| 利用实时监测软观察仪辅助可视通信系统的开发 |
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| 引用本文： | 徐彦彦,边学工,喻占武.利用实时监测软观察仪辅助可视通信系统的开发[J].武汉大学学报(信息科学版),2002,27(1):52-56. |
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| 作者姓名： | 徐彦彦 边学工 喻占武 |
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| 作者单位： | 武汉大学多媒体网络通信工程湖北省重点实验室,武汉市珞喻路129号,430079 |
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| 摘 要： | 在基于ISDN的H．320Videophone通信系统的开发过程中,介绍了利用软观察仪在确立系统软硬件分工、调整系统采用的算法、图像码率控制、码率统计及图像格式选取等方面的作用。
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| 关 键 词： | 实时监测 软观察仪 可视通信系统 |
| 文章编号： | 1000-050X(2002)01-0052-05 |
| 修稿时间： | 2001年12月10 |
Using Real-time Monitoring Observer to Assist the Development of Audio Visual Communication System |
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| XU Yanyan,BIAN Xuegong,YU Zhanwu.Using Real-time Monitoring Observer to Assist the Development of Audio Visual Communication System[J].Geomatics and Information Science of Wuhan University,2002,27(1):52-56. |
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| Authors: | XU Yanyan BIAN Xuegong YU Zhanwu |
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| Institution: | XU Yanyan 1 BIAN Xuegong 1 YU Zhanwu 1 |
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| Abstract: | Using the principle of oscillograph on the analysis of hardware,we introduce the assistant application of real_time monitor observer in the development of audiovisual communication system.In this paper,we emphasize on introducing it's use in the development of videophone based on ISDN H.320 series protocols. Using the observer,we define kinds of "probes" independent of real communication system.Using these probes to monitor running system,dynamical parameters are snatched.Base on these parameters,the system characteristics are realized.Thus we can find the system's "bottle_neck" as soon as possible and adjust system design and optimize system. In the development of video module,we define parts of on_line monitoring windows,from which we can get statistic data;with which we adjust arithmetic in video coding module and decoding module.The same application in video module can help to control coding efficiency in video coding module,and help us to choose accurate video format in communication. Software probes in the application of the buffer in thread help us to know whether the buffer size is suitable,and make policy that we read and write data to those buffers.For example,according to on_line observing,we finally choose quantity and size of the audio buffer to achieve the best lip_synchronization result. |
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| Keywords: | observer videophone real_time monitor probe |
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