[Asterisk-Users] Echo Canceller question- is there a viablesolution?

[Matthew Fredrickson]

Don't thank me, it's Mgernoth and kb1_kanobe that get the props for all 
of this.  They've been doing a lot of work to improve the software echo 
cancelers lately.

Matthew Fredrickson

On Oct 28, 2005, at 1:29 AM, gw at adcomcorp.com wrote:

> Hello Matthew,
> It is always nice to see improvements.  I look forward to testing your
> patches.
>
> It just seems that so many other hardware manufacturers have tackled 
> the
> problem, I am surprised digium has not put more research into getting
> the issue solved in software, which is possible, as opposed to coming 
> up
> with alternate solutions.
>
> Greg
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Matthew
> Fredrickson
> Sent: Thursday, October 27, 2005 1:59 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Echo Canceller question- is there a
> viablesolution?
>
>
> On Oct 27, 2005, at 12:38 AM, gw at adcomcorp.com wrote:
>> My question is, what is the direction in relation to analog boards and
>
>> such?
>
> Right now, it looks like the current fad of the asterisk group is
> hardware echo cancelation.  However, there is work that is occurring on
> the software echo cans to improve them.  In fact, I just committed
> basically an update to
> KB1
> (which was until now the latest and greatest version of MEC2) that is
> supposed to provide somewhat significant improvements.
>
>>
>> Quite a few people tend to have difficulties with echo, and although
>> the WIKI has some very helpful advice, from a business standpoint I
>> would think that it would be an important step to come up with a final
>
>> solution to the problem.
>>
>> Many companies who make the higher end equipment seem to have tackled
>> the issue on their hardware.
>>
>> Do we know if digium is spending time on solving the issue?  For
>> example, having a tool to run on a digium analog or t1 board to
>> analyze the line statistics and come up with the proper gain settings
>> could be extremely helpful.
>>
>> Such a tool would require a firm knowledge of the causes and solutions
>
>> to echo however, but I would assume that digium should have a grasp on
>
>> this.
>>
>> It just seems difficult to suggest to companies to use an asterisk
>> based solution (if they do not use pri) when there is the possibility
>> that an installation will have issues with echo.
>>
>> At this point, it feels more like a trial experience to eliminate echo
>
>> in various environments.
>
> Unfortunately, that's the way it is right now.  Getting to the point
> where you have enough knowledge to be able to work on these things is
> not an insignificant task.
> It seems like we're slowly getting there, and now that we have some 
> more
> interest on improving the software echo cans we might be a little be
> closer to getting to the point where it "just works".
>
>>
>> I have used local tone from the CO to help narrow things down, but a
>> tool that would loop dial a line and do an analysis could reduce the
>> implementation time from days to hours.
>
> Well, there isn't anything that does the "whole job" right now.
> There's a bunch
> of pieces that go together, and if you have the necessary knowledge of
> how to put the pieces together, you can get pretty close to it "just
> working".
>   It's not that
> bad though, one can also see it as job security as well :-)
>
> Matthew Fredrickson
>
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