臺灣博碩士論文加值系統

　　近年來由於網際網路迅速的普及，以及網路頻寬不斷的增加，因此低通訊成本及具有較高安全性的網路電話（Voice over Internet Protocol, VoIP），正快速地改變傳統的語音通訊方式。
　　為了快速地了解透過網路傳送語音封包的技術，並且在未來能夠發展出網路電話，因此我們將藉由分析與研究已經發展完成並且開放原始碼的語音會議軟體，來達到此目的。
　　在本篇論文中我們研究傳輸具有即時特性封包的網路協定RTP/RTCP，以及語音會議軟體RAT（Robust-Audio Tool）的功能，更進一步地藉由研究RAT的程式來了解其軟體架構與程式執行流程，並且對組成RAT的各個功能區塊作執行時間的分析。

　　Because of the fast popularization and the increasing bandwidth of Internet in recent years, the network telephone VoIP (Voice over Internet Protocol) of the low communication cost and higher security changes the traditional audio communication way rapidly.
　　In order to understand rapidly the technology of delivering real-time audio data packet through the network, and develop the network telephone in the future, we study and analyze the audio conferencing software that has already developed and is an open source.
　　In this thesis we study the Real-time Transport Protocol (RTP) and the Real-time Control Protocol (RTCP) for transmitting real-time packets, and the function of audio conferencing software RAT (Robust-Audio Tool). We present the architecture and the execution flow of the RAT by tracing code. Finally, we present the execution time of each function block making up RAT.

摘要
Abstract
第一章 緒論 .............................................. 1
1.1 研究背景與動機 ...................................... 1
1.2 研究目的 ............................................ 2
1.3 論文架構 ............................................ 3
第二章 相關研究 .......................................... 4
2.1 多點傳送網路的簡介 .................................. 4
2.1.1 最短路徑樹狀結構 ................................. 7
2.1.2 距離向量多點傳送 ................................. 8
2.1.3 通訊協定獨立多點傳送 ............................ 10
2.2 Tcl/Tk的介紹 ....................................... 11
2.3 訊息匯流排的介紹 ................................... 13
第三章 RTP和RTCP協定的介紹 .............................. 22
3.1 簡介 ............................................... 22
3.1.1 簡易的群播音訊會議 .............................. 23
3.1.2 音訊會議與視訊會議 .............................. 24
3.2 協定中各項專有名詞的定義與時間的格式 ............... 25
3.2.1 專有名詞的定義 .................................. 25
3.2.2 時間格式 ........................................ 27
3.3 RTP資料傳輸協定 .................................... 28
3.3.1 RTP標頭的欄位定義 ............................... 28
3.3.2 規格文件對RTP標頭的調整 ......................... 30
3.3.3 RTP標頭的擴充 ................................... 30
3.4 RTP控制協定-RTCP ................................... 31
3.4.1 RTCP封包的種類與格式 ............................ 33
3.4.2 發送端回報與接收端回報 .......................... 34
3.4.3 來源端的描述封包SDES ............................ 42
3.4.4 BYE：RTCP的BYE封包 .............................. 47
3.4.5 APP: 特殊應用工具定義的RTCP封包 ................. 48
第四章 RAT的介紹與架構 .................................. 49
4.1 RAT簡介與執行方式 .................................. 49
4.2 RAT選項視窗 ........................................ 51
4.3 RAT會議參與者視窗 .................................. 63
4.4 RAT系統架構與程式流程 .............................. 71
第五章 時間分析與實驗結果 ............................... 80
5.1 功能區塊之時間分析 ................................. 80
5.2 程序所需之系統記憶體 ............................... 90
第六章 結論與未來發展 ................................... 91
參考文獻 ................................................. 93

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