ETSI TR 146 055-2010 数字蜂窝通信系统(第2阶段).GSM增强型全速率(EFR)语音编解码器的性能特征(版本9.0.0).3GPP TR 46.055(版本9.0.0,第9次发布)
Digital cellular telecommunications system (Phase 2+); Performance characterization of the GSM Enhanced Full Rate (EFR) speech codec V9.0.0; 3GPP TR 46.055 version 9.0.0 Release 9