摘 要：本文将介绍一种以STC89C51型单片机为基础元件设计的音乐播放器。随着科技高速发展，生活节拍加速，人们长久处于工作、学习压力过大的状态，利用音乐调节心理压力非常重要，因此音乐播放器已经开始遍及海内外。学校里上下课的铃声，寝室内清晨的起床闹铃，都由之前古板难听的铃音转变成了优美的音乐，公路、广场中的计时装置也都开始采取音乐来充当铃声。此播放器不但给人类日常生活的计时提供了便利，而且也给当前快节拍的生活供给了快乐。

本文应用了MCS-51单片机原理和控制理论来设计音乐播放器的硬件电路，并利用C语言设计程序。为了产生不同频率的方波需要控制单片机内部的定时器，驱动蜂鸣器发出不同音调的音乐，再利用延迟来控制发音时间的长短。把乐谱转变成相应的定时常数就能从蜂鸣器中播放出优美的音乐。本文提出了基于单片机的音乐播放器的总体设计方案。92682

毕业论文关键词：单片机、音乐播放器、C语言

Abstract：This article introduces a kind of STC89C51-based microcontroller-based device designed for automatic music player。 In today's era of rapid development of this technology, the accelerated pace of life, the long-in work, learning burden the state's case for regulating psychological stress is important for everyone, this music player at home has begun universal。 Campus on the class of the ring, get up early morning dormitory No。 voices, strident tones by the previous dry transformed into good music, road, square in the timing devices are also beginning to use music as ring tones。 This device not only for the timing of daily life and provides a convenient, but also for the current fast-paced life fun。 

This is the application of MCS-51 SCM principles and control theory, music performance controller hardware and programming using c programming language。 By controlling the MCU's internal timer to generate square waves of different frequencies to drive speakers make different musical tones, and then use delay to control the length of pronunciation。 The music into the corresponding time constants can be played from the sound equipment out of melodious music。 The meter at present, and puts forward the overall design scheme of automatic music player。源F于K优B尔C论V文N网WwW.youeRw.com 原文+QQ752^018766

Keywords：Single-chip processor, Music player, C programming language

目录

1 绪论 5

2 系统基本设计方案 5

3 系统硬件设计 6

3。1 系统总体设计框图 6

3。2 单片机最小系统设计 6

3。3 选曲电路 10

3。4 音频发生及放大电路 11

4 系统软件设计 11

4。1单片机发声概述 11

4。2 程序流程图 13

4。3 音乐的产生 14

5 系统组装与调试 15

5。1 元器件组装 15

5。2 软件程序调试 17

5。3 硬件电路调试 17

5。4原理图 18

5。5仿真图 19

5。6实物图 20

结论 21