ABSTRACT
With the acceleration of worldwide urbanization course, the rapid expansion of city scales and the continuous development of city construction, problems of urban environmental noise are becoming more and more serious. They have brought increasingly severe influence on people's working and living. And these problems have gradually become hot spots that arouse extensive attention like water pollution and air pollution. Although China has developed a number of laws relating to environmental noise control, which provide a legal basis for the management of environmental noise pollution, due to expensive market price of noise measuring instrument that the residents who living in the noisy environment can not be good to safeguard their interests.
This issue introduced the following Content. First, how to use a sound sensor to change the sound signal into voltage signal and an ADC0809 Chip to Analog-to-digital conversion. Second, using the single-chip microcomputer to deal with and display the data. This is a simple and cheap noise measuring instrument which is suitable for daily life and can be better used to help people improve the quality of life.
Keywords: noise，urban environmental noise，sound level meter
目录
摘要 I
ABSTRACT II
第1章 绪论 1
1.1 研究背景 1
1.1.1 城市噪声污染现状 1
1.1.2 国内外研究现状 2
1.2 课题的研究意义 2
1.3 课题的研究内容 4
第2章 噪声测量原理 5
2.1 概述 5
2.2 声电传感器的工作原理 5
2.3 声压级的测量机理 6
第3章 硬件电路的设计 7
3.1 系统的总体设计 7
3.2 单片机AT89S51 7
3.3 放大电路的设计 10
3.4 A/D转换电路设计 11
3.5 显示电路设计 12
第4章 系统的软件设计 14
4.1 软件总体设计思路 14
4.2 编程语言介绍 14
4.3 软件设计流程图 15
第5章 系统调试 16
5.1 Protel 99 SE 简介 16
5.2 keil简介 16
第6章 系统设计总结 18
6.1 设计总结 18
6.2 展望 18
致谢 19
参考文献 20
附录1 系统总体电路图 21
附录2 元器件清单 22
附录3 实物图 23
附录4 源程序 24
