【正文】 nd technology and radio munication technology has been an unprecedented development, while wireless infrared munication relative to the radio data munication has the advantages of low power consumption, low price, low electromagic interference, high confidentiality of. At present, the rapid development. Especially with development of coding and modulation techniques, wireless infrared data munication data rate bees higher and higher, as many mobile devices, indoor office equipment and handheld devices, wireless data munication is an important way. In the textbooks and materials we can know infrared is a short distance, high speed munication means of munication, for we often use a close quarters, indoor means of munication, the wireless infrared munication with wireless cable unmatched and beyond the advantage. System is introduced in this paper mainly expounds the working principle of infrared voice munication and infrared voice munication process, detailed analysis of the system design of each circuit module, the optimal design scheme of the system are obtained and successful as might do a better show design. This syste m is divided into 11 modules: voice acquisition module, the sending end of audio and power amplifier module, the sending end lowpass filter, infrared emitting circuit, an infrared receiving circuit, the receiver of voltage amplification module and so on. The infrared emission module is mainly used in diode, LM358 will receive the signal of the amplification and conversion of the long power of the signal amplification and infrared emission tube. In the infrared receiving module, the infrared receiving tube is mainly used, and the signal is amplified by LM386 and amplified by power. Keywords: infrared munication。其系統(tǒng)實現(xiàn)的功能是利用紅外發(fā)射管和紅外光接收管作為收發(fā)器件，將電信號傳至擴(kuò)音器和耳機。紅外線發(fā)射模塊中主要是采用二極管， LM358 將接收到的信號進(jìn)行電壓的放大和所轉(zhuǎn)化長的電信號功率的放大以及紅外線發(fā)射管。 本文介紹的系統(tǒng)主要闡述了紅外線語音通信的工作原理以及紅外線語音通信過程，詳細(xì)的分析了系統(tǒng)設(shè)計中的每一個電路模塊，得出了這一系統(tǒng)的最佳設(shè)計 方案，用做大的努力去完成一個比較好的設(shè)計。 本科畢業(yè)設(shè)計（論文） 題 目 紅外線語音通信系統(tǒng) 姓 名 專 業(yè) 通信工程 學(xué) 號 指導(dǎo)教師 信息工程學(xué)院 二 ○一 五 年 六 月 紅外線語音通信系統(tǒng) 目 錄 摘要 ............................................................................................................................... I Abstract ........................................................................................................................ II 前言 .............................................................................................................................III 1 紅外線語音通信系統(tǒng)的總體設(shè)計 .......................................................................... 1 紅外光通信系統(tǒng)的設(shè)計要求 ........................................................................ 1 語音采集所需要的環(huán)境 ...................................................................... 1 語音的采集 .......................................................................................... 1 控制和管理 .......................................................................................... 1 方案的提出與選擇 ........................................................................................ 2 總體設(shè)計思路 ................................................................................................ 4 發(fā)射部分電路設(shè)計 ........................................................................................ 6 發(fā)射部分框圖 ...................................................................................... 6 發(fā)射部分電路 ...................................................................................... 6 接收部分電路設(shè)計 ........................................................................................ 6 接收部分框圖 ...................................................................................... 6 接收部分電路 ...................................................................................... 7 2 基于紅外線的語音發(fā)送接收系統(tǒng)的模塊設(shè)計 ...................................................... 8 發(fā)送端語音采集電路 .................................................................................... 8 音頻放大電路的概述以及所用元件的介紹 ................................................ 9 使用到的元器件的介紹 ...................................................................... 9 放大電路 ............................................................................................ 11 發(fā)送端低通濾波器 ...................................................................................... 11 低通濾波器的概述 ............................................................................. 11 濾波電路 ............................................................................................ 12 紅外線發(fā)射與接收電路 .............................................................................. 12 接收端前級電壓放大電路 .......................................................................... 13 接收端有源低通濾波和有源高通濾波電路 .............................................. 14 LM386 功率放大電路 .................................................................................. 16 紅外線語音通信系統(tǒng) 概述 .................................................................................................... 16 功率放大的電路圖 ............................................................................ 18 揚聲器和耳機 ...............................................................