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...t 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: notch.jpg Type: image/jpeg Size: 47929 bytes Desc: not available Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20100303/11c19fe1/attachment-0001.jpg

...re 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 >> >> >> >> _______________________________________________ >> Speex-dev mailing list >> Speex-dev at xiph.org >> http://lists.xiph.org/mailman/listinfo/speex-dev = = = = = = = = = = = = = = = = = = = = ?...

...00hz 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 > > > > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev

Hi Jean-Marc, You make that sound like its just a matter of meeting some arbitrary spec. Let's be more specific..... If you use narrow band voice down to deep bass frequencies: - 16 bit linear audio sounds good - alaw or ulaw sounds muddy - low bit rate codecs, like speex or G.729, sound awful. I assume QinBin only listened to some uncompressed audio in his evaluation.