Spectrum Analysis - Scale?
Moderator: Martin Hairer
Spectrum Analysis - Scale?
Hello
I want to analyze a sound file, but the scaling is a little awkward.
If I choose the spectrum size of 65k points (one extreme), I get a spectrum between 0 Hz and 150.000 Hz (see http://www.abload.de/img/spektrum1szy.tiff)
If choose the size of 512 points, and I zoom in in the settings, I get a spectrum between 0 and 20.000 Hz. (see http://www.abload.de/img/spektrum2ixk.tiff)
Bute I would like to zoom in further, but there is not much room for that (see http://www.abload.de/img/scaleghi.tiff)
If I take the slide to the other side, the spectrum would reach up to 200.000 Hz (see http://www.abload.de/img/spektrum3lrn.tiff) !!!
Who needs those frequencies?
How can I zoom in further?
Cheers
Babak
I want to analyze a sound file, but the scaling is a little awkward.
If I choose the spectrum size of 65k points (one extreme), I get a spectrum between 0 Hz and 150.000 Hz (see http://www.abload.de/img/spektrum1szy.tiff)
If choose the size of 512 points, and I zoom in in the settings, I get a spectrum between 0 and 20.000 Hz. (see http://www.abload.de/img/spektrum2ixk.tiff)
Bute I would like to zoom in further, but there is not much room for that (see http://www.abload.de/img/scaleghi.tiff)
If I take the slide to the other side, the spectrum would reach up to 200.000 Hz (see http://www.abload.de/img/spektrum3lrn.tiff) !!!
Who needs those frequencies?
How can I zoom in further?
Cheers
Babak
- Martin Hairer
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Spectrum Analysis - Scale?
There's something wrong there. A spectrum with 65000 points wouldIf I choose the spectrum size of 65k points (one extreme), I get a
spectrum between 0 Hz and 150.000 Hz (see http://www.abload.de/img/spektrum1szy.tiff)
never look like this. Can you reproduce this and are you absolutely
sure that you selected 65000??
Well, the spectrum is cut off at about 20'000 Hz. Anything beyond thatIf choose the size of 512 points, and I zoom in in the settings, I
get a spectrum between 0 and 20.000 Hz. (see http://www.abload.de/img/spektrum2ixk.tiff)
Bute I would like to zoom in further, but there is not much room for
that (see http://www.abload.de/img/scaleghi.tiff)
If I take the slide to the other side, the spectrum would reach up
to 200.000 Hz (see http://www.abload.de/img/spektrum3lrn.tiff) !!!
is zero. The only reason why you see it is because you choose to do
so.... There is no bug here but maybe some misinterpretation of how a
spectrum analysis works. What exactly are you trying to achieve?
Regards,
Martin
HairerSoft
http://www.hairersoft.com/
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Perhaps not a bug, but the zoom of the Spectrum window is not very intuitive to use. Once you have zoomed in, it's very hard to zoom out to a view which I - and obviously also Babak - would expect.
Possibly there's a window redraw bug...? The issue has something to do with the horizontal scroll bar and its position as well as with the size of the window. It probably shouldn't zoom out more than the highest available frequency.
Anyway, after some experimenting I guess I figured out the trick how to zoom out while getting rid of the unnecessary frequency scale...
Possibly there's a window redraw bug...? The issue has something to do with the horizontal scroll bar and its position as well as with the size of the window. It probably shouldn't zoom out more than the highest available frequency.
Anyway, after some experimenting I guess I figured out the trick how to zoom out while getting rid of the unnecessary frequency scale...
Hallo
Thanks for the replies.
What I want to achieve is to analyze, whether low frequencies are present in the sound file, especially those below 100 or 50 Hz, respectively.
I am shure, I chose 65000 in the setting.
With that setting the only correlation I see is that the frequency range besomes much large, up to some 100 kHz, as can be seen on the screen shots.
Cheers
Babak
Thanks for the replies.
What I want to achieve is to analyze, whether low frequencies are present in the sound file, especially those below 100 or 50 Hz, respectively.
I am shure, I chose 65000 in the setting.
With that setting the only correlation I see is that the frequency range besomes much large, up to some 100 kHz, as can be seen on the screen shots.
Cheers
Babak
- Martin Hairer
- Site Admin
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Spectrum Analysis - Scale?
That's bizarre. In principle, choosing a larger number of samples doesI am shure, I chose 65000 in the setting.
With that setting the only correlation I see is that the frequency
range besomes much large, up to some 100 kHz, as can be seen on the
screen shots.
improve the resolution at low frequencies, so this is what you should
be doing. Now when I use the settings shown in
http://www.hairersoft.com/Downloads/settings.png
I obtain something like what is shown in
http://www.hairersoft.com/Downloads/spec.png
Note that you can clearly see the low frequencies in this picture.
Regards,
Martin
HairerSoft
http://www.hairersoft.com/
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- Martin Hairer
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Spectrum Analysis - Scale?
Try maybe to trash the preferences file? It is located inWhat can I do here?
Library/Preferences/com.HairerSoft.AmadeusPro.plist
Regards,
Martin
HairerSoft
http://www.hairersoft.com/
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- Martin Hairer
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Spectrum Analysis - Scale?
A follow-up on this one. I think that the problem was caused by a
mistake in the German translation, this is why I couldn't reproduce it
earlier. I just updated the German locale in the archives on my
website, so if you download it again it should work now. Cheers,
Martin
HairerSoft
http://www.hairersoft.com/
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mistake in the German translation, this is why I couldn't reproduce it
earlier. I just updated the German locale in the archives on my
website, so if you download it again it should work now. Cheers,
Martin
HairerSoft
http://www.hairersoft.com/
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