[Speex-dev] Notch Filter in AEC

brant cola_tin at 163.com
Tue Mar 2 23:40:24 PST 2010


   The notch filter in AEC is only used to remove DC signal, and the time of convergence is not important, right? 
If so, I think preset value of notch_radius is too small, and it causes noticeable distortion(freq < 200hz cut).
There is a picture in attachment to show signals under different radius in time-domain.
  By setting notch_radius to 0.999 for all sampling rates, I found better voice effect(distortion), while AEC still 
working fine.


        cola_tin at 163.com
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