本文選題：圖文電視 + 解碼器　； 參考：《電子科技大學(xué)》2012年碩士論文

【摘要】：Teletext是一種在不增加額外帶寬的基礎(chǔ)上，在電視頻道中傳輸一些文字和簡單圖像信息的標(biāo)準(zhǔn)。在此標(biāo)準(zhǔn)下，電視服務(wù)提供商可以在電視信號中提供節(jié)目導(dǎo)航信息，生活服務(wù)信息，即時新聞，廣告等。 本論文主要針對歐洲EN ETSI300706（V1.2.1）標(biāo)準(zhǔn)，討論研究如何解碼模擬電視中的teletext信息，并對解碼器在系統(tǒng)中的集成進(jìn)行了說明，對teletext存儲格式和字符替換功能進(jìn)行了創(chuàng)新性的研究。主要內(nèi)容有： 1.分析了該課題的研究意義和背景，對國內(nèi)外的研究現(xiàn)狀做了介紹。詳細(xì)研究了EN ETSI300706（V1.2.1）標(biāo)準(zhǔn)中的teletext level1.5。介紹了在EN ETSI300706標(biāo)準(zhǔn)中，teletext信號的傳輸形式和每行信號的規(guī)定格式。參照EN ETSI300706標(biāo)準(zhǔn)對teletext level1.5中的每個packet的編碼方式進(jìn)行了描述，對每個packet中包含的內(nèi)容進(jìn)行了說明，并分析內(nèi)容是否可用。對packet之間的信息關(guān)系進(jìn)行了分析，概括了每個packet信息的影響范圍。 2.詳細(xì)論述了解碼器的實現(xiàn)。首先介紹了解碼器的整體架構(gòu)，討論了解碼的思路和方法，說明了子模塊的組成和子模塊間數(shù)據(jù)的流向。按照每個packet的編碼方式和信息的可用性介紹了packet解碼子模塊對每個packet的解碼過程。討論了解碼器在teletext三種編碼方式下的解碼及糾錯方法。介紹了數(shù)據(jù)解析子模塊對解碼后每個packet的數(shù)據(jù)的處理過程，其中詳細(xì)介紹了數(shù)據(jù)解析子模塊對包含字符替換功能的packet26包含的信息的重構(gòu)，以及該過程下模塊中相關(guān)邏輯的時序。在介紹存儲控制模塊時，討論了數(shù)據(jù)解析模塊處理后各個packet信息的存儲方式，存儲位置和輸出數(shù)據(jù)到mem中的時序。對整個teletext數(shù)據(jù)在M EM中的存儲空間的劃分進(jìn)行了說明。解釋了在用戶切換當(dāng)前顯示頁的情況下存儲空間如何在原有存儲內(nèi)容上進(jìn)行較少改動的更新的滾動存儲的機(jī)制。 3.論文給出了解碼器的仿真結(jié)果，，對仿真環(huán)境及仿真所用的工具進(jìn)行了說明。截取了部分仿真波形，并參照解碼器的設(shè)計對波形進(jìn)行了簡單的解釋。 4.最后討論了解碼器在電視系統(tǒng)中的集成，給出了一般情況下集成teletext解碼模塊的電視系統(tǒng)的結(jié)構(gòu)圖。對解碼器前將數(shù)字信號的teletext正弦波信號轉(zhuǎn)換為0/1非歸零二進(jìn)制碼的采樣模塊做了可行的建議。對論文討論的內(nèi)容進(jìn)行了總結(jié)，并對解碼器以后的發(fā)展進(jìn)行了展望。
[Abstract]:Teletext is a standard for transmitting text and simple image information on TV channels without additional bandwidth. Under this standard, TV service providers can provide program navigation information, life service information, instant news, advertising and so on. This paper mainly aims at European en ETSI300706 (V1.2.1) standard, discusses how to decode teletext information in analog TV, explains the integration of decoder in the system, and makes innovative research on teletext storage format and character replacement function. The main contents are: 1. The significance and background of the research are analyzed, and the present situation of the research at home and abroad is introduced. The teletext level of en ETSI300706 (V1.2.1) is studied in detail. In en ETSI300706 standard, the transmission form of teletext signal and the prescribed format of each line signal are introduced. According to en ETSI300706 standard, the encoding method of each packet in teletext level1.5 is described, the contents contained in each packet are described, and whether the content is available or not is analyzed. The information relationship between packet is analyzed, and the influence range of each packet information is summarized. 2. 2. The implementation of decoder is discussed in detail. Firstly, the whole architecture of the decoder is introduced, the idea and method of decoding are discussed, and the composition of the sub-module and the flow direction of the data between the sub-modules are explained. According to the encoding method of each packet and the availability of information, the decoding process of each packet by packet decoding submodule is introduced. The decoding and error-correcting methods of decoders in three teletext coding modes are discussed. This paper introduces the process of data processing of each packet after decoding by the data parse submodule, including the reconfiguration of the information contained by the packet26 containing character replacement function, and the timing of the related logic in the module. When introducing the storage control module, the storage mode, storage location and the timing of the output data to the mem after the processing of each packet information by the data parsing module are discussed. The partition of storage space of the whole teletext data in M-EM is described. This paper explains how to update the rolling storage mechanism of storage space with less changes on the original storage content in the case of user switching the current display page. The simulation results of the decoder are given, and the simulation environment and simulation tools are described. Some simulated waveforms are intercepted, and the waveform is explained simply according to the design of decoder. 4. Finally, the integration of decoder in TV system is discussed, and the structure diagram of TV system integrated with teletext decoding module is given. Some feasible suggestions are made for the sampling module which converts the teletext sinusoidal signal of the digital signal to 0 / 1 non-return-to-zero binary code before the decoder. The contents of this paper are summarized and the future development of decoder is prospected.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TN949.27;TN764

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