下载后可任意编辑目录引 言..............................................................................................................................................2一、设计要求.................................................................................................................................31.1 设计题目.......................................................................................................................................31.2 课题意义.......................................................................................................................................3二、系统硬件原理及设计...............................................................................................................32.1 系统组成框图...............................................................................................................................32.2 电子贺卡的功能结构框图...........................................................................................................4三、音乐基础知识..........................................................................................................................43.1 音乐基础.......................................................................................................................................43.2 音调脉冲和音乐节拍的实现.......................................................................................................53.2.1 音调脉冲的产生....................................................................................................................53.2.2 音乐节拍的产生....................................................................................................................63.2.3 音符码表的编制....................................................................................................................73.3 主程序流程图.............................................................................................................................
