problem with "show spectra"

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problem with "show spectra"

Permanent link to this post Posted by pesa » Thu Sep 14, 2017 11:56 am

Hi
I use audacity 2,1,3 to analyze single tones from recorders (I build them)
I have very good use for that function in audacity,thanks!
However,there is a behaviour thats strange,it seems the "peak" information is generated by analyzing the plot, not from the underlying data.
An easy way to verify this is to stretch the spectrum window,now local max will not show the same result.
Why is that? For me the difference is big enough to render it useless in some cases. I'm interested in the decibel-value of the first and second overtone compared to the fundamental tone. That difference can easily be 10db or more depending on the with of the spectrum window. (I'm talking about screen with of the actual window.)

Is there any work around?

I use windows10 and the settings in the spectra I use hanning window. Usually size 32768.
I include a sample that has fundamental tone at 413 (a in low pitch).

pelle
Attachments
sound sample.wav
(176.41 KiB) Downloaded 8 times
pesa
 
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Re: problem with "show spectra"

Permanent link to this post Posted by steve » Wed Oct 04, 2017 3:49 pm

You can access the underlying data using the "Export" option (http://manual.audacityteam.org/man/plot_spectrum.html)
The data could then be displayed in any graph application of your choice.
For critical work, I have sometimes used the Plot Spectrum data with GnuPlot http://www.gnuplot.info/
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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Re: problem with "show spectra"

Permanent link to this post Posted by bigboyscartoys » Tue Oct 10, 2017 9:29 am

ok i understand now
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