数字信号发生器的设计

范文编号:WLX097  字数:5225,页数:24

摘     要

 本文提出了一种音频信号发生器的设计方法，音频信号发生器采用单片计算机控制扫频，数字模拟相结合，正弦波输出，失真小，稳定性好，频率范围覆盖整个音频频域，特别适合检听扬声器纯音。对数扫频和手动调频两种工作方式，扫频起点、终点及扫频时间可任意设定，手动调频有粗调和微调，可以精确调节频率。采用128×64点阵液晶块显示，同时显示频率和电压值。带有同步输出端。

关键词：  单片机 压控振荡器 液晶块显示 功率放大器

Abstract
 A procedure is about a way of how to design  a kind of Audio sweep Generator, the device is a novel audio sweep generator, controlled by MCU(Micro Controller Unit), combined with digital and analog circuits. The characteristics of this generator are as follows: Strong stability, sine wave output, tone of any loudspeaker. There are two kinds of working ways of logarithm sweep and manual frequency modulation. Besides, the start point , end point and sweep time can be set at random, and the frequency can be regulated accurately according to manual frequency modulation including rude frequency modulation and fine frequency modulation. The values of signal frequency and voltage are displayed synchronously on the LCD screen of 128*64 dot matrix. And there is a synchronous output.
Keywords：MCU;  VOC;  LCD;  AMP

目录
中文摘要..........................................................................1
英文摘要..........................................................................2
目录..............................................................................3
第1章     绪论...................................................................5
      1.1  研究的动机、目的及意义.................................................5
          1.1.1  研究的动机与目的.................................................5
          1.1.2  研究的意义.......................................................5
      1.2  范文内容概述...........................................................5
第2章     压控振荡器（VOC）的设计................................................6
      2.1  频率发生器方案的选择...................................................6
      2.2  VOC的设计..............................................................7
第3章     功率放大器（AMP）的设计................................................9
      3.1  功率放大器的设计.......................................................9
第4章     单片机控制板（MCU）的设计..............................................10
      4.1  电压比较器的设计（模数转换）...........................................10
      4.2  锁相环（PLL）的频率倍增................................................10
      4.3  十六进制计数器的设计..................................................11
      4.4  A/D和D/A的运用.......................................................12
          4.4.1  A/D的使用.......................................................12
          4.4.2  D/A的使用.......................................................13
      4.5  人机对话的设计........................................................13
      4.6.  电源的计.............................................................14
第5章     电路的硬件制作、调试、测试.............................................16
      5.1  硬件电路设计说明......................................................16
      5.2  调试说明..............................................................16
      5.3  测试说明..............................................................17
第6章     软件设计...............................................................18
      6.1  软件流程图............................................................18
第7章     结束语.................................................................21
致谢.............................................................................22
参考文献.........................................................................23
附录A   完整电路图...............................................................24

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