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GSM, Global System for Mobile Communications
ETS 300 581 Half rate speech - Part 1 - Processing functions (1998-03) (GSM 06.01)
ETS 300 581 Half rate speech - Part 2 - Half rate speech transcoding (1995-11) (GSM 06.20)
ETS 300 581 Half rate speech - Part 8 - Test sequences for the GSM half rate speech codec (1996-01) (GSM 06.07)
ETS 300 726 Enhanced Full Rate (EFR) speech transcoding (1999-07) (GSM 06.60 version 5.2.1)
ETS 300 961 Full rate speech - Transcoding (1997-03) (GSM 06.10 version 5.0.1)
ETSI EN 300 969 Half rate speech, Half rate speech transcoding (2000-01) (GSM 06.20 version 7.0.1 Release 1998)
GSM by Wikipedia (2022-03-07)
GSM Network and Services, Voice coding by Johan Montelius
