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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

IP Mode

4.4 AMBE® / AMBE+™ Vocoders Version

The AMBE® mode is compatible with DVSI’s AMBE-1000™, AMBE-2000™ and AMBE-2020™ Vocoder Chips.

DVSI’s proprietary AMBE® Voice Compression Technology delivers excellent voice quality even at low data rates.

Proven to be a superior alternative to linear predictive model vocoders, the AMBE® Voice Compression

Technology has been chosen as the standard for several major satellite and mobile radio communications systems.

The Net-2000™ VCU supports AMBE® Vocoder bit rates from 2000 to 9600 bps. The rates available are the

combination of the speech data and the Forward Error Correction (FEC).

Independent test results have shows DVSI’s AMBE+™ Vocoder running at 4.8 kbps and 4.0 kbps outperforms both

the ITU G.726A vocoder at 32 kbps and the ITU G.729 vocoder at 8 kbps. This voice coder builds upon the

strengths of DVSI’s previous IMBE™ and AMBE® Technology to provide toll quality speech with unsurpassed

robustness to both acoustic noise and channel errors. The AMBE+™ Vocoder provides a 2-8 times reduction in bit

rate while delivering toll-quality performance with maximizing bandwidth efficiency.

Figure 16 AMBE® / AMBE+™ Vocoder Type and Rate Selection

Vocoder Type and rate/FEC selection is done from the VOIP Mode window. To set the Net-2000™ VCU vocoder,

first select the vocoder mode (AMBE® / AMBE+™ or AMBE+2™), then select the Rate / FEC using the Bit Rate

drop down menu. The default vocoder is set to AMBE+2™ @ 4000 bps with 0 bps FEC.

(Subject to Change) Page 19

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