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Design and Implementation Based on the VoIP network RDclient audio system

Author: DengXiaoMing
Tutor: XiangYanPing
School: University of Electronic Science and Technology
Course: Software Engineering
Keywords: RDclient VoIP Audio compression
CLC: TN916.2
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


This paper describes how to laboratory-based development Remote Desktop client software RDclient the audio transmission system developed a remote connection environment, upcoming Linux client audio transmission to a remote desktop connection windows server-side and play with RDclient original one can make windows server-side audio transmission combination to the the linux client audio transmission channel, two-way audio transmission function remote connection, and can use this system to be applied to the field of distance learning, telemedicine. Papers can be generally classified as two end systems, Linux client system and windows server-side system, broken down into five modules, namely, the linux audio capture module, encode audio data compression module, the TCP audio transmission module, audio data decompression decoding module, the windows audio data playback module. Make full use of the the VoIP field of a variety of techniques, and the pursuit of low-latency audio transmission, good continuity, take up network bandwidth and small target. Paper start from the VoIP application, detailing the basic principles of VoIP and delay factors as well as related technology, taking into account the security of VoIP, an objective description of the current status quo of VoIP applications, the paper RDclient detailed description and analysis, through the analysis of the current RDclient inadequacies need to be improved in order to achieve the needs of the project. Then began to design and the linux client audio capture and compression coding fork out main RDclient program sub-process plug-ins, began to sound card programming done a detailed description of the ITU-T definition of the various compression algorithm such as G.711 , G.723, G.729, and so on, analyzed, and ultimately the use of G.711 A-law compression algorithm, and in the acquisition of audio and compressed audio between the use of multi-threading technology, then describes in detail the process through between father and son pipeline audio data communication. Then designed and implemented the audio transmission system based on TCP protocol, in the design process, make full use of the VoIP transmission technology to avoid packet disorder, increased latency. Continuity as well as trying to reduce the final design and implementation of the windows server-side encoding and playback of audio decompression, describes the windows sound card programming process, and extract the decoding and playback operation between the use of multi-threading technology with double buffering technology, the audio playback delay. Linux and windows at both ends of grasping the audio packet test, the experimental results show that the compression and transmission data after almost no change in the realization of the system is very perfect. Finally, the paper is a summary description of the function of the realization of innovative ideas and direction and pointed out that future improvements.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Phone > Telephone lines, telephone network
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