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Old December 29th 05, 08:16 AM posted to rec.radio.shortwave
 
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Default unusual data signal at 15937.5 kHz

I hadn't realized it, but soundforge rev 6 has a spectrogram feature.
I'm pretty sure that rev 6 is old, but the good news is Sony bought the
company the software is considerably cheaper.

I don't believe there is anyway to change the size of the FFT.
However, I changed the scale and color scheme to do a decent job on the
data.

http://www.sonymediasoftware.com/pro...orgefamily.asp

According to the list, you need to get the full version for spectral
analysis. At this point in time, it's probably not worth it unless you
can find an old rev. There is plenty of open source audio software.


Ron Baker, Pluralitas! wrote:
wrote in message
oups.com...
http://www.lazygranch.com/images/temp/7fsk.gif

When I just displayed the power spectrum, it looked like 8, but in the
spectrogram, it does look like 7.


Interesting. What program did you use to produced that spectrogram?
I use Digipan for live monitoring and Matlab for analysis.
I use gram sometimes too. It has some nice features but
also some peculiarities.

Does it let you adjust the FFT size.
A shorter FFT gives better time resolution at the
expense of frequency resolution.
A longer FFT gives better frequency resolution at
the expense of time resolution.
But you probably knew that already.

--
rb