ETSI PRETS 300 581-7-1997 数字蜂窝通信系统(第2阶段).半速率语音.第7部分:GSM半速率语音编解码器的ANSI-C码(VAD).GSM 06.06(第2版,版本4.2.0)
Digital Cellular Telecommunications System (Phase 2); Half Rate Speech; Part 7: ANSI-C Code for the GSM Half Rate Speech Codec Second Edition; GSM 06.06 Version 4.2.0