广播录放盘的主控板设计

文档编号:DQ119   文档字数:8665,页数:28

摘要
  随着社会的进步和科技的发展，人们的生活水平和生活要求也逐渐提高，对各类产品的功能以及性价比的要求越来越高，只有适合消费者生活需求的产品才能得到认可。从而对广播录放盘也提出了新的功能要求，需要创新和发展才能适应需求。HGT2212/HGT2222 广播录放盘是应急广播系统中的前置音源及系统启动中心控制设备。HGT2212背景音乐为磁带，HGT2222 背景音乐为CD/MP3，两种皆有与联动设备的接口。录放盘采用电子固态录音方式做为事故广播和录音。该系列产品在设计时本着保证紧急状态下的可靠工作，同时注重正常背景广播的原则，增加了许多实用性很强的功能，如悦耳的钟声进入、背景音量渐进控制等功能。而最具特色的是：该系列产品配合两套功放产品实现同一时间下紧急广播和背景广播同时播放的功能，既完成了事故区域的指挥疏散任务，又保持了非事故区安静祥和的气氛。在本毕业文档通过这个项目的开发过程，研究并设计广播录放盘CD机和语音播放部分电路，实现二路信号的合成。并根据消防广播的功能技术达到能在紧急状态下播放报警语音，停止CD播放的协调工作的目的。
 
关键词： 广播；合成；报警；协调

Abstract
Along with social progress and technological development, people's living standards and gradually improve the living requirements for different categories of product features and the requirements of increasingly high price, only suited to the needs of consumers living products can be approved. Thus the recording was also broadcast a new functional requirements, the need to adapt to innovation and development needs.HGT2212/HGT2222 broadcasting recorder is the pre-launch audio resource and the central controlling equipment of the emergency broadcasting system. The background music of HGT2212 is played by tape and the background music of HGT2222 is played by CD or MP3, both of them have an interface with the linkage device. The recorder uses the solid-state electronic recording mode for broadcasting and recording incidents. On the principles of ensuring a normal performance in case of emergency as well as focusing on ordinary broadcastings, this series of products are added a number of practical features, namely nice bell-sound entry, background incremental volume control and so on. Among them the most characteristic one is-- with two sets of power amplifiers this series of products can make an emergent broadcasting and a backgroud broadcasting at the same time, so that not only the command mission of evacuation in incident region can be achieved, but also a tranquil and peaceful atmosphere in non-accident areas can be mantained.In this thesis through the project development process, research and design of radio-CD players and recorders voice player of the circuit, and Second Road signal synthesis. According to the Fire Services and the functions of broadcasting technology can achieve a state of emergency in the voice alarm player, CD player stopped the coordination of work.
 
Key words:  Broadcasting; Synthesis; Alarm; Coordina

目 录
摘要 I
Abstract II
1  绪 论 1
1.1  背景 1
1.2  任务和目标 1
2  录放机功能特性 2
2.1 功能特性 2
2.2 主要技术指标 3
2.3  技术参数 3
3  总体设计方案 4
3.1  系统总体结构 4
3.2 模块功能 5
3.2.1主控制模块 5
3.2.2 副控制模块 6
3.2.3 信号输出模块 8
4  原理图设计 9
4.1 软件的选择及其使用环境 9
4.1.1 protel软件介绍 9
4.1.2 电路设计的概念 9
5  硬件设计 11
5.1 芯片选择 11
5.1.1 AT89C51单片机 11
5.1.2 AT89C2051单片机 12
5.1.3 SN74HC164N串入并出8位移位寄存器 13
5.1.4 ISD4002系列 2-8分钟单片语音录放电路 13
 5.1.5 LM386音频放大芯片 16
6  成果 19
6.1 总体设计原理图 19
6.2 外部形状 20
7  文档总结 22
致  谢 23
参考文献 24

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