目 錄摘 要...........................................................................................................................1 關(guān)鍵詞.........................................................................................................................1 Abstract ......................................................................................................................1 Key words .................................................................................................................... 21 前言........................................................................................................................2 1.1 選題的目的與意義 ...................................................................................... 2 1.2 簡述模擬信號(hào)與數(shù)字信號(hào) ........................................................................... 22 設(shè)計(jì)任務(wù)與要求.................................................................................................... 2 2.1 設(shè)計(jì)任務(wù) ...................................................................................................... 2 2.2 基本要求 .................................................................................................... 33 總體方案設(shè)計(jì)與方案論證.................................................................................... 3 3.1總體方案設(shè)計(jì) ............................................................................................... 3 3.2 方案論證與選擇 .......................................................................................... 4 3.2.1 無線傳輸方式的選擇 ........................................................................ 4 3.2.2 模數(shù)轉(zhuǎn)換 ............................................................................................ 44 硬件電路與軟件設(shè)計(jì)的實(shí)現(xiàn).............................................................................. 8 4.1 硬件電路的實(shí)現(xiàn) ........................................................................................ 8 4.1.1 控制處理器外圍電路 ...................................................................... 10 4.1.2 紅外發(fā)射電路的實(shí)現(xiàn) ...................................................................... 10 4.1.3 模數(shù)轉(zhuǎn)換電路的實(shí)現(xiàn) ...................................................................... 10 4.2 軟件設(shè)計(jì) .................................................................................................... 11 4.2.1 發(fā)射機(jī)軟件設(shè)計(jì) .............................................................................. 115 系統(tǒng)調(diào)試與調(diào)試中的問題.................................................................................. 12 5.1 模數(shù)轉(zhuǎn)換的調(diào)試 ........................................................................................ 12 5.2 紅外發(fā)射接收的調(diào)試 ................................................................................ 12參考文獻(xiàn).................................................................................................................. 13附 錄........................................................................................................................ 13 附錄1 發(fā)射機(jī)程序 ................................................................................ 13模擬信號(hào)數(shù)字無線傳輸系統(tǒng)的設(shè)計(jì)摘 要通信系統(tǒng)分為模擬通信系統(tǒng)和數(shù)字通信系統(tǒng)，如果我們?cè)诎l(fā)送端的信息源中包括一個(gè)模/數(shù)轉(zhuǎn)換裝臵，在接收端包括一個(gè)數(shù)/模轉(zhuǎn)換裝臵，在發(fā)送端與接收端之間通過紅外作為載波進(jìn)行通信，則可以實(shí)現(xiàn)模擬信號(hào)數(shù)字無線傳輸。

本文主要從三個(gè)方面進(jìn)行設(shè)計(jì)與實(shí)現(xiàn)：（1）AT89S51單片機(jī)對(duì)A/D轉(zhuǎn)換器的控制，從而對(duì)模擬信號(hào)進(jìn)行抽樣、量化、編碼后轉(zhuǎn)換為數(shù)字信號(hào)；（2）單片機(jī)對(duì)數(shù)字信號(hào)進(jìn)行編碼與38Khz紅外載波調(diào)制通過紅外線發(fā)射；（3）接收機(jī)接收到的調(diào)制信號(hào)經(jīng)紅外接收頭進(jìn)行解調(diào)還原數(shù)字信號(hào)，再經(jīng)單片機(jī)的處理，通過D/A，以及信號(hào)的放大，最后再經(jīng)過低通濾波器還原成模擬信號(hào)，從而實(shí)現(xiàn)模擬信號(hào)數(shù)字無線傳輸演示的全過程關(guān)鍵詞:模擬信號(hào)數(shù)字傳輸；無線傳輸；紅外通信；模數(shù)轉(zhuǎn)換Analog Digital Wireless Transmission Communication SystemAbstract Communication system is divided into analog communication systems and digital communication systems, if we send the client's information sources include a A / D converter, the receiver includes a D / A converter, in between the transmitter and the receiver as by infrared carrier to communicate, you can transmit analog signal digital infrared communications. This article mainly focuses on three aspects: (1) AT89S51 microcontroller on the A / D chip to control the analog signal sampling, quantization, encoded into digital signals; (2) single chip digital signal processing and modulation 38KHZ IR through infrared emission; (3) base station receives the first modulated signal by the infrared receiver to demodulate digital signal reduction by the microcontroller processing, through the D / A, and signal amplification and finally through the reduction of low-pass filter into an analog signal, in order to achieve different place communication. Key words: Analog signal digital transmission ；wireless transmission ；infrared communication ；analog _digital conversion 1 前言1.1 選題的目的與意義 移動(dòng)通信是現(xiàn)代通信技術(shù)和計(jì)算機(jī)技術(shù)高度發(fā)展和緊密結(jié)合的產(chǎn)物。

隨著數(shù)字化信息技術(shù)的廣泛應(yīng)用，現(xiàn)代通訊技術(shù)正以前所未有的高速度發(fā)展著，其龐大的信息傳輸工程則主要依靠于數(shù)字通信技術(shù)因此，模擬信號(hào)通過數(shù)字傳輸已成為當(dāng)今發(fā)展的趨勢現(xiàn)在很多的通信實(shí)驗(yàn)設(shè)備都忽視了讓人清晰直觀的了解信號(hào)在整個(gè)通信系統(tǒng)中是怎樣轉(zhuǎn)換和傳輸?shù)模瑢?dǎo)致很多人做了通信實(shí)驗(yàn)后仍對(duì)信號(hào)轉(zhuǎn)換傳輸?shù)恼麄€(gè)過程感到模糊本系統(tǒng)從模擬信號(hào)的輸入波形、模擬信號(hào)轉(zhuǎn)換成數(shù)字信號(hào)再進(jìn)行調(diào)制的波形、接收解調(diào)后的波形到最后接收機(jī)還原模擬信號(hào)的波形都能夠清晰直觀的看到，使人更加深刻的了解模擬信號(hào)數(shù)字無線傳輸?shù)恼麄€(gè)過程，達(dá)到一個(gè)演示的目的所以，對(duì)于本選題，我覺得意義重大，有必要也有實(shí)際需要把它做出來展現(xiàn)給大家，讓人更加直觀的看到模擬信號(hào)數(shù)字無線傳輸。