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
FIGURE 43. C
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
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-
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
FIGURE 44. C
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.
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
CANCELLATION THROUGH ATTENUATION (VOIP
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
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
subsequently mute the microphone signal.
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 b
y 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 cancellation is configured in the Voice over IP settings (
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)
-DUPLEX ECHO CANCELLATION (VOIP
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
lt 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)
)
If the system is not able to recognise the echo from the return signal, you can choose to
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
), 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.
option) with the
)
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
lt in signal coupling, so the system stops working
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