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Configuring the echo cancellation function, Adjusting echo cancellation parameters – H3C Technologies H3C MSR 5600 User Manual

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the echo cancellation delay (the time between when an interface sends out a signal and when to the

interface receives an echo) to 33 ms and the echo cancellation coverage to 16 ms.

Figure 8 Echo

Configuring the echo cancellation function

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter voice interface view.

subscriber-line line-number N/A

3.

Enable the echo cancellation

function.

echo-canceler enable

By default, this function is enabled.

4.

Configure the echo
cancellation delay.

echo-canceler delay milliseconds

The default is 0 milliseconds.

5.

Configure the echo
cancellation coverage.

echo-canceler tail-length
milliseconds

The default is 128 milliseconds.

Adjusting echo cancellation parameters

Table 1

describes how to adjust echo cancellation parameters for different symptoms.

Table 1 Adjusting echo cancellation parameters

Symptom Parameters

adjusted

Effect

A user hears echoes or loud
background noises from the peer
when speaking.

Speed up the convergence of
comfortable noise amplitudes.

Too fast convergence might make
noises uncomfortable.

There are loud environment noises.

Increase the maximum amplitude
of comfortable noises.

Too large amplitude might make
noises uncomfortable.

A user hears echoes when
speaking.

Enlarge the mixture proportion
control factor of comfortable

noises.

Too high a control factor leads to
audio discontinuity.

There are echoes when both
parties speak at the same time.

Enlarge the two-way judgment
threshold.

Too high a judgment threshold
slows down the convergence of the

filter factor.

To adjust echo cancellation parameters:

Step Command

Remarks

1.

Enter system view.

system-view

N/A