Thursday, August 31, 2017 | Comments
Digital Voice Systems, Inc. (DVSI) developed the revolutionary voice compression model – Advanced Multiband Excitation (AMBE) – to provide superior voice quality and performance at low data rates.  DVSI’s AMBE speech compression (vocoder) software is more efficient and less complex than traditional linear prediction-based speech models and therefore enables more cost-effective implementations and system designs.

The premier AMBE+2™ Vocoder sets the standard for high-quality, high-performance speech at data rates from 2.0 to 9.6 kilobytes per second.  The AMBE+2™ vocoder has been shown to outperform DVSI’s previously industry-leading AMBE+™ Vocoder as well as the G.729 and G.726 vocoders, while operating at only 4.0. KBPS.  The AMBE+2™ has been designed to be particularly robust and perform exceptionally well under bit errors and extreme acoustic background noise conditions.  Once again, DVSI has raised the bar on performance expectations regarding low-rate vocoders across the entire mobile industry.

The superior performance characteristics of the AMBE+2™ Vocoder make it ideally suited for mobile radio, secure voice, satellite communication, computer telephony, digital voice and storage applications where bandwidth is at a premium and high-quality at low data-rates is imperative.


  • Maintains speech intelligibility and speaker recognition at rates as low as 2.0 kbps
  • Resistant to background noise and channel bit errors
  • Customizable data from 2.0 to 9.6 kbps
  • Uses fewer computations than CELP
  • Does not require the use of a residual signal
  • Eliminates fixed data-rate and codebook problems
  • Low complexity reduces implementation costs


DVSI’s patented AMBE vocoder technology has been implemented by leading manufacturers around the world. AMBE+2™ vocoder technology has proven its superior performance in critical communication applications such as digital mobile radio and satellite telephony, in a diverse range of wireless devices. In fact, the success of the AMBE+2™ vocoder has resulted in it being chosen as the voice compression standard in most digital mobile radio and satellite telephony protocols including APCO Project P25, DMR, dPMR, NXDN, Thuraya, Inmarsat, MEXSAT, Iridium and others.

AMBE+2™ vocoder software libraries are available under license for a wide variety of Digital Signal Processors (DSPs) and CPU Processors, as well as various run-time environments. DVSI also offers a complete line of hardware products that incorporate AMBE+2™ vocoder technology, including half and full-duplex IC chips, USB devices and vocoder test sets. Please visit for more information.

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