【正文】 瀏覽器支持。 前 言 會(huì)議，是人類社會(huì)經(jīng)濟(jì)生活中不可或缺的一部分，有關(guān)的研究表明，通信的有效性約 55%依賴于面對(duì)面（ facetoface）的視覺效果， 38%依賴于說話語(yǔ)音，視聽是人們獲取信息的最重要形式，而面對(duì)面的討論（ facetoface）是人類表達(dá)思想最豐富的一種方式。 視頻會(huì)議（ VideoConference）系 統(tǒng)是一種能把聲音、圖像、文本等多種信息從一個(gè)地方傳送到另一個(gè)地方的通信系統(tǒng)。（ 2）鑒于視頻會(huì)議系統(tǒng)在軍事、經(jīng)濟(jì)、文化等領(lǐng)域給人類帶來的巨大作用和經(jīng)濟(jì)效益，各國(guó)競(jìng)相研究和開發(fā)視頻會(huì)議系統(tǒng)，特別是在超大規(guī)模集成電路、壓縮算法及視覺生理研究方面取得了突破性進(jìn)展和關(guān)于視頻會(huì)議的一系列國(guó)際標(biāo)準(zhǔn)相繼出臺(tái)，以及各種圖像實(shí)時(shí)處理芯片紛紛推出后，視頻會(huì)議系統(tǒng)的實(shí)用化才得到長(zhǎng)足的發(fā)展。視頻會(huì)議系統(tǒng)實(shí)質(zhì)上是計(jì)算機(jī)技術(shù)和通信技術(shù)相結(jié)合的產(chǎn)物，所以 通信網(wǎng)絡(luò)是視頻會(huì)議系統(tǒng)的基礎(chǔ)組成部分之一，會(huì)議終端是將視頻、音頻、數(shù)據(jù)、信令等等各種數(shù)字信號(hào)分別進(jìn)行處理后組合成的復(fù)合數(shù)字碼流，再將碼流轉(zhuǎn)變?yōu)榕c用戶 網(wǎng)絡(luò)兼容的接口，符合傳輸網(wǎng)絡(luò)所規(guī)定的信道幀結(jié)構(gòu)的信號(hào)格式送上信道進(jìn)行傳輸。（ 4） 視頻會(huì)議系統(tǒng)的終端設(shè)備承擔(dān)了多種媒體信息的輸入、輸出和處理，以及用戶和網(wǎng)絡(luò)之間的連接、交互和控制等多項(xiàng)任務(wù)。 MCU 將各個(gè)終端送來的信號(hào)進(jìn)行分離，抽取出音頻、視頻、數(shù)據(jù)和信令， 分別送到相應(yīng)的處理單元，進(jìn)行音頻混合或切換，視頻切換、數(shù)據(jù)廣播、路由選擇、會(huì)議控制、定時(shí)和呼叫處理等，處理后的信號(hào)由復(fù)用器按照 ，然后經(jīng)網(wǎng)絡(luò)接口送到指定端口。s life, thus grows day by day to their technical demand, thus caused them the repayment, the ine and other various aspects correspondingly has obtained the satisfactory result. Visual the C++ programming language is at present extremely widespread visible development kit which promotes by Microsoft Corporation, may develop using Visual C++ based on the Widnows platform 32 applications procedure, depends upon the formidable piler as well as the work and the database development ability, may develop the function formidable application procedure with Visual C++. VC++ is in the operating system the rapid application development environment newest edition. It also is in the current Windows platform the first prehensive support newest Web service fast development kit. Regardless of is the enterprise level user, or individual development, all can be relaxed using VC++, quickly develop outstandingly based on the correspondence procedure, the development highly effective nimble document operation sequence, the development nimble highly effective database operation sequence, and so on. VC++ is the industry standard RAD environment which the only support all newly appears, (expansion mark language) /XSL (may expand style language) including XML, SOAP (simple object deposit and withdrawal agreement) and WSDL (Web server description language) and so on. VC++ is the visible fast application procedure development language, it has provided the visible integrated development environment, this environment has provided a series of nimble and the advanced tool for the application programming personnel, may widely use in the type application programming. In the VC++ integrated development environment, the user may design the procedure code, the operating procedure, carries on the program error the debugging and so on, the visible method of exploitation reduced the application procedure development difficulty. The VC++ foundation programming language has the objectoriented characteristic C++ language. C++ has the code stably, the readability good, the translation speed is quick, the efficiency higher merit, and the objectoriented concept will obtain the full display, enable this language to have the brandnew development space Uses VC++ , we nearly may handle any matter, but also may pose plants each kind of type the application procedure, dynamic link storehouse (DLL), CON, or CORBA object, CGI/ISAPI procedure, Microsoft Back Office application procedure. The procedure scale to the simple individual database application, is slightly big to the plex enterprise39。s audio, data input / output devices and works. (1) Sometimes the need for video conferencing between multiple points of information transmission and exchange, then you can control unit by means of multipoint (MCU) to achieve. Multipoint control unit is actually a multimedia information exchange, multipoint call and connection, to achieve video broadcasting, video selection, audio mixing, data broadcasting and other functions, the pletion signal of the terminal tandem with the switch. MCU signals sent by the various terminals to separate, extract audio, video, data and signaling, respectively, corresponding to the processing unit, or switch audio mixing, video switching, data broadcasting, routing, session control, timing, and call processing, the processed signal from the multiplexer in accordance with the format, framing, and then sent to the designated port by the work interface. (5)