G4TUT/SK2022 Ham Member QRZ Page. Open source DSTAR voice - Codec2. Open source DSTAR voice - Codec2. The DSTAR protocol is open and freely available, developed by the Japanese Amateur Radio League (JARL). However, the AMBE voice encoding scheme currently used by the DSTAR protocol is not open, rather it is patented by DVSI, Inc. More @Wikipedia
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