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Configuration Guide. IPefono.
5.6.2.2 Echo cancellation through attenuation
Echo cancellation through attenuation is configured in the Voice over IP settings (“VoIP” option)
with the following values:
Echo canceller algorithm in a regular communication
Higher output level to cut the microphone input off
Echo canceller filter factor
Echo canceller attenuation for the attenuate scheme
F
IGURE
43. C
ONFIGURATION OF ECHO
If the system is not able to recognise the echo from the return signal, you can choose to
attenuate what is heard while you speak, to minimise the uncomfortab
yourself while you speak. There are two reasons for attenuating it and not completely
eliminating it. On the one hand, you can tell if the speaker on the other end is talking at the
same time as you and, on the other, you can check if
what it is emitting and you can hear what is being said.
You need to change three settings in this mode.
microphone input off” (
4000 ) indicates the level from which the IPefono interprets
emitted by the speaker and will
values, from lowest to highest (2000 to 8000).
The second parameter, “Echo canceller filter
continue to cut off the microphone signal after determining that a voice is no longer being
emitted. This setting is designed to prevent “mini
sentence, but it should also be sufficiently low to switch to normal mode when he/she has
finished speaking. Setting it to 8 normally has good results.
The final one is the echo attenuation factor, “
(
16 ), which indicates the value b
will depend directly on the volume that has been set and the acoustics that you have.
5.6.2.3 Half-duplex echo cancellation
Half–duplex cancellation is configured in the Voice over IP settings (
following values:
Echo canceller algorithm in a regular communication
Higher output level to cut the microphone input off
Echo canceller filter factor
Echo canceller attenuation for the attenuate scheme
F
IGURE
44. C
ONFIGURATION OF HALF
There are extreme cases where cancellation through attenuation is not enough and you simply
want to completely eliminate the return signal during speaking.
IP gateway is used to an analogue telephone, there is a closed loop in the audio signal.
telephone line, as indicated above, has an echo on it, and you also have
microphone-speaker set. This can resu
altogether. If this is the case, you need to work in this mode.
. V2.8
Echo cancellation through attenuation
Echo cancellation through attenuation is configured in the Voice over IP settings (“VoIP” option)
Echo canceller algorithm in a regular communication
attenuate
Higher output level to cut the microphone input off 4000
8
Echo canceller attenuation for the attenuate scheme 16
ONFIGURATION OF ECHO CANCELLATION THROUGH ATTENUATION
(V
O
IP
OPTION
If the system is not able to recognise the echo from the return signal, you can choose to
attenuate what is heard while you speak, to minimise the uncomfortable effect of hearing
There are two reasons for attenuating it and not completely
eliminating it. On the one hand, you can tell if the speaker on the other end is talking at the
same time as you and, on the other, you can check if the remote system is working properly,
what it is emitting and you can hear what is being said.
You need to change three settings in this mode. The first, “Higher output level to cut the
) indicates the level from which the IPefono interprets
will subsequently mute the microphone signal. You should test the
values, from lowest to highest (2000 to 8000).
The second parameter, “Echo canceller filter factor” ( 8 ), indicates how long the intercom will
continue to cut off the microphone signal after determining that a voice is no longer being
This setting is designed to prevent “mini-outages” while the speaker is saying a
also be sufficiently low to switch to normal mode when he/she has
Setting it to 8 normally has good results.
The final one is the echo attenuation factor, “ canceller attenuation for the attenuate scheme
), which indicates the value by which the return signal is divided while the speaker talks.
will depend directly on the volume that has been set and the acoustics that you have.
duplex echo cancellation
duplex cancellation is configured in the Voice over IP settings ( “VoIP”
Echo canceller algorithm in a regular communication mute
Higher output level to cut the microphone input off 4000
8
Echo canceller attenuation for the attenuate scheme (not used)
ONFIGURATION OF HALF
-
DUPLEX ECHO CANCELLATION
(V
O
IP
OPTION
There are extreme cases where cancellation through attenuation is not enough and you simply
want to completely eliminate the return signal during speaking. For example, when a Voice over
IP gateway is used to an analogue telephone, there is a closed loop in the audio signal.
telephone line, as indicated above, has an echo on it, and you also have a closed loop in the
This can result in signal coupling, so the system stops working
If this is the case, you need to work in this mode.
5 – Configuration
39
Echo cancellation through attenuation is configured in the Voice over IP settings (“VoIP” option)
OPTION
)
If the system is not able to recognise the echo from the return signal, you can choose to
le effect of hearing
There are two reasons for attenuating it and not completely
eliminating it. On the one hand, you can tell if the speaker on the other end is talking at the
the remote system is working properly,
The first, “Higher output level to cut the
) indicates the level from which the IPefono interprets that is being
You should test the
), indicates how long the intercom will
continue to cut off the microphone signal after determining that a voice is no longer being
outages” while the speaker is saying a
also be sufficiently low to switch to normal mode when he/she has
canceller attenuation for the attenuate scheme ”
y which the return signal is divided while the speaker talks. It
will depend directly on the volume that has been set and the acoustics that you have.
“VoIP” option) with the
OPTION
)
There are extreme cases where cancellation through attenuation is not enough and you simply
For example, when a Voice over
IP gateway is used to an analogue telephone, there is a closed loop in the audio signal. The
a closed loop in the
lt in signal coupling, so the system stops working