mbelib 1.3.0-1.9a04ed5 P25 Phase 1 and ProVoice vocoder

The mbelib library provides support for the 7200x4400 bit/s codec used in P25 Phase 1, the 7100x4400 bit/s codec used in ProVoice and the Half Rate 3600x2250 bit/s vocoder used in various radio systems.