目 录
第 1 章 引言................................................................................................................1
1.1 单片机介绍.................................................................................................1
1.2 单片机音乐.................................................................................................2
第 2 章 设计要求及理论基础 ....................................................................................3
2.1 设计要求.....................................................................................................3
2.1.1 基本要求...........................................................................................3
2.1.2 创新部分...........................................................................................3
2.1.3 成果形式...........................................................................................3
2.2 相关音乐知识.............................................................................................3
2.3 单片机产生音频脉冲原理 .........................................................................4
2.3.1 音符频率...........................................................................................4
2.3.2 定时/计数器 0 产生音符频率 ..........................................................5
2.4 单片机实现音乐的节拍 .............................................................................6
2.5 音频功放.....................................................................................................7
2.6 小结.............................................................................................................8
第 3 章 硬件设计 ........................................................................................................9
3.1 方案选取.....................................................................................................9
3.1.1 单片机的选取...................................................................................9
3.1.2 音频放大电路的选择 .....................................................................10
3.1.3 中断方式.........................................................................................12
3.1.4 LED 显示方式 ................................................................................12
3.1.5 LED 驱动电路 ................................................................................13
3.2 硬件电路的实现.......................................................................................13
3.2.1 AT89C2051 单片机硬件结构 ........................................................13
3.2.2 时钟与复位电路 .............................................................................17
3.2.3 选择按键输入电路 .........................................................................19
3.2.4 音频发生器.....................................................................................19
3.2.5 音频放大器.....................................................................................19
3.2.6 LED 点阵电路 ................................................................................23
3.2.7 LED 点阵驱动电路 ........................................................................24
