Appendix
Commend SIP Series
62
2.0/0612
Appendix
Basic Knowledge about Audio Configuration
In order to carry out a proper audio configuration with the tab
Audio
(
see page 45
), basic knowledge
is recommended.
In the following section the various settings and the resulting consequences are explained.
Echo Cancelling according to LS / Mic / Room
“Echo Cancelling” or “Echo Suppression” are methods used to suppress or remove echo or hall effects
at simultaneous sending and receiving of signals (full duplex).
For example, the voice out of the loudspeaker of a hands-free speaking system (e.g. SIP station) during
hands-free speech is picked up by the microphone and transmitted back. Therefore the subscriber on
the other end hears his own voice as an echo.
The following factors determine which
“Echo Suppression”
-level (
see page 45
) is required, to sup-
press
Echo
on the opposite side:
Configured
volume level
of the loudspeaker (
)
Configured
microphone sensitivity
(
)
Properties of the
Room
(size, angles, materials, furnishing
)
Distance of the speaker
to the station (and therefore the microphone of the station
)
Effect of the Configuration always at the other Station/Device
Important information for echo cancelling configuration:
Settings for microphone sensitivity, echo- and noise suppression at the station have direct effects to
the acoustic behaviour
at the called station
.
Therefore if echo is audible at a device (Intercom, telephone) the configuration needs to be carried
out at the
conversation partner
!
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