發(fā)布時間：2018-10-11 10:37

【摘要】：視頻技術(shù)依據(jù)信號類型可以分為模擬視頻技術(shù)和數(shù)字視頻技術(shù)兩大類,隨著數(shù)字處理技術(shù)以及微電子技術(shù)的快速發(fā)展,數(shù)字視頻技術(shù)在數(shù)據(jù)傳輸過程中的優(yōu)越性開始顯現(xiàn)出來,而模擬電視低成本,高還原性等優(yōu)點,使得模擬電視的普及率尤為可觀。然而數(shù)字電視取代模擬電視已經(jīng)成為一種趨勢,這種趨勢會使得模擬視頻信道出現(xiàn)閑置,進而會導(dǎo)致信道資源的極大浪費,這使得圖文電視技術(shù)應(yīng)運而生,圖文電視技術(shù)可以實現(xiàn)在視頻信道閑置的時候進行數(shù)字?jǐn)?shù)據(jù)傳送,大大改善了模擬視頻信道的傳輸效率。本文的研究內(nèi)容就是利用模擬視頻信道進行數(shù)字?jǐn)?shù)據(jù)傳輸。本文首先介紹了三種制式的視頻信號,通過其性能特點以及普及度確定所用電視制式,對三種制式視頻信號的傳輸過程進行研究,學(xué)習(xí)亮度信號與色差信號合成視頻信號的過程,提出利用視頻信號的亮度分量進行數(shù)據(jù)傳輸。參照奈奎斯特采樣定理以及發(fā)送端傳輸帶寬的限制,提出三種編碼方案,即基于電平檢測的數(shù)據(jù)編碼方案,基于邊沿檢測的數(shù)據(jù)編碼方案以及多進制調(diào)幅方案,經(jīng)過分析提出相應(yīng)的判決方案。其次,進行發(fā)送端與接收端的軟件設(shè)計,簡單介紹SOPC系統(tǒng)開發(fā)流程,包括NIOSII處理器的嵌入以及各宏功能模塊的添加,詳細介紹了發(fā)送端和接收端各功能模塊的設(shè)計以及作用。最后,詳細介紹硬件電路的搭建過程,包括存儲芯片,網(wǎng)絡(luò)芯片,視頻芯片等的外圍電路。利用搭建好的硬件電路進行數(shù)據(jù)收發(fā),通過對數(shù)據(jù)收發(fā)實驗結(jié)果進行分析,探究誤碼來源并提出改進方案,利用改進方案進行板級測試,最終得到在數(shù)據(jù)傳輸速率為2.88Mbit/s時,誤碼率低于10~(-4),達到技術(shù)指標(biāo)要求。
[Abstract]:Video technology can be divided into analog video technology and digital video technology according to signal type. With the rapid development of digital processing technology and microelectronics technology, the advantages of digital video technology in the process of data transmission begin to appear. Analog TV has the advantages of low cost and high reducibility, which makes the popularity of analogue TV especially remarkable. However, replacing analog TV with digital TV has become a trend, which will make analog video channel idle and lead to a great waste of channel resources, which makes teletext technology emerge as the times require. Graphic TV technology can realize digital data transmission when video channel is idle, which greatly improves the transmission efficiency of analog video channel. The research content of this paper is to use analog video channel for digital data transmission. In this paper, three kinds of video signal are introduced firstly, and the transmission process of the three kinds of video signal is studied through the characteristics of its performance and the TV system used to determine the popularity of the video signal. This paper studies the process of synthesizing video signal from luminance signal and chromatic difference signal, and proposes to transmit data by using brightness component of video signal. Referring to the Nyquist sampling theorem and the limitation of transmission bandwidth at the transmitter, three coding schemes are proposed, namely, the data coding scheme based on level detection, the data coding scheme based on edge detection, and the multi-ary amplitude modulation scheme. After analysis, the corresponding decision scheme is put forward. Secondly, the software design of the transmitter and receiver is carried out, and the development process of the SOPC system is introduced, including the embedding of the NIOSII processor and the addition of each macro function module. The design and function of each functional module in the transmitter and receiver are introduced in detail. Finally, the construction process of hardware circuit is introduced in detail, including the peripheral circuits of memory chip, network chip, video chip and so on. Through the analysis of the data transceiver experiment results, the source of error code is explored and an improved scheme is put forward. Finally, when the data transmission rate is 2.88Mbit/s, the improved scheme is used for board level test. The error rate is less than 10 ~ (- 4), which meets the technical requirements.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN919.8

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