本文關(guān)鍵詞： 無線傳輸 嵌入式操作系統(tǒng) ARM9 Linux　出處：《山東大學》2013年碩士論文　論文類型：學位論文

【摘要】：隨著通訊技術(shù)和信息技術(shù)的發(fā)展,人們對通信設備的要求越來越高。人們越來越多的使用體積小巧、攜帶方便、功能強大的通信設備,無線傳輸方式與有線傳輸相比有著諸多優(yōu)點：無需架設電線,且覆蓋范圍廣,不受地理環(huán)境限制；語音信號的質(zhì)量很高,誤碼率很低；在出現(xiàn)故障時能快速找出原因,恢復正常運行；安全保密性能好。 首先,本文介紹了無線語音技術(shù)的發(fā)展現(xiàn)況,然后分別介紹了國內(nèi)外的發(fā)展狀況,以及本課題的意義和發(fā)展前景。其次,本文闡述了無線傳輸技術(shù)的發(fā)展歷程；簡單介紹了語音壓縮編碼的發(fā)展歷史、研究現(xiàn)狀和常用的壓縮編碼算法,并分析了語音編碼算法的一般原理、分類及其不同的實現(xiàn)方法。本文給出了一種無線語音傳輸系統(tǒng)的設計思路及實現(xiàn)方案、描述了項目背景和應用價值,同時根據(jù)項目的需求選擇出使用的芯片：在種類眾多的處理器中選出ARM9系列超低功耗處理器；ARM9具有高度可編程性、高性能、低功耗、可以選擇性的外圍器件搭配、語音芯片使用uda1380tt-MD立體聲音頻編碼解碼器；以及專為在433MHz ISM(工業(yè)、科研和醫(yī)療)頻段工作而設計的KH-WKTKIE-465PV大功率收發(fā)芯片。根據(jù)這些芯片資料繪制出原理圖與PCB圖。 最后,描述了本文的軟件平臺嵌入式Linux操作系統(tǒng),Linux是一種自由和開放源碼的類Unix操作系統(tǒng),存在著許多不同的Linux版本,但它們都使用了Linux內(nèi)核。Linux可以在各種計算機硬件設備中被安裝,比如常見的手機、平板電腦、路由器、視頻游戲控制臺、或者臺式機、大型機以及超級計算機等。Linux是領先的一個操作系統(tǒng),在世界上,運算速度最快的10臺超級計算機內(nèi)部,使用的都是Linux操作系統(tǒng)。 針對以上的需求分析,展現(xiàn)出無線語音播報的市場潛力。本論文主要完成了以下幾方面工作： 1、無線語音播報的硬件設計。包括硬件平臺的總體規(guī)劃、硬件的選型與搭配、硬件實施方案。 本系統(tǒng)硬件主要有兩大部分組成,一部分是CPU核心模塊--信息處理部分,另一部分是無線發(fā)射模塊-信號發(fā)射部分。 硬件平臺采用以AT91RM9200為核心的處理器,外圍設備通過擴展板與處理器連接,設備與處理器之間的數(shù)據(jù)傳遞通過串口交換,CPU進行任務調(diào)度。 信息處理部分用于接收上位機的信息,并將接收的信息進行分類和處理,把接收到的需要播放的信息分析出來,找到對應的語音文件進行合成,最后將合成的語音文件通過聲卡播放出來。 信號發(fā)射部分將上一部分通過聲卡播放的聲音通過無線模塊以無線廣播的模式發(fā)射出去,執(zhí)法人員通過對講機接收語音信息。 2、無線語音播報的軟件設計。包括Linux系統(tǒng)下的應用程序開發(fā)、硬件驅(qū)動開發(fā)。 本系統(tǒng)運行的軟件平臺為LINUX操作系統(tǒng),完成了在Linux下基于C語言的應用程序開發(fā)；另外牽扯到控制的許多硬件都需要底層驅(qū)動,比如串口、GPIO、音頻等等,在系統(tǒng)的開發(fā)過程中完成了以上底層驅(qū)動的開發(fā)。 3、通過實地測試,諸如青島膠州灣大橋超載超限檢測站、國道G104瓷窯超載超限檢測站、廣州丫髻沙大橋超載超限檢測站等治超站的現(xiàn)場使用,也驗證了該產(chǎn)品的可行性。 最后,對系統(tǒng)的未來發(fā)展進行了展望。
[Abstract]:With the development of communication technology and information technology , the demand of communication equipment is getting higher and higher . Firstly , this paper introduces the status of the development of wireless voice technology , then introduces the development history of wireless transmission technology , the significance and development prospect of wireless transmission technology . Secondly , this paper describes the development history of the wireless transmission technology , the research situation and the common compression coding algorithm , and analyses the general principle , classification and implementation methods of the speech coding algorithm . Finally , we describe the embedded Linux operating system of the software platform , Linux is a kind of free and open source class Unix operating system , there are many different versions of Linux , but they all use the Linux kernel . Linux can be installed in various computer hardware devices , such as common mobile phones , tablets , routers , video game consoles , or desktops , mainframe computers , supercomputers , etc . Linux is the leading operating system , in the world , the fastest operating systems in the world are Linux operating systems . Aiming at the above demand analysis , this paper presents the market potential of wireless voice broadcasting . This paper mainly accomplishes the following aspects : 1 . Hardware design of wireless voice broadcasting . It includes the master plan of hardware platform , the selection and matching of hardware and implementation of hardware . The hardware of the system mainly consists of two parts , part of which is the CPU core module - information processing part , and the other part is the wireless transmission module - signal transmitting part . The hardware platform adopts AT91RM9200 as the core processor , the peripheral equipment is connected with the processor through the expansion board , and the data between the equipment and the processor is exchanged through the serial port , and the CPU performs task scheduling . the information processing part is used for receiving the information of the upper computer and classifying and processing the received information , analyzing the received information needed to be played , finding the corresponding voice file for synthesizing , and finally playing the synthesized speech file through the sound card . and the signal transmitting part transmits an upper part of the sound through the sound card to be transmitted through the wireless module in a wireless broadcast mode , and the law enforcement personnel receives the voice information through the intercom . 2 . Software design of wireless voice broadcasting , including application development and hardware drive development under Linux system . The software platform running on the system is the Linux operating system , and the development of the application program based on C language under Linux is completed , and many hardware involved in the control needs to be driven by the bottom layer , such as serial port , GPIO , audio and so on , and the development of the above bottom layer drive is completed during the development of the system . 3 . The feasibility of the product is also verified by field testing , such as the overload detection station of Qingdao Jiazhou Bay Bridge , the overload detection station of G104 porcelain kiln of Gudao , the overload detection station of Guangzhou Lajishan Bridge , etc . , and the feasibility of the product . Finally , the future development of the system is forecasted .

【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TN912.3;TP368.1

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