GSM 06.51_增强全速率话音处理 GSM 06.60_增强全速率码型变换 GSM技术规范目录_GSM 06系列_话音编码规范.pdf-ETSI EN 300 723 V8.1.1 (2000-11) Digital cellular telecommunications system (Phase 2+) (GSM) Enhanced Full Rate (EFR) speech processing functions General descr i