【摘要】：良好的語音廣播系統(tǒng),在煤礦日常生產(chǎn)、設(shè)備安裝、調(diào)試、檢修和救災(zāi)過程中,發(fā)揮著至關(guān)重要的作用,如在煤礦災(zāi)害發(fā)生初期,通過語音廣播系統(tǒng)能夠及時指導(dǎo)現(xiàn)場人員進(jìn)行避險撤離。當(dāng)前煤礦語音廣播系統(tǒng)多為定壓廣播、調(diào)度電話等模式,局限性較大,更無法實現(xiàn)半雙工或全雙工對講功能。針對當(dāng)前煤礦語音廣播系統(tǒng)的不足,本課題提出了基于以太網(wǎng)(Ethernet)和CAN總線的煤礦數(shù)字語音廣播系統(tǒng)的研究與設(shè)計。該系統(tǒng)不僅能在事故發(fā)生時,發(fā)起全網(wǎng)緊急廣播,引導(dǎo)科學(xué)避險,而且可在日常生產(chǎn)過程中作為基本聯(lián)絡(luò)及豐富職工文化生活的有力工具。根據(jù)煤礦語音廣播系統(tǒng)的應(yīng)用特點,本課題研究設(shè)計以Ethernet為核心,輔以CAN總線、嵌入式等技術(shù)來構(gòu)建整套數(shù)字語音廣播系統(tǒng)。首先介紹了Ethernet和CAN總線在語音傳輸方面的應(yīng)用研究現(xiàn)狀及語音傳輸關(guān)鍵技術(shù),論證了Ethernet和CAN總線在音頻傳輸方面的可行性。緊接著論述了系統(tǒng)的整體方案,對音頻服務(wù)器和系統(tǒng)廣播終端(廣播主站和分站)的功能需求和硬件設(shè)計進(jìn)行了詳細(xì)闡述。針對Ethernet和CAN總線的協(xié)議特點,構(gòu)建了語音傳輸系統(tǒng)的M/D/1排隊數(shù)學(xué)模型,利用MATLAB對該模型進(jìn)行了仿真,并對仿真結(jié)果進(jìn)行了深度分析。針對音頻傳輸?shù)膶崟r性特點,分別論述了動、靜態(tài)緩沖控制機(jī)制的工作原理及設(shè)計過程,并試著提出了一種基于音質(zhì)控制的自適應(yīng)去抖動同步策略。最后詳細(xì)論述了基于VS2010平臺的音頻服務(wù)器和基于μC/OS-II實時操作系統(tǒng)的廣播終端軟件的開發(fā)過程�；诖罱ǖ臏y試平臺,對流媒體播放、單向、雙向、多路和多路雙向語音傳輸進(jìn)行了實驗研究,實驗驗證了相關(guān)控制理論和軟硬件技術(shù)的正確性。
[Abstract]:A good voice broadcasting system plays an important role in daily production, equipment installation, commissioning, maintenance and disaster relief in coal mines, such as in the early days of coal mine disasters. Through the voice broadcast system can timely guide site personnel to evacuate risk. At present, the voice broadcasting system in coal mine is mostly the mode of constant voltage broadcasting, dispatching telephone and so on, which has great limitation and can not realize half-duplex or full-duplex intercom function. Aiming at the deficiency of current coal mine voice broadcasting system, this paper presents the research and design of coal mine digital voice broadcasting system based on Ethernet (Ethernet) and CAN bus. The system can not only launch the emergency broadcast on the whole network when accidents occur, guide the science to avoid risks, but also serve as a powerful tool for basic contact and enrich the cultural life of workers in daily production. According to the application characteristics of coal mine voice broadcasting system, this paper studies and designs a whole digital voice broadcasting system based on Ethernet, CAN bus and embedded technology. Firstly, the application and research status of Ethernet and CAN bus in voice transmission and the key technology of voice transmission are introduced, and the feasibility of Ethernet and CAN bus in audio transmission is demonstrated. Then the overall scheme of the system is discussed, and the functional requirements and hardware design of the audio server and the broadcast terminal (the broadcast master station and the sub-station) are described in detail. According to the protocol characteristics of Ethernet and CAN bus, a mathematical model of M/D/1 queuing for speech transmission system is constructed. The model is simulated by MATLAB, and the simulation results are analyzed in depth. In view of the real-time characteristics of audio transmission, the working principle and design process of dynamic and static buffering control mechanism are discussed, and an adaptive de-jitter synchronization strategy based on sound quality control is proposed. Finally, the development process of audio server based on VS2010 platform and broadcast terminal software based on 渭 C/OS-II real-time operating system is discussed in detail. Based on the test platform, experimental research on streaming media playback, one-way, two-way, multi-channel and multi-channel two-way voice transmission is carried out. The experiment verifies the correctness of the relevant control theory and software and hardware technology.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD65

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本文編號：2460202