目录
摘要 ........................................................................................................................2
1 语音录放系统总体设计及主要芯片说明..............................................................3
1.1 总体方案论证 ................................................................................................3
1.2 器件选择........................................................................................................3
1.2.1 单片机的选择 ..........................................................................................3
1.2.2 语音芯片选择 ..........................................................................................3
1.3 STC89C52 芯片说明 .......................................................................................4
1.3.1 STC89C52 的功能特性概述 ......................................................................4
1.4 ISD1420 语音芯片 ..........................................................................................4
1.4.1 ISD1420 的引脚功能 .................................................................................5
1.4.2 ISD1420 的操作模式 .................................................................................5
1.4.3 ISD1420 的应用电路 .................................................................................8
1.5 LM386 集成功率放大器芯片说明 ...................................................................8
1.5.1 LM386 电子特性 .......................................................................................8
1.5.2 LM386 的引脚说明 ...................................................................................9
2 硬件电路设计 .....................................................................................................10
2.1 系统硬件电路总体设计 ................................................................................10
2.2 STC89C51 的外围电路设计 ..........................................................................10
2.2.1 晶振电路设计.........................................................................................10
2.2.2 复位电路设计.........................................................................................11
2.3 语音电路设计 ..............................................................................................12
2.4 功放电路设计 ..............................................................................................13
3 语音录放系统软件设计 .....................................................................................15
3.1. 主要变量说明 ............................................................................................15
3.2. 主程序工作原理及流程图 ..........................................................................15
3.3. 子程序流程图及代码 .................................................................................17
3.3.1 录音子程序 ............................................................................................17
3.3.2 放音子程序 ............................................................................................18
3.4. 程序代码： ................................................................................................18
结束语 ...................................................................................................................21
附录 1....................................................................................................................22
