HW-GSM&UMTS軟交換VoIP語(yǔ)音實(shí)現(xiàn)技術(shù).pdf (1007.42 KB)【資料名稱】:GSM&UMTS軟交換VoIP語(yǔ)音實(shí)現(xiàn)技術(shù)
【資料作者】:xx
【資料日期】:2012-1-1
【資料語(yǔ)言】:中文
【資料格式】:PDF
【資料目錄和簡(jiǎn)介】:
第1章 GSM/UMTS語(yǔ)音編解碼 ................................................................................................. 4
1.1 語(yǔ)音編解碼概述 ..................................................................................................................... 4
1.2 常用語(yǔ)音編解碼 ..................................................................................................................... 6
1.2.1 G.711A/μ編解碼 ........................................................................................................ 6
1.2.2 G.726編解碼 .............................................................................................................. 7
1.2.3 G.729A編解碼 ............................................................................................................ 7
1.2.4 AMR全速率編解碼 ..................................................................................................... 7
1.2.5 AMR2編解碼 .............................................................................................................. 9
1.2.6 EFR、FR、HR編碼 .................................................................................................... 9
1.2.7 RFC2833協(xié)議檢測(cè)傳送DTMF信號(hào) ........................................................................ 10
軟交換VoIP語(yǔ)音實(shí)現(xiàn)原理 ....................................................................................................... 12
1.3 軟交換IP語(yǔ)音實(shí)現(xiàn)概述 ...................................................................................................... 12
1.4 Nb接口控制面:IPBCP ...................................................................................................... 13
1.4.1 Nb接口簡(jiǎn)介 .............................................................................................................. 13
1.4.2 IPBCP協(xié)議功能 ....................................................................................................... 14
1.4.3 IPBCP消息 ............................................................................................................... 15
1.4.4 IPBCP基本流程 ....................................................................................................... 15
1.5 Nb接口用戶面:Nb UP ...................................................................................................... 19
1.5.1 Nb UP協(xié)議功能........................................................................................................ 19
1.5.2 Nb UP協(xié)議結(jié)構(gòu)........................................................................................................ 20
1.5.3 Nb UP基本流程........................................................................................................ 22
1.6 A接口/Iu接口的語(yǔ)音實(shí)現(xiàn) ................................................................................................... 27
1.6.1 A接口IP化概述 ....................................................................................................... 27
1.6.2 Iu接口IP化概述 ...................................................................................................... 28
第2章 UMG8900支持的語(yǔ)音增強(qiáng)技術(shù) ................................................................................... 32
2.1 語(yǔ)音增強(qiáng)概述 ...................................................................................................................... 32
2.2 語(yǔ)音增強(qiáng)原理和流程 ............................................................................................................ 35
2.2.1 VQE功能 .................................................................................................................. 35
2.2.2 TFO功能 .................................................................................................................. 36
2.2.3 TrFO功能 ................................................................................................................. 37
2.2.4 舒適噪音生成功能 (CNG) ......................................................................................... 38
2.2.5 靜音檢測(cè)功能(VAD) .................................................................................................. 38
2.2.6 丟包補(bǔ)償(PLC) .......................................................................................................... 39