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1、毕毕 业业 设设 计（论文）计（论文）半双工调频无线对讲机的设计Half duplex Design of a FM Radio 摘摘 要要随着现在通信技术的日新月异，各种通信设备层出不穷如电话，手机，对讲机等。半双工调频无线对讲机更是在日常生活中发挥着重要的作用，半双工对讲机系统具有使用简单、不受网络限制、通话成本低、适用范围广等优点。它是在鉴频混频等技术的基础上，利用无线电通信原理研发的一种通信方式本系统的功能在于实现呼叫和通话功能。无线对讲电话的特点是可供小型单位作内部电话使用，此外由于采用成品无线模块,从而使制作变得很简单,成本也很低。对讲电话实现了内部的通话，为人们的日常生活带来了极
2、大的方便，值得进一步推广，有很好的发展前景。电子技术的研究才刚刚开始，随着这项技术的研究逐渐深入，涉及的研究领域也将更广。希望这项技术的研究能为人们以后的生活、工作带来更大的便利，为人们提供更为舒适、完美的生活方式。本论文最后对对讲机的现状及发展前景进行分析。关键词关键词对讲机;半双工;调频Half duplex design of a FM radio Communication Engineering Major renleiAbstract: Now with the advances in communication technology，all kinds of communicat
3、ions equipment emerge in endlessly, such as telephone, mobile phone, interphone, etc. A half duplex radio have use wireless call system simple, not affected by network restrictions, call low cost, wide application, etc. It is popularly used in frequency mixing technology, on the basis of using radio
4、 communication principle of a kind of communication research. At present, people on the intercom research has from MoNiHua into digital.The function of this system is to realize call and call functions. The characteristics of wireless talkback telephone is available for small units for internal use,
5、 moreover due to the telephone finished product, thus make make wireless module becomes very simple, the cost is low. Talkback telephone calls, realized the internal for Peoples Daily life has brought great convenience and deserves further promotion, have very good prospects for development. Electro
6、nic technology research is just beginning, as the technology research, involving gradually goes deep research realm will be more widely. Hope this technology research for people later life, work bring greater convenience, to provide people with more comfortable and perfect way of life. This paper fi
7、nally to intercom current situation and development prospect were analyzed.Key words: Interphone; Half-duplex; Frequercy modulation目目 录录1 引言.11.1 半双工无线调频对讲机的目的和意义.2 1.2 半双工无线调频对讲机的应用.3 1.2.1 专业对讲机.3 1.2.2 民用对讲机.3 1.2.3 商用对讲机.3 1.2.4 业余对讲机.32 无线调频原理.43 系统总体概述及原理.53.1 工作原理图.5 3.2 工作原理.54 单元模块设计.54.1 混频.6 4.2 鉴频.8 4.2.1 乘积型鉴频器.9 4.2.2 锁相鉴频.10 4.3 集成选频放大器.11 4.4 锁相环的构成及工作原理.13 4.4.1 锁相环路的基本组成.13 4.4.2 锁相环锁相原理.14 4.4.3 集成锁相环 NE564 的介绍.15 4.5 音频功率放大电路.17 4.5.1 单调谐放大器.18 4.5.2 双调谐放大器.20 4.6 低通带通滤波器.20 4.7 调频.
