Vocoder
NXDN™ has utilized the AMBE+2™ vocoder from Digital Voice Systems, Inc. (DVSI). This vocoder is recognized as the leading low-bit rate vocoding technology and has also been widely adopted in other two-way radio standards like dPMR™, DMR, P25 Phase 1 and Phase 2. The use of this vocoder in its “half-rate” mode is also a leading factor in achieving 6.25 kHz operation. The vocoding advancements in P25, an accepted digital standard, allowed further enhancements to signal quality.