【摘要】： 多媒體化已經(jīng)成為日新月異的網(wǎng)絡(luò)通信系統(tǒng)發(fā)展的基本趨勢,以音視頻等業(yè)務(wù)為主的多媒體網(wǎng)絡(luò)通信的需求變得日益強(qiáng)烈。 音視頻相對于其他數(shù)據(jù)業(yè)務(wù)對網(wǎng)絡(luò)的帶寬要求很高,但是當(dāng)前的網(wǎng)絡(luò)存在帶寬過低、變化劇烈等帶寬受限的問題往往達(dá)不到要求,因此經(jīng)常出現(xiàn)丟包、畫面馬賽克和卡殼等影響播放質(zhì)量的問題。本文提出了網(wǎng)絡(luò)帶寬受限條件下的音視頻通信機(jī)制,構(gòu)建了具有QoS機(jī)制的音視頻數(shù)據(jù)通信系統(tǒng),其主要特點(diǎn)是:(1)針對帶寬變化劇烈的網(wǎng)絡(luò)環(huán)境,綜合應(yīng)用FGS可分級編碼、差錯控制和本文提出的FTFRC(FGS-based TCP-Friendly Rate Control Protocol)碼率調(diào)整算法提出了一種傳輸框架,FTFRC針對目前廣泛應(yīng)用的TFRC算法做了改進(jìn),使音視頻碼流和網(wǎng)絡(luò)帶寬參數(shù)建立了更好的匹配機(jī)制;(2)針對無線通信帶寬過低的特點(diǎn),提出了基于興趣區(qū)域的異步傳輸機(jī)制,通過圖像處理提取用戶感興趣的關(guān)鍵信息,以較小的音視頻數(shù)據(jù)包實(shí)現(xiàn)音視頻關(guān)鍵信息的及時(shí)無線傳送。為解決傳統(tǒng)音視頻通信系統(tǒng)不易適應(yīng)網(wǎng)絡(luò)狀況而降低服務(wù)質(zhì)量的問題提供了一種具有應(yīng)用價(jià)值的技術(shù)。 本文對通信機(jī)制、算法和模塊設(shè)計(jì)做了詳細(xì)的闡述,并對系統(tǒng)實(shí)現(xiàn)做了介紹。實(shí)際測試數(shù)據(jù)表明,系統(tǒng)已基本達(dá)到了設(shè)計(jì)功能,主要模塊已在中國電信全球眼金華網(wǎng)絡(luò)系統(tǒng)、義烏公交車站廣告系統(tǒng)中得到應(yīng)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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：TN919.8

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