| 1. | Research and development for itu - t h . 324 recommendation compliant videophone system
324协议的桌面式可视电话系统 |
| 2. | So we design a video phone system based on h . 323 and trimedia tm1300 dsp
为此，我们进行了基于h . 323和trimediatm1300处理器芯片的ip可视电话系统的设计和实现。 |
| 3. | It can execute more complex algorithm and it is cheaper . so we designed a videophone system based on h . 323 and dsp
基于以上的情况，我们进行了基于h . 323和dsp的可视电话系统的设计和实现。 |
| 4. | In the first chapter , the developping history and foreground of ip video phone and the system framework of the video phone including hardware and software framework are introduced
在第一章中先简介ip可视电话系统的发展历程、前景和软硬件框架结构，然后简要说明作者的研究工作。 |
| 5. | This paper introduces the latest development of multimedia communication technology . the design framework of videophone system on atm broadband network is given and several key technologies are presented in detail
首先介绍多媒体通信技术的最新发展,然后讨论多媒体通信系统的设计和实现,给出基于atm网络的宽带多媒体可视电话系统设计框架及其关键技术。 |
| 6. | The video - phone we design is based on ip network , because ip network is wide - spread and is spreading now and it can provide wide band which is important to guarantee the quality of communication . the corresponding protocol of itu is h . 323
我们设计的可视电话系统是基于ip的，这是因为目前ip网络已经比较普及，并且还在快速发展。另外ip网络可以提供的带宽比较宽，容易取得令人满意的通话质量。 |
| 7. | The videophone , which combinewiths the computer ’ s alternation , the communication ’ s distribution , and the multimedia ’ s real - time characteristic , is accepted by more information and timely responds . the research work of the videophone system includes the developments of the hardware and the software
可视电话系统正是以这种信息多元化、响应及时化等特点颇受大众接受,它将计算机的交互性、通信的分布性和多媒体的实时性完美的结合起来。 |
| 8. | The main processor we use is tm1300 produced by philips co . tmlsoo has a lot of advantages such as it has vliw which is suited to processing multimedia data and it also have a convenient developing tool . using tm1300 we only need few chips to implement our video - phone system
我们用philips的tm1300作为我们系统的主芯片，再配以必要的外围器件来构成可视电话系统。之所以选择tm1300 ，是因为它是一个高效率的dsp芯片，具有vliw指令，特别适合来进行多媒体处理。 |
| 9. | The video phone system designed by us is mainly the real - time implement of a - v codec the implement of h . 323 protocol stack and the implement of the network communication protocol for example pppoe smtp and pop3 etc . so we not only ensure that the qos of the a - v codec ' s datum , but also develop the increment services for example e - mail system and browser etc . the paper will emphasis on the graft and realization of the internet protocols h . 263 video codec rate control algorithms for video encoder and optimization methods of the codec based on tm1300 . h . 323 sip , h . 264 and psos + are also simply introduced
本文主要针对作者在实现ip可视电话系统中所从事的研究工作而展开的，将重点放在ip可视电话系统中tcp ip协议栈在psos +上的移植、网络通信协议如pppoe 、 ppp 、 smtp 、 imap 、 pop3 、 dns 、 dhcp等协议的实现、 h . 263视频编码及其码率控制算法研究、视频编码中基于程序结构和7m1300dsp专用指令的优化方法，同时初步介绍h . 323 、 sip 、 h . 264及嵌入式系统中的实时操作系统( rtos ) psos + 。 |
| 10. | It depends on the analyzing of mpeg - 4 encoding and transporting researched before , and on directshow technology . the components , such as the real - time sample , video encoding , video decoding and display , are programmed and tested . in order to application , the author presents a structure between clients and a structure between client and server , aimed to manage the action of clients
最后，在前述对mpeg - 4视频编码与传输的分析和设计基础上，作者采用directshow技术，给出了网络可视电话系统的可行性方案，对视频的实时采集、 mpeg - 4视频编码、视频传输和解码显示进行了编码测试；为使系统设计能够实用化，作者还设计了客户端与客户端、客户端与目录服务器的通讯数据结构，实现了对客户的网络管理。 |
