Re: [Ekiga-list] Bad frequency response with Ekiga
- From: fred k <fred k member fsf org>
- To: Ekiga mailing list <ekiga-list gnome org>
- Subject: Re: [Ekiga-list] Bad frequency response with Ekiga
- Date: Sun, 05 May 2013 11:44:19 +0900
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.
(*) 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.
--fred k
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