Robert Hajime Lanning wrote:
<quote who="Eric Bishop">
Just out of interest,
When echo occurs (the type where I hear myself echoing as I talk) what
is bouncing against. Is it the other caller's equipment, the central
office or something in between?
When you are talking via 4 wire or VoIP phones there is a seperate
outbound audio channel and inbound audio channel, niether the twain
shall meet.... no echo
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.
Regards,
Steve
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