[speex-dev] regarding CELP/ACELP/others patentes

Andrew Voznytsa av at polynet.lviv.ua
Thu Apr 1 00:03:41 PST 2004

Hi All,

First of all, I'm sorry if my question is offtopic on this list. In such 
case please ignore this post and/or contact me directly. I'm asking my 
questions there because I feel you had similar problem before starting 
developing Speex.

My story:
my friend developed 3gpp content creator and he would distribute it in 
binary form.
But there is problem with AMR licensing (the terms are unacceptable for 
him). VoiceAge asked him to pay some huge amount of USD for (as they 
said) AMR license.
He contacted me to clarify situation with licensing issue. (I'm working 
in video coding area. So, please be patient if I missed something in 
audio coding).

As I understood the problem is in ACELP algorithm which AMR uses in 
6.7kbs mode. Other modes use CELP. He can disable this mode and this 
will allow him to don’t break law. Am I right?

And second question: how can I get full list of patented algorithms used 
in AMR standard? Could you point me to some resource?

Best regards,
Andrew Voznytsa

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