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嵌入式電話的軟體設計

嵌入式電話的軟體設計. 指導教授 : 蔡亮宙 學生 : 黃培修. Outline. Abstract INTRODUCTION PJSIP AND ITS ARCHITECTURE ARCHITECTURE OF EMBEDDED VIDEO PHONE DESIGN AND IMPLEMENT OF SOFTWARE CONCLUSION. Abstract. PJSIP Stack. BF561. INTRODUCTION. 1 ˙信令協議選擇 2 ˙微處理機的能力 處理多媒體數據 嵌入式操作系統 uClinux.

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嵌入式電話的軟體設計

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  1. 嵌入式電話的軟體設計 指導教授 : 蔡亮宙 學生 : 黃培修

  2. Outline • Abstract • INTRODUCTION • PJSIP AND ITS ARCHITECTURE • ARCHITECTURE OF EMBEDDED VIDEO PHONE • DESIGN AND IMPLEMENT OF SOFTWARE • CONCLUSION

  3. Abstract PJSIP Stack BF561

  4. INTRODUCTION 1˙信令協議選擇 2˙微處理機的能力 處理多媒體數據 嵌入式操作系統uClinux

  5. PJSIP AND ITS ARCHITECTURE • PJSIP的優勢: 1˙有所有SIP的function 2˙PJSIP可以支持大多數的硬件 3˙擴展性

  6. PJSIP AND ITS ARCHITECTURE

  7. Transport manager • 它有定時器棧實例，並調度計時器所有的SIP組件。 • 它管理PJSIP模塊。模塊是堆棧伸過消息解析和傳輸的主要手段 • 它接收傳入的SIP消息從交通管理和分發消息到模塊。

  8. SIP endpoint • 接收傳輸數據包，並提供SIP消息到端點。 • 找到匹配的傳輸發送SIP消息到特定的目標 • 基於傳輸類型和遠程地址。

  9. ARCHITECTURE OF EMBEDDED VIDEO PHONE • 嵌入式視頻電話設計在這裡正與圖形用戶界面（GUI），它可以建立，修改和SIP協議終止對話。該算法如G.711，G.723.1，H.261和H.263都支持。與此同時，它具有回音消除，防火牆穿越，抖動緩衝，音頻和視頻，靜音檢測等之間的同步功能。

  10. Architecture of Embedded Phone

  11. Signaling Module

  12. Media Module

  13. Master Control Module

  14. Test • 鏈接BF561和PC單獨切換，設置它們的IP為192.168.1.1和192.168.1.2。 • 在Linux上運行編譯後的程序，它是專為BF561。 • 輸入命令：撥打SIP：192.168.1.2，它代表一個請求到PC，PC機時接受它，輸入A和200這意味著接受請求。在這一刻，BF561和PC兩個終端上會顯示“您正在通話”，它顯示了會話建立成功。

  15. CONCLUSION 關於嵌入式可視電話終端方案，提出在本文中，它採用BF561處理器，PJSIP棧和uClinux的。測試表明，該方案是可行的，它可以符合RFC3261標準，實現IP的通信。隨著嵌入式技術的快速發展，嵌入式可視電話終端有一個光明的未來。

  16. REFERENCES Xue Meng, Zhang Hong, Liu Bing, “Image Coding Technique andStandardization. Computer Engineering and Design,” 25(9), pp.1476-1478, 2004 Liu Zhi-jun, Wang Feng, “The Protocol of Soft Switch Technologyand Application in VoIP,” Microcomputer Information, 09(3),pp.169-172, 2006. Analog Device, “The Application of uClinux on BF561 Processor,”Global Electronics China, ,(1) pp. 92-98, 2005. Benny Prijono, PJSIP home page, www.pjsip.org. Zhang Rong, “Application and Research of SIP Protocol.ComputerTechnology and Development, ” 16(6), pp.71-73, 2006 Zheng Hui, Tu Gang, “Design of embedded Video Monitor Endpointbased on Dual Core DSP,” Computer Engineering and Design, 28 (9),pp.2092-2095,2007.

  17. Thanks for your patient.

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