数控音频播放器【北邮大二下小学期】.pdf

北京邮电大学 信息与通信工程学院 2013 小学期实验 题目: 数控音频播放器的硬件实现 成员 学号 班级 班内序号 刘琳君 2011210350 2011211112 22 陈秀玲 2011210351 2011211112 23 王君妍 2011210352 2011211112 24 指导老师：杨钢 2013 年7 月 摘 要：数控音频播放器是一款进行音频放大和输出的电路模块。在功能上既要保证电路的输出增益稳定， 失真程度小，同时要能够完成自动时钟计数和音量控制。本实验中共设计了电源模块、振荡电路模块、逻 辑门控制模块、音频放大模块和功率放大模块这五个基本模块来达到各个部分的要求，另外设计了一个拓 展模块巴特沃斯二阶滤波器来提高输出音频的质量。本实验报告详细介绍了各个基本模块设计思路，罗列 了设计原理，实验电路图，调试过程，修改方案，测量数据和实验结果，并且做了深刻的实验总结。同时 阐述了拓展部分的思路和实现电路，对最终未能实现的拓展模块则在实验创新部分进行了介绍。本次实验 既完成了实验的基本要求，又体现了多角度性和创新性。 关键词：数控音频播放；音量调节；增益；滤波器；功率放大 Abstract ：NC audio player is a circuit module for audio amplification and output. It ensures the stability of the output gain with small distortion. Meanwhile, it realizes the automatic clock counting function and volume control function. The experiment designs five fundamental circuit modules, including Voltage Converter, Oscillatory Circuit, Logic Gate Circuit, Audio Amplifier and Bridge Power Amplifier, to meet the requirements. In addition, another expansion module, a second-order Butterworth filter, is designed to improve the output audio’s quality. This lab report introduces the design thought of all the basic modules, listing things including the design schematic diagram, experimental circuit diagram, debugging process, modification proposal, measurement data and experimental results in detail, and makes a profound summary. It also explains the thought of the expansion part and its realization circuit, introducing the final expansion module failed to be achieved in the innovation section. This experiment not only meets the basic requirements of the lab, but also shows the multi-angle quality and innovation. Keywords: NC audio playback; volume adjustment; gain; filter; power amplifier