06.533GPPANSI-C code for the GSM Enhanced Full Rate (EFR) speech codecTS
Definition of terms used in the present document can be found in GSM 06.60 , GSM 06.61 , GSM 06.62 , GSM 06.81  and GSM 06.82 .
For the purposes of the present document, the following abbreviations apply:
ANSI American National Standards Institute
DS‑HD Double Sided High Density
ETS European Telecommunication Standard
GSM Global System for Mobile communications
ROM Read Only Memory
For abbreviations not given in this clause see GSM 01.04 .