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廣西大學(xué)學(xué)士學(xué)位論文 智能音視頻切換器I摘 要本文介紹的是四選一智能音視頻切換器,可以實(shí)現(xiàn) 4 路音頻,4 路視頻輸入,并從 4 路輸入信號(hào)中選擇 1 路有效的信號(hào)送到輸出端(包括 1 路音頻、1 路視頻信號(hào)輸出) 。本切換器采用單片機(jī) AT89S52 作為系統(tǒng)微控制器。在手動(dòng)狀態(tài)下,可由開(kāi)關(guān)控制,手動(dòng)切換任意輸入的音視頻信號(hào)至輸出端;在自動(dòng)狀態(tài)下,通過(guò)單片機(jī)對(duì)各路輸入信號(hào)的檢測(cè),智能的選出一路正常的音視頻信號(hào)作為輸出信號(hào)。該切換器具備可設(shè)置時(shí)間表,通過(guò)單片機(jī)使其能工作時(shí)間自動(dòng)工作。在無(wú)正常信號(hào)時(shí),可自動(dòng)報(bào)警。選擇可用信號(hào)的當(dāng)前切換通道可在 LCD 顯示屏上動(dòng)態(tài)顯示。且該切換器具備以太網(wǎng)接口(獨(dú)立 IP 地址) ,并可通過(guò)以太網(wǎng)連接上位計(jì)算機(jī)。通過(guò)上位機(jī)進(jìn)行系統(tǒng)參數(shù)配置,并監(jiān)測(cè)和控制系統(tǒng)的工作狀態(tài)。無(wú)上位機(jī)時(shí),系統(tǒng)可獨(dú)立工作。該切換器設(shè)計(jì)的特點(diǎn)是具備手動(dòng)和自動(dòng)切換,能夠智能選擇控制輸出,硬件結(jié)構(gòu)簡(jiǎn)單,方便易用。 關(guān)鍵詞: 音視頻切換 單片機(jī) AT89S52 LCD 顯示 智能選控廣西大學(xué)學(xué)士學(xué)位論文 智能音視頻切換器IISmart Audio Video SwitcherAbstractThis article describes the four selected audio and video of a smart switch allows 4channel audio, 4 video inputs, and input signal from 4 to select a way of effective signal to the output (including 1 channel audio, 1 channel video signal output). The switch used as a system microcontroller AT89S52 microcontroller. In manual mode, controlled by the switch to manually switch any input to output audio and video signals。 in the automatic mode, through the microcontroller on the alto signal detection, intelligent elected the way of normal audio and video signals as output signals. The switch has to set a timetable to let them work through the MCU time to work automatically. In the absence of normal signal, the alarm automatically. Select available signal current switch channel dynamic display in LCD display. And the switch with Ether interface (separate IP address), and can host puter via an Ether connection. Of system parameters through the PC configuration, and monitoring and control system working state. Without PC, the system can work independently. The design of switch is characterized with manual and automatic switching, intelligent choice to control the output, hardware structure is simple, easy to use.Key Words: Audio and video switching MCU AT89S52 LCD display Intelligent Choice and Control廣西大學(xué)學(xué)士學(xué)位論文 智能音視頻切換器III目 錄摘 要 ...........................................................IABSTRACT .......................................................II第 一 章 引 言 .................................................1 研究背景及意義 ...........................................1 本文的選題和研究?jī)?nèi)容 .....................................1第 二 章 智能音視頻切換器硬件設(shè)計(jì)方案及步驟 .....................2 系統(tǒng)硬件整體設(shè)計(jì)思路 .....................................2 硬件整體構(gòu)成 .............................................2 本章小結(jié) .................................................4第 三 章 智能音視頻切換器的硬件電路設(shè)計(jì) .........................4 中央處理模塊 .............................................5 AT89S52 功能特性介紹 ...................................5 AT89S52 引腳結(jié)構(gòu)功能介紹 ...............................6 AT89S52 空閑模式和掉電模式 .............................8 中央處理模塊原理分析 ...................................9 時(shí)鐘模塊設(shè)計(jì) ............................................12 芯片 DS3231 介紹 .......................................12 原理分析 ..............................................15 報(bào)警模塊設(shè)計(jì) ............................................16 顯示模塊設(shè)計(jì) ............................................16 1602LCD 介紹 ..........................................17 LCD 原理圖分析 ........................................18 音頻切換模塊設(shè)計(jì) ........................................18 芯片 M309 介紹 .........................................21 芯片 DS1808 介紹 .......................................22廣西大學(xué)學(xué)士學(xué)位論文 智能音視頻切換器IV 視頻切換模塊設(shè)計(jì) ........................................24 芯片 MAX7450 介紹 ......................................25 芯片 MAX4314 介紹 ......................................25 網(wǎng)絡(luò)接口模塊設(shè)計(jì) ........................................26 芯片 EN28J60 介紹 ......................................28 本章小結(jié) ................................................28第 四 章 總結(jié)與展望 ............................................29參考文獻(xiàn) .......................................................29致 謝 .........................................................31廣西大學(xué)學(xué)士學(xué)位論文 智能音視頻切換器0第 一 章 引 言 研究背景及意義電視臺(tái)播出電視信號(hào)時(shí),常因?yàn)樵O(shè)備故障、自然氣候影響或人為失誤等原因造成加到發(fā)射機(jī)的圖像信號(hào)衰落或中斷,這對(duì)安全優(yōu)質(zhì)播出和發(fā)射設(shè)備的不良影響是不言而喻的。視頻自動(dòng)切換報(bào)警電路是在發(fā)生圖像信號(hào)衰落或中斷