网络带宽受限的音视频通信机制研究
发布时间：2018-10-19 18:49
【摘要】： 多媒体化已经成为日新月异的网络通信系统发展的基本趋势,以音视频等业务为主的多媒体网络通信的需求变得日益强烈。 音视频相对于其他数据业务对网络的带宽要求很高,但是当前的网络存在带宽过低、变化剧烈等带宽受限的问题往往达不到要求,因此经常出现丢包、画面马赛克和卡壳等影响播放质量的问题。本文提出了网络带宽受限条件下的音视频通信机制,构建了具有QoS机制的音视频数据通信系统,其主要特点是:(1)针对带宽变化剧烈的网络环境,综合应用FGS可分级编码、差错控制和本文提出的FTFRC(FGS-based TCP-Friendly Rate Control Protocol)码率调整算法提出了一种传输框架,FTFRC针对目前广泛应用的TFRC算法做了改进,使音视频码流和网络带宽参数建立了更好的匹配机制;(2)针对无线通信带宽过低的特点,提出了基于兴趣区域的异步传输机制,通过图像处理提取用户感兴趣的关键信息,以较小的音视频数据包实现音视频关键信息的及时无线传送。为解决传统音视频通信系统不易适应网络状况而降低服务质量的问题提供了一种具有应用价值的技术。 本文对通信机制、算法和模块设计做了详细的阐述,并对系统实现做了介绍。实际测试数据表明,系统已基本达到了设计功能,主要模块已在中国电信全球眼金华网络系统、义乌公交车站广告系统中得到应用。
[Abstract]:Multimedia has become the basic trend of the rapid development of network communication systems. The demand for multimedia network communication, such as audio and video services, has become increasingly strong. Compared with other data services, audio and video require very high bandwidth, but the bandwidth of the current network is too low and the bandwidth is limited, such as drastic changes, so it often occurs packet loss. Screen mosaic and jam and other issues affecting the quality of play. In this paper, the audio and video communication mechanism under the condition of limited network bandwidth is proposed, and the audio and video data communication system with QoS mechanism is constructed. The main features of this system are as follows: (1) for the network environment where bandwidth changes dramatically, FGS scalable coding is applied synthetically. Error control and FTFRC (FGS-based TCP-Friendly Rate Control Protocol) rate adjustment algorithm) are proposed in this paper. FTFRC improves the TFRC algorithm, which is widely used at present. A better matching mechanism between audio and video stream and network bandwidth parameters is established. (2) aiming at the low bandwidth of wireless communication, an asynchronous transmission mechanism based on region of interest is proposed to extract the key information of interest to users through image processing. Small audio and video packets are used to realize timely wireless transmission of key audio and video information. In order to solve the problem that the traditional audio and video communication system is difficult to adapt to the network conditions and reduce the quality of service, this paper provides a technology with application value. In this paper, the communication mechanism, algorithm and module design are described in detail, and the implementation of the system is introduced. The actual test data show that the system has basically reached the design function and the main modules have been applied in China Telecom Global Eye Jinhua Network system and Yiwu bus Station Advertising system.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TN919.8
本文编号：2282045
[Abstract]:Multimedia has become the basic trend of the rapid development of network communication systems. The demand for multimedia network communication, such as audio and video services, has become increasingly strong. Compared with other data services, audio and video require very high bandwidth, but the bandwidth of the current network is too low and the bandwidth is limited, such as drastic changes, so it often occurs packet loss. Screen mosaic and jam and other issues affecting the quality of play. In this paper, the audio and video communication mechanism under the condition of limited network bandwidth is proposed, and the audio and video data communication system with QoS mechanism is constructed. The main features of this system are as follows: (1) for the network environment where bandwidth changes dramatically, FGS scalable coding is applied synthetically. Error control and FTFRC (FGS-based TCP-Friendly Rate Control Protocol) rate adjustment algorithm) are proposed in this paper. FTFRC improves the TFRC algorithm, which is widely used at present. A better matching mechanism between audio and video stream and network bandwidth parameters is established. (2) aiming at the low bandwidth of wireless communication, an asynchronous transmission mechanism based on region of interest is proposed to extract the key information of interest to users through image processing. Small audio and video packets are used to realize timely wireless transmission of key audio and video information. In order to solve the problem that the traditional audio and video communication system is difficult to adapt to the network conditions and reduce the quality of service, this paper provides a technology with application value. In this paper, the communication mechanism, algorithm and module design are described in detail, and the implementation of the system is introduced. The actual test data show that the system has basically reached the design function and the main modules have been applied in China Telecom Global Eye Jinhua Network system and Yiwu bus Station Advertising system.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TN919.8
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