*fred k* wrote:
Using Ekiga v.3.9.90 ... You can see it here:
http://pix.toile-libre.org/?img=1367698438.png
My observation:
When you (or Ekiga, or the sound card) took samples at 8 kHz and transmit
two-sample running average(*) off the stream, you'll get
0.7 dB down at 1 kHz
3.0 dB down at 2 kHz
8.3 dB down at 3 kHz
12.6 dB down at 3.4kHz
Fairly close to 1367698438.png but not exact.
Attractive hypothesis! Only developpers know if samples are averaged this way.
(*) a+b, b+c, c+d, ... where samples are a,b,c,d,...
Another possibility is down-sampling from 44.1kHz sound card but I have no idea
how it works.
The "white noise" whas generated at 8000 samples per second in the same way
during the two conversations.
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