Free software for fft signal analyses.
Free software for fft signal analyses.
(OP)
Hi
I have just starting out trying to teach myself signal analysis stuff and I am interested to know if people use any free signal analysis software in real life? I have looked at excel fft functions (limited to 4096 data points) but does anybody use www.scipy.org or dataplot http://www.itl.nist.gov/div898/software/dataplot/ or gnu plot (only a front end plotting package) or other public domain software to do signal analysis of mechanical systems?
Russell
I have just starting out trying to teach myself signal analysis stuff and I am interested to know if people use any free signal analysis software in real life? I have looked at excel fft functions (limited to 4096 data points) but does anybody use www.scipy.org or dataplot http://www.itl.nist.gov/div898/software/dataplot/ or gnu plot (only a front end plotting package) or other public domain software to do signal analysis of mechanical systems?
Russell





RE: Free software for fft signal analyses.
RE: Free software for fft signal analyses.
If you're using Linux, octave comes bundled with most (if not all) distributions.
RE: Free software for fft signal analyses.
TTFN
RE: Free software for fft signal analyses.
RE: Free software for fft signal analyses.
RE: Free software for fft signal analyses.
Cheers
Greg Locock
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RE: Free software for fft signal analyses.
1) Longevity on this scale implies that it must be OK.
2) These routines are very efficient with both speed and memory because they were designed to be programmed with punched cards and stored on magnetic tape!
M
--
Dr Michael F Platten
RE: Free software for fft signal analyses.
I have posted the source code for an FFT program at:
http://www.vibrationdata.com/fft.cpp
Also refer to:
ht
Whichever FFT program that you use, make sure that you understand the convention, as well as the error sources and limitations of the FFT.
Tom Irvine
www.vibrationdata.com
RE: Free software for fft signal analyses.
Thanks a lot for sharing your code and for the info. I have had a bit of a play with the different Matlab clones and even had a brief look at the r statistical language as that has an fft function. I know that excel has an fft function but that is limited to 4096 samples and I have played around with that a bit. However I was very interested with all the development around the python langue and its use in scientific computing and the attempts to make it more Matlab like. It seems industrial strength to me and there also seems there is quite a bit of support and it can run on many different platforms. I just wondered if anyone was using it “for real”. Here are the links in case anyone wants to have a look.
http://www.scipy.org/
http://matplotlib.sourceforge.net/
http://ipython.scipy.org/
http://www.enthought.com/index.htm
RE: Free software for fft signal analyses.
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RE: Free software for fft signal analyses.
RE: Free software for fft signal analyses.
Excel was never meant to be used for general time series analysis (remember, it's a spreadsheet program). However, if you take a stroll through an average engineering anaysis department you'll see many instances of engineers forcing all their analyses through Excel, regardless of its suitability. A classic case of "When all you have is a hammer, everything starts to look like a nail".
I know I mentioned "octave" earlier, but in general, any command-line driven maths program with scripting capability and decent interactive plotting is all you need to learn DSP.
RE: Free software for fft signal analyses.
Might have to look around a bit, but I think you can still find the freeware versions on the internet.