[Speex-dev] AEC Patented ?
Jean-Christophe.Berge at etu.enseeiht.fr
Jean-Christophe.Berge at etu.enseeiht.fr
Tue Oct 3 07:53:39 PDT 2006
Hello Jean-Marc Valin and all the Speex-dev team,
Today I have a little question about patents and the AEC.
I' am not a lawyer, but after a deep research in esp at cenet.com,
I found that in August 2003, an AEC called "Double talk insensitive NLMS
algorithm" (DNLMS) have been patented by Gary Q Jin, Gordon J Reesor, and
others (US 6.608.897 B1).
It uses a continuous adaptation step as speex, to avoid adaptatif filter
divergence during double-talk.
Is the computation method really the same as speex AEC (hope not) ?
Somebody who have a deep understanding of Speex AEC algorithm might have a
look at this patent ?
Thank you in advance for your answer,
Sincerly
Jean-Christophe
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