Re: CA Digital Certificate

On 7/14/26 1:56 AM, Porter, Josef D via Sox-users wrote:
> Hello,
> 
> I work for the National Park Service and the Department of the Interior 
> has updated its policies on accessing certain software/applications that 
> are not provided through our "Company Portal" and SoX is one of those 
> applications. We use the application, along with RStudio, to produce 
> spectrograms of potential owl calls collected on autonomous recording 
> units. Apparently, the certificate expired last year and because of that 
> and the new policy, DOI/NPS cannot download the software application 
> without a valid "CA digital certificate" signed by the software 
> developer. I was just wondering if anyone knows who I could contact from 
> Sound Exchange to obtain this certificate?

If you mean the certificates used to validate https: transfers, those 
seem to be OK at the moment for https://sox.sourceforge.net
if you mean some other form of certification, mail me privately to this 
address and I can digitally sign a source tarball or something if that's 
what you need.

There is now also https://codeberg.org/sox_ng/sox_ng which is the 
actively maintained fork of SoX as sox.sf.net since May 2024 and fixes 
all known CVEs in 14.4.2 as well as many bug fixes and some new 
features, including many improvements to the spectrogram effect
though it still sometimes gives truncated spectrograms missing the 
rightmost few columns and the last label of the time axis.

For creating spectrograms, there is 
https://codeberg.org/martinwguy/spettro which is far superior, 
configurable and accurate than sox spectrogram. It's normally 
interactive, giving a scrolling spectrogram as the sound plays, but has 
a -o dump-to-file option.
In particular, you can adjust the size of the FFT window, which lets you 
optimise the precision of the graph in the time and frequency 
directions, which should improve your vision of the owl calls.

By chance, I happen to have analysed the calls of the Common Swift, 
which appears to be able to frequency-modulate it's voice at about 500Hz
https://martinwguy.blogspot.com/2019/02/polyphony-in-common-swift-calls.html

    M