【摘要】：本文首先介紹了數(shù)字電視前端目前的發(fā)展現(xiàn)狀,指出了天塔數(shù)字電視前端的問題及其改造的必要性和重要性。其后對(duì)天塔前端的總體架構(gòu)、路由和各環(huán)節(jié)的設(shè)備、功能進(jìn)行了論述,包括信源、信號(hào)處理、混合分配三大環(huán)節(jié)。重點(diǎn)論述了信號(hào)處理環(huán)節(jié)的復(fù)用器、矩陣和CA系統(tǒng),以及相關(guān)理論知識(shí)和實(shí)際功能,如復(fù)用器在網(wǎng)管中的配置。在此基礎(chǔ)上,論文以解決現(xiàn)有系統(tǒng)存在的問題為目的,對(duì)增強(qiáng)系統(tǒng)擴(kuò)展性和復(fù)用器備份應(yīng)急兩方面進(jìn)行了針對(duì)性的分析,并提出解決辦法。在現(xiàn)有系統(tǒng)的基礎(chǔ)上,以最小的代價(jià),設(shè)計(jì)系統(tǒng)改造方案。包括臨時(shí)應(yīng)急系統(tǒng)的搭建,改造的思路與具體施工操作,復(fù)用器的升級(jí)方法和配置參數(shù)。之后,對(duì)網(wǎng)管控制、設(shè)備切換、系統(tǒng)參數(shù)調(diào)整、終端碼流等進(jìn)行測試,全面記錄測試目的、方法、數(shù)據(jù)和結(jié)論。在測試中,發(fā)現(xiàn)了設(shè)備切換速度慢和參數(shù)調(diào)整時(shí)加擾異常兩個(gè)重要隱患。分析問題,查找其中的原因,提出進(jìn)一步的解決辦法。再次改造系統(tǒng)的信號(hào)傳輸線路,并總結(jié)、規(guī)劃現(xiàn)有分配器和復(fù)用器的端口使用狀況。測試改造后的復(fù)用器、調(diào)制器切換速度,確保解決原有問題,并對(duì)測試進(jìn)行分析、總結(jié)。此次改造既增強(qiáng)了系統(tǒng)的應(yīng)急備份和擴(kuò)展性,又沒有破壞原系統(tǒng)的基礎(chǔ)結(jié)構(gòu)。在保證安全播出的前提下,提升了系統(tǒng)的綜合性能。以最小的代價(jià),延長了系統(tǒng)的生命周期。最后,本文對(duì)數(shù)字電視未來發(fā)展的前景和前端系統(tǒng)的技術(shù)趨勢做出了展望。
[Abstract]:This paper first introduces the current development of digital TV front end, and points out the problem of Tianta digital TV front end and the necessity and importance of its transformation. Then, the general architecture, routing and equipment functions of the front end of the tower are discussed, including information source, signal processing and mixed allocation. In this paper, the multiplexer, matrix and CA system of signal processing are discussed, as well as related theoretical knowledge and practical functions, such as the configuration of multiplexer in network management. On this basis, aiming at solving the problems existing in the existing system, the paper analyzes the two aspects of enhancing system expansibility and multiplexer backup emergency, and puts forward some solutions. On the basis of the existing system, with the minimum cost, design the system transformation scheme. It includes the construction of temporary emergency system, the train of thought and concrete construction operation, the upgrade method and configuration parameters of multiplexer. After that, the network management control, equipment switching, system parameter adjustment, terminal code stream and so on are tested, and the purpose, method, data and conclusion of the test are recorded. In the test, two important hidden dangers, slow switching speed of equipment and abnormal scrambling when parameters are adjusted, are found. Analyze the problem, find out the causes, and propose further solutions. The signal transmission line of the system is redesigned, and the port usage of the existing distributor and multiplexer is summarized and planned. The switching speed of the multiplexer and modulator after the test is improved to ensure that the original problem is solved, and the test is analyzed and summarized. The reconstruction not only enhances the emergency backup and expansibility of the system, but also does not destroy the original system infrastructure. Under the premise of ensuring safe broadcasting, the comprehensive performance of the system is improved. The life cycle of the system is extended at the lowest cost. Finally, the prospect of the future development of digital TV and the technical trend of front-end system are prospected.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN949.197

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