目 录1 绪论..........................................................................................................................................11.1 课题背景及意义...................................................................................................................11.2 课题的讨论内容...................................................................................................................22 系统方案论证..........................................................................................................................42.1 系统整体方案比较...............................................................................................................42.2 模块方案比较.......................................................................................................................52.2.1 DTMF 解码........................................................................................................................52.2.2 语音芯片............................................................................................................................62.2.3 主控制器选择....................................................................................................................63 系统总体设计和主要芯片选择..............................................................................................83.1 系统总体设计.......................................................................................................................83.2 主要芯片介绍.....................................................................................................................103.2.1 AT89S51..........................................................................................................................103.2.2 DTMF 芯片概述..............................................................................................................123.2.3 AT24C02..........................................................................
