




Michael

[mige0]

Also gave the WaveLab package, mentioned earlier, a try .
They seem to concentrate on picture processing as well .

Also for many of the WaveLab functions to work, there seems to be a special "signal processing toolbox" required (if I shall believe, what's popping up as an error message) - which I think isn't available nor is substitutable by freeware IMO.

Bottom line – here too - no free lunch for audio guys...



Michael

[mige0]

Just for the record :

Commercial Clio software:

http://www.audiomatica.com/clio/8wavelet.htm

Originally Posted by ZilchLab

I am currently upgrading to 8.5.

[If wavelets were in 7.x, I never stumbled upon them in 5 years of using it.... ]

Originally Posted by mige0

Zilch, those Clio guys seem to be quick - when did they release the wavelet version?
Sadly, software is way too expensive for my taste, and also no demo available as it seems - would love to see you posting some wavelet plots though

Michael

##########


Free FaWave software :

Originally Posted by Jmmlc

Hello,

A friend indicated me that freeware:

FAWAVE

according to the website:

"FAWAVE is free software for performing digital signal processing on digital audio and images. It also can be used to teach the fundamentals of Fourier and wavelet analysis. "

Best regards from Paris, France

Jean-Michel Le Cléac'h

Originally Posted by mige0

Did you get anything meaningful - regarding our topic - out of this software ?

Seems this one has more strength at picture processing - havn't made it towards something interesting - but maybe I have overlooked ??

Michael

Originally Posted by Jmmlc

Hello Michael,

I gave a look yesterday evening and find this freeware totally unsatisfactory for our purposes (analysis of pulse responses). Better to forget it...

Best regards from Paris, France

Jean-Michel Le Cléac'h

Michael