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

Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca> Mon, 11 January 2010 15:33 UTC

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Date: Mon, 11 Jan 2010 10:32:53 -0500
From: Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>
To: Steve Underwood <steveu@coppice.org>
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Subject: Re: [codec] WG Review: Internet Wideband Audio Codec (codec)
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Hi,

Regardless of the exact status of the PLC IPR, I don't think it would be a good
idea to just say that "the Internet should just follow ITU-T standards with a
20-year lag". As it has been already shown with the codec proposals received to
date, it should be possible to create RF codecs that are *much* better than
G.722 and G.711.

   Jean-Marc

Quoting Steve Underwood <steveu@coppice.org>:

> 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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