全国大学生电子设计大赛a样稿.doc

题目名称：红外通信装置（F题）
摘要：红外通信实质就是将音频信号经音频插孔输入电路，音频信号经三极管放大后推进红外发射管，接收端经音频放大集成电路LM386放大后经C1耦合至IC进行放大，因为IC含有功率放大能力，可供耳机收听。红外通信装置利用红外发光管和红外接收管作为收发装置，达成语音输入、传输及接收，我们以MP3为信号源，利用红外发射管、红外传输、红外接收管及以LM386为关键音频放大电路来实现目标。本系统是基于红外光通信原理，替换传统电流·电压传输，实现了基于红外光对语音传输及放大功效，LM386使用减小了系统失真度结果显示，我们确实实现了语音信号发射、传输、接收，不过输出信号出现了一定程度失真，噪音，经过对电阻调试、修改，使放大增益达成适宜范围，最终以较理想输出信号达成了设计要求。
关键字：红外通信；语音；放大
目 录
一、方案选择和论证·························································3
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二、理论分析和计算···························································4
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三、电路设计·································································6
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四．测试方案和测试结果·······················································9
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五．结论····································································9
参考文件····································································10
附录········································································10
附1：器件清单及具体参数·················································10
附2：仪器设备清单·······················································11
附3：电源电路·····················