摘  要

公众无线移动通信和专网移动无线通信同属于移动通信的范畴，是移动通信的两大应用领域。目前，它广泛用于保安巡逻、野外工程、生产建设等领域。随着对讲机进入民用市场，人们在外出旅游越来越多地使用对讲机。对讲的发射部分采用三级放大电路组成,第一级为话筒放大电路，第二级为振荡兼放大电路，第三级为发射部分。对讲机的用途很广泛，发送原理是把音频信号转换成电信号,再通过调制之后利用特定的频率范围发送出去。接收是利用接收器对特定的频率范围之内收到的信号通过解调之后通过扬音器发出收到的信息声音。本系统是在鉴频、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。目前，人们对对讲机的研究已从模拟化转化为数字化。基于无线电的基本原理，分析了各部分的作用和功能，研究、确定对讲机电路图。

关键词：无线，对讲系统；通信；电路；仿真

Abstract

Public wireless mobile communication and private network mobile wireless communication belong to the category of mobile communication, and are two major application fields of mobile communication.At present, it is widely used in security patrols, field engineering, production and construction fields.As walkie-talkies enter the civilian market, walkie-talkies are increasingly used for travel.The transmission part is composed of three stage amplifier circuit, the first stage is microphone amplifier circuit, the second stage is oscillating and amplifying circuit, and the third stage is transmitter part.Interphone is widely used. The principle of transmission is to convert audio signal into electric signal, and then transmit it by modulation in a specific frequency range.Receiving is profit The signal received by a receiver on a specific frequency range is transmitted through the demodulator to send out the received information. This system is a communication mode developed on the basis of frequency discrimination, mixing and other techniques, using the principle of radio communication. At present, the research of the interphone has been transformed from analog to digitized. The basic principle of radio is analyzed, the functions and functions of each part are analyzed, and the circuit diagram of interphone is determined.

Keywords: wireless, intercom system; Communication; Circuit; Simulation

目  录

摘  要I

AbstractII

第1章 绪论1

1.1选题背景意义1

1.2研究现状1

1.3无线对讲系统概述2

1.3.1对讲信号处理单元结构2

1.3.2对讲传输系统2

1.4研究内容3

第2章 无线对讲系统硬件电路设计4

2.1无线对讲发送部分的设计4

2.2.1前置放大电路的设计4

2.1.2抗混叠滤波器的设计9

2.1.3 A/D转换和无线对讲串行发送的设计15

2.2无线对讲接收部分的设计17

2.2.1无线对讲串行接收的设计17

2.2.2D/A转换电路和平滑滤波器的设计18

2.2.3功率放大器的设计21

第3章 无线对讲系统软件程序设计26

3.1无线对讲发送部分的仿真和调试26

3.1.1前置放大电路的仿真和调试26

3.1.2抗混叠滤波器的仿真和调试27

3.1.3 A/D转换电路的仿真和调试28

3.1.4无线对讲串行发送设计的仿真和调试31

3.2无线对讲接收部分的仿真和调试33

3.2.1无线对讲串行接收的仿真和调试33

3.2.2 D/A转换电路的仿真和调试37

3.2.3平滑滤波器的仿真和调试38

3.2.4功率放大器的仿真和调试39

3.3无线对讲系统整体仿真和调试39

第4章 制作与调试44

4.1无线对讲发送部分的测试和结果44

4.1.1前置放大电路的测试和结果44

4.1.2抗混叠滤波器的测试和结果48

4.1.3 A/D转换电路的测试和结果53

4.1.4无线对讲串行发送的测试和结果58

4.2无线对讲接收部分的测试和结果61

4.2.1无线对讲串行接收的测试和结果61

4.2.2 D/A转换电路的测试和结果68

4.2.3平滑滤波器的测试和结果70

4.2.4功率放大器的测试和结果70

结  论73

致  谢74

参考文献75

附  录76