Configuring Gain Adjustment Function - HP FlexNetwork MSR Series Configuration Manual

Symptom
A user hears echoes when
speaking.
There are echoes when both
parties speak at the same time.
3. Enable the nonlinear function of echo cancellation
The nonlinear function of echo cancellation, also known as residual echo suppression, means
the removal of residual echoes after echo cancellation when the user at the local end does not
speak.
Configuration procedure
To configure the echo adjustment function:
Step
1. Enter system view.
2. Enter voice view.
3. Configure echo cancellation
parameters.
4. Exit voice view.
5. Enter voice subscriber line
view.
6. Enable the echo cancellation
function.
7. Configure echo duration.
8. Enable the nonlinear
function of echo
cancellation.

Configuring gain adjustment function

Voice subscriber line
To configure the gain adjustment function on a voice subscriber line:
Step
1. Enter system view.
2. Enter voice subscriber line
view.
Parameters adjusted
Enlarge the control factor of
mixed proportion of noises.
Enlarge the judgment threshold
for bidirectional conversation.
Command
system-view
voice-setup
echo-canceller parameter
{ convergence-rate value |
max-amplitude value |
mix-proportion-ratio value |
talk-threshold value }
quit
subscriber-line line-number
echo-canceller enable
echo-canceller tail-length
milliseconds
nlp-on
Command
system-view
subscriber-line line-number
50
Effect
Too high a control factor leads
to audio discontinuity.
Too high a judgment threshold
slows down the convergence of
the filter factor.
Remarks
N/A
N/A
Optional.
By default, the convergence rate
of comfort noise amplitude is 0,
the maximum amplitude of
comfort noise is 256, the comfort
noise mixture proportion control
factor is 100, and the threshold of
two-way talk is 1.
N/A
N/A
Enabled by default.
Optional.
The default is 0 milliseconds.
Optional.
Enabled by default.
This command is available only
after the echo-canceller enable
command is executed.
Remarks...
N/A
N/A