目录
1 绪论.........................................................................................................................................1
1.1 题目背景及目的 ..............................................................................................................1
1.2 国内外研究状况 ..............................................................................................................1
1.3 题目研究方法 ..................................................................................................................2
1.4 论文构成及研究内容 .......................................................................................................2
2 电子音乐门铃系统简介.........................................................................................................3
2.1 分析功能要求 ...................................................................................................................3
2.2 系统原理与控制方法 ......................................................................................................4
2.3 单片机发音概述 ..............................................................................................................4
2.3.1 音调........................................................................................................................4
2.3.2 节拍........................................................................................................................5
3 系统硬件设计.........................................................................................................................7
3.1 原理简介 ..........................................................................................................................7
3.2 主电路设计 ......................................................................................................................8
3.3 音乐功放电路设计 ........................................................................................................11
3.3.1 概述......................................................................................................................11
3.3.2 特性......................................................................................................................12
3.3.3 应用电路...............................................................................................................12
3.3.4 芯片使用方法与自激啸叫防治措施..................................................................14
4 系统软件设计.......................................................................................................................16
4.1 软件介绍 ........................................................................................................................16
4.2 主程序设计 ....................................................................................................................18
4.3 播放文件程序设计 ........................................................................................................20
5 系统调试与实现...................................................................................................................22
5.1 硬件调试与实现 ............................................................................................................22
