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Re: [codec] WG Review: Internet Wideband Audio Codec (codec)

Steve Underwood <steveu@coppice.org> Mon, 11 January 2010 15:24 UTC

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Date: Mon, 11 Jan 2010 23:24:02 +0800
From: Steve Underwood <steveu@coppice.org>
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Subject: Re: [codec] WG Review: Internet Wideband Audio Codec (codec)
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On 01/11/2010 11:00 PM, Christian Hoene wrote:
> Dear Herve Taddei,
>
>    
>> Besides, I don't think you would have any trouble to propose at ITU-T some
>> new appendices to G.711 and G.722 that could fit your goals. An appendix is
>> non normative (a bit like the informative reference to G.711 PLC in iLBC).
>> By the way, if I am not wrong, some basic ITU-T G.722 PLCs are RF.
>>      
> This was my understanding, too.
>    
The G.722 spec is 23 years old, so it would be difficult for any of the 
patents on that spec to still be valid. The ITU patent database does 
list US patent 5528629 as related to G.722, but I assume this is an 
error. The patent dates from so long after G.722 came out, and its 
contents do not appear relevant to G.722. However, the recent additions 
for PLC are:

     G.722 (1988) App IV - Broadcom has claims
     G.722 Appendix III - Broadcom has claims
     G.722 Appendix IV - France Telecom has claims.

Have you seen any clear statements that those patents may be used 
royalty free?

Steve

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