Mgi Dsp Options - Samsung OfficeServ 7000 Series Programming Manual

CHAPTER 2. MMC Programming

[835] MGI DSP OPTIONS

This MMC provides various MGI options.
MGI 16/64 Card and embedded MGI parameters
No Parameter
00 AUDIO CODEC
01 ECHO CANCEL
02 DUAL-FLT EC
03 NLP
04 EC GAIN
05 EC TAIL LEN
2-370
Description
Selects the Audio Codec of an MGI card and specify the
transmission interval time of the VoIP packet.
Enables or disables echo cancellation. This function
removes the echo that is generated by voice reflection
and packet delay.
This option selects the Mode of Dual Filter echo
cancellation. It is improved echo cancellation. This
should be set by Analog Trunk card. If mode is selected
to Disable (Sparse EC), system should be reset.
This option controls the non-linear processor.
Set NLP value (0~2).
- 0: Normal level of NLP engagement. (Default)
- 1: NLP Tune Option 2 (Reduced level of NLP
engagement).
- 2: NLP Tune Option 1 (Increased level of NLP
engagement).
NLP Tune Option 2 (Reduced level of NLP
engagement).
For applications where the default NLP level causes
unpleasant voice artifacts (like choppiness at the
beginning of the call in heavy double talk situations), the
Host may select the NLP Tune Option 2 setting to
reduce the level of NLP engagement.
NLP Tune Option 1 (Increased level of NLP
engagement):
For certain 2-to-4 wire hybrid or line conditions where a
larger than normal non-linear component in the echo is
present, the Host may select the NLP Tune Option 1
setting for an increased level of NLP engagement in
order to provide an adequate echo control performance.
The normal non-linear echo component is defined to be
at a level comparable to that from G.711 companding
(for example, in G.168, the only non-linear component
considered in the echo is G.711 companding only).
This option takes effect only when EC is ON.
This option is used to program the digital gain control for
the Mindspeed Comcerto Device 'Decoder-to-EC' signal
path, when voice decoding is active.
Set EC gain value. The range is 18~38 (-14 dB ~ +6 dB)
Network Echo Canceller Tail Length (HECLEN).
Used to set the Echo Canceller configuration.
Echo Canceller Tail Length is adjustable from 8 ms to
128 ms, in 8 ms increments.
Set EC Tail length. The range is 8~128 ms.
Default
G.711
ENABLE
8TRK2
MODE
0
32 (0 dB)
64 ms
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