On Mon, 2006-02-06 at 04:01 -0800, [EMAIL PROTECTED] wrote: > On Mon, 6 Feb 2006, trixter aka Bret McDanel wrote: > > Again, I know Sangoma is a sore subject with some on this list, but the > > echo cancelation stuff I heard while presented by a Sangoma employee was > > not Sangoma specific, although it did include some research into > > different hardware/software based cancelers. > > digium licenses g729 codec, wonder if digium could license a good > G.168 echo canceller from someone.
They can license anything that is on the market, the catch is whether it would be cost effective to do that. I also remember what the sangoma guy was talking about a little more now. It had to do with the ticks, hardware cancelers typically have a much higher amount becuase they are specialized to do that. As such they can do more processing. The second echo that he talked about was muted but present and out of the range of most software based echo cancelers. He said that their results were that software echo cancelation was about 30MHz per channel. Now he didnt quantify what cpu that was, 30MHz on a 486 is far different from 30MHz off a Xeon, as such I personally dont like such arbitrary numbers, but be that as it may be did say that intel rated the G.729 codec at about the same 30MHz per channel, which I would assume was based on the same series cpu. If that is true that gives you some scope of how much cpu you need, and why it may be better to do echo cancelation in hardware vs software. As I said earlier I missed the whole presentation, but do notthink he compared different vendors hardware echo cancelers, there are certainly good ones and bad ones, without some real data on each its hard to say ... -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378 http://www.sacaug.org/ Sacramento Asterisk Users Group
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