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Re: VLF: 8819.9 Hz in Virginia?

To: [email protected]
Subject: Re: VLF: 8819.9 Hz in Virginia?
From: wolf_dl4yhf <[email protected]>
Date: Fri, 12 Dec 2014 20:25:40 +0100
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Hello Jim,

you asked:

> Can I inspect previously captured Spectrum Lab data at higher resolution by accessing a data file, or perhaps by opening a new waterfall-display window?
Only if you logged the input ("audio") as file, *.wav or *.ogg.
From the spectra which may still reside in SL's "scroll-back" buffer it's impossible to re-calculate an FFT with more resolution because the data in that buffer are -by *default*- only amplitude spectra which cannot be converted back from short-time Fourier transforms into the time domain.
So, in short: Use SL's audio logging feature to capture the raw (or,
maybe, slightly compressed) data.
Can be activated as shown in the manual... from the main menu:
"File".."Audio Files and Streams"..."Save input as audio file".
Then, we can do all kinds of post-processing on the time domain data.

Cheers,
  Wolf .



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