DIN ETS 300581-7-2001 数字移动电话远程通信系统(阶段2).半价话务.第7部分:移动通信全球系统(GSM)半价话务编解码器的ANSI-C代码 (英文版本核准本 ETS 300581-7:1998-03 作为德国标准)
Digital cellular telecommunications system (Phase 2) - Half rate speech - Part 7: ANSI-C code for the GSM half rate speech codec (Endorsement of the English version ETS 300581-7:1998-03 as German standard)