[Asterisk-Users] Why echo occurs
steveu at coppice.org
Sat Feb 12 02:51:21 MST 2005
Robert Hajime Lanning wrote:
><quote who="Steve Underwood">
>>Wrong. Look at any cellular phone or IP phone. They all have echo
>>cancellers. If you switch these cancellers off the results are
>>generally bad. What they need to remove is the acoustic spill
>>from the earpiece to the mike. This can be a surprisingly strong
>While acoustic "spill" can be an issue, I do not believe it is
>the primary source of 90% of the echo experienced.
>I do not know of any IP phone that contains an echo canceler other
>than speaker phones.
Can you show me an ad for an IP phone which doesn't say it includes an
echo canceller? A real phone, I mean. Not some thrown together half
baked softphone, many of which do a very poor job.
>Find a situation where you think the echo is acoustic spill, then
>try it with a hands free head set.
Sounds like you haven't worked with this very much.
>If you notice, the echo is a repeat once type of echo. Not the
>fading echo of a loop, that acoustic spill would cause.
Who introduced a loop into the discussion?
>All the echo that I have been talking about, you hear yourself once,
Yep. That's the way they usually are.
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