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
signal.
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,
just delayed.
Yep. That's the way they usually are.
Regards,
Steve
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