基于模拟视频信道数据传输系统的研究

发布时间：2018-10-11 10:37

【摘要】：视频技术依据信号类型可以分为模拟视频技术和数字视频技术两大类,随着数字处理技术以及微电子技术的快速发展,数字视频技术在数据传输过程中的优越性开始显现出来,而模拟电视低成本,高还原性等优点,使得模拟电视的普及率尤为可观。然而数字电视取代模拟电视已经成为一种趋势,这种趋势会使得模拟视频信道出现闲置,进而会导致信道资源的极大浪费,这使得图文电视技术应运而生,图文电视技术可以实现在视频信道闲置的时候进行数字数据传送,大大改善了模拟视频信道的传输效率。本文的研究内容就是利用模拟视频信道进行数字数据传输。本文首先介绍了三种制式的视频信号,通过其性能特点以及普及度确定所用电视制式,对三种制式视频信号的传输过程进行研究,学习亮度信号与色差信号合成视频信号的过程,提出利用视频信号的亮度分量进行数据传输。参照奈奎斯特采样定理以及发送端传输带宽的限制,提出三种编码方案,即基于电平检测的数据编码方案,基于边沿检测的数据编码方案以及多进制调幅方案,经过分析提出相应的判决方案。其次,进行发送端与接收端的软件设计,简单介绍SOPC系统开发流程,包括NIOSII处理器的嵌入以及各宏功能模块的添加,详细介绍了发送端和接收端各功能模块的设计以及作用。最后,详细介绍硬件电路的搭建过程,包括存储芯片,网络芯片,视频芯片等的外围电路。利用搭建好的硬件电路进行数据收发,通过对数据收发实验结果进行分析,探究误码来源并提出改进方案,利用改进方案进行板级测试,最终得到在数据传输速率为2.88Mbit/s时,误码率低于10~(-4),达到技术指标要求。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN919.8

【相似文献】