On 04/09/2014 06:54 PM, Tzafrir Cohen wrote:
On Wed, Apr 09, 2014 at 10:19:59AM +0800, Steve Underwood wrote:
Hi Jeff,
On 04/08/2014 12:13 PM, Jeff Brower wrote:
Darrel- The G729 essential patents were *granted* in 1996, but
applied for prior to June 8 1995. That means their lifespan is
either 20 years from their application date, or 17 years from
their grant date, whichever is greater
(http://www.uspto.gov/main/faq/p120013.htm). Either way, they
expire in 2014. -Jeff
Where did you get the cutoff date of June 8 1995, and how does 20
years from that date lead to the last of the patents expiring in
2014? Nobody uses G.729. They use G.729A. The G.729A spec is
somewhat later than the original G.729, but I don't know if there
are any additional patents which specifically relate to Annex A. You
could use G.729 instead, but it roughly doubles the compute needed.
If it allows me to avoid the trolls: I'll pay that performance hit. In
many caces there are CPU cycles to spare. But the licensing is a hard
limit.
Well, you do get the benefit of higher quality for your extra compute.
G.729 sounds distinctly better than G.729A on a lot of material.
There are various things on the web saying the last of the patents
on G.723.1, which was around in draft form long before G.729,
expires in 2014. However, there seem to be patents related to that
codec which don't really expire until some time in 2015. Its really
hard to find solid information. The ITU patent database rarely
identifies the actual patents being claimed, so its damned hard to
look them up.
Nice.
Regards,
Steve
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