Specifications

Net-2000™ VCU Users Manual

Version 4.0, December, 2013

IP Mode

4.5 AMBE+2™ Vocoder Version

The AMBE+2™ Vocoder is DVSI’s newest low data rate vocoder technology. The Net-2000™ VCU incorporates

the AMBE+2™ Vocoder at 4.0 kbps with no FEC. It has been shown to outperform DVSI’s previously industry-

leading AMBE+™ Vocoder and AMBE™ vocoder technologies. It is designed to be particularly robust and

perform exceptionally well even under bit errors and acoustic background noise conditions.

Table 5 AMBE+2™ Vocoder Data Rate Selection

4.6 Vocoder Selection (GMR-1 or GMR-2 Version)

Vocoder Type and rate/FEC selection is done from the VOIP Mode window. The user has the ability to run the

GMR-1 or GMR-2 (depending on the Net-2000 version) vocoder with or without FEC using the Data Rate drop

down menu. The default rate for the GMR-1 vocoder is 5200 bps (4000 bps speech source with 1200 bps FEC).

The only rate for the GMR-2 vocoder is 3600 bps (3600 bps speech source with 0 bps FEC).

4.6.1 GMR-1 Vocoder Selection

Figure 17 GMR-1 Vocoder Selection

(Subject to Change) Page 20

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