DIN EN 301250-2003 数字蜂窝式电信系统(相位2).GSM增强全速率语音编解码器的测试顺序
Digital cellular telecommunications system (Phase 2) - Test sequences for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.54 version 4.0.1) (Endorsement of the English version EN 301250 V 4.0.1 (1998-09) as German standard)