[Speex-dev] Notch Filter in AEC

[brant]

Hi,

   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.


	

　　　　　　　　QinBin
　　　　　　　　cola_tin at 163.com
　　　　　　　　　　2010-03-03
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