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ETSI ETS 300 581-2
- Digital cellular telecommunications system (Phase 2) (GSM); Half rate speech; Part 2: Half rate speech transcoding (GSM 06.20 version 4.3.1)
- standard by European Telecommunications Standards Institute, 05/01/1998
- Publisher: ETSI
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Selection, test and standardization of a combined speech channel- coding algorithm at a data rate of 11.4 kbit/s to be used in the GSM-DMR system.