基于STC89C52单片机的次声信号发_生器的设计毕业论文.doc

毕业设计（论文） 设计（论文）题目： 基于STC89C52单片机的次声信号发生器的设计 重庆邮电大学本科毕业设计（论文） - PAGE 62 - 摘 要 随着人类对次声了解的深入，次声在科学、军事、医学等领域中的应用也越来越广。为了能够方便的研究次声，就必须要有能够方便产生次声的装置。这就有了本文的研究背景。 本系统以STC89C52单片机为核心，辅以必要的模拟电路，构成了一个基于STC89C52单片机的次声信号发生器。其主要模块有单片机控制模块、频率输出模块、键盘控制模块及LCD显示模块，其中频率生成模块由单片机控制DAC0832生成，键盘控制模块采用5个按键来选择波形类型及调节频率、幅值，显示模块则采用LCD1602来显示波形类型、频率及幅值，输出的波形由示波器进行检查。 实验结果表明，由STC89C52单片机所产生的次声波频率精度较高，且具有操作简单、成本低廉、使用方便等特点，值得在实验室中进一步推广和扩充。 【关键词】STC89C52单片机 DAC0832 LCD1602 键盘控制 次声检测 ABSTRACT With the depth understanding of infrasound by human being, infrasound in the scientific, military, medical and other applications in the field has become an increasingly widespread. In order to research the infrasound conveniently, we must have a device which can generate infrasound easily. This is the background of this article. This system take the STC89C52 monolithic integrated circuit as a core, auxiliary by necessity analogous circuit, constituted one based on the STC89C52 monolithic integrated circuit and the phase-locked loop infrasound signal generating device.Its main module has the frequency output module,the phase-locked loop frequency multiplication and the LCD demonstration. And the frequency production module controls DAC0832 by the monolithic integrated circuit.The keyboard control module take five key-press to choose the type of the wave and to adjust the frequency and the amplitude,the square-wave can adjust the dutyfactor willfully, demonstrates the the frequency on LCD. The results of experiment show that STC89C52CSM can generate the infrasound with high frequency accuracy, and has many features, such as simple, low-cost, easy to use. It is worth to further promote and expand in laboratory. 【Key words】 Stc89C52mcu Dac0832 Lcd1602 keyboard control Infrasound detection  目 录 TOC \o 1-3 \h \z \u 绪 论 h 错误！未定义书签。 第一章 次声发生器的概述 h 1 第一节 次声 h 1 一、 次声的概念 h 1 二、 次声的危害 h 1 三、 次声的应用 h 2 第二节 次声发生器 h 2 一、次声发生器概念 h 2 二、次声发生器的研究动态 h 3 第三节 本章小结 h 4 第二章 系统设计方案