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7.7.3.11
Signal Processing
In the Signal Processing submenu, all parameters are listed which ensure an
optimal Audio quality of the caller.
FIG. 58
After pressing the OK button, all settings are accepted.
The Cancel key deletes all settings.
7.7.3.11.1
Line Settings AGC and Echo canceller
All available lines are displayed in the Line settings list. For each line, an AGC
(Automatic Gain Control) as well as an Echo Canceller can be turned on or off
separately.
An echo canceller suppresses the so called line echo. It arises when the caller
uses an analogue telephone. When using digital telephones (ISDN or mobile
telephone) no line echo can arise. Since the line echo canceller would down-
grade the calling signal of digital telephones, it is necessary to check at the be-
ginning of a connection whether or not an analogue or a digital telephone is
used. For this purpose a short test signal is transmitted when establishing the
connection. On the basis of the received echo, it will be decided wether the
line echo canceller will be activated or not.
Select the desired line and press then the Edit button. Switch the AGC and/or
the Echo Canceller ON or off. Turning the Echo canceller on first causes a test
signal to be transmitted when establishing the connection (see Info box).
Whether or not the Echo canceller will be activated depends on the received
Echo and is done automatically.
M A G I C
SETTINGS FOR THE DIGITAL SIGNAL PROCESSING
T O U C H
S o f t w a r e
P A G E 8 9
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