带有五线谱显示的图形化编曲机在嵌入式系统中的实现-电子与通信工程专业论文.docxVIP

第 第 II 页 A GRAPHIC MUSIC SEQUENCER WITH SCORE DISPLAY BASING ON EMBEDDED SYSTEM ABSTRACT The graphical music sequencer with score display is important to modern electric musical keyboard instruments. The author take the high-end electronic keyboards with graphical sequncer from overseas manufacturers as target, realized a graphical sequencer with score display basing on embeded system. The key of this paper is to convert the MIDI data into score display. MIDI file is the most common and important form of digital music storage, but its impossible to directly display the MIDI file in the form of musical notation, because the MIDI data can not tell the exact type of note and chords. So the quality of the convert model is crucial to the result of the convertion. An important criterion of judging the quanlity of the convertion is the arrangement of the timing of notes, and the score should be easy to read. The score is basically arranged according to the beat and measures, by studying the rules and usage of the score, a high quality MIDI to score convert model is designed. The score display content is tested and regulated by professional musicians evaluation. The results indicate that the quanlity of the MIDI to score convertor is better than the score convertor of some of the high-end electronic keyboards from overseas manufacturers, and the cost is significantly lower than those products. The system has successfully reached the expected goal. Keywords: embedded sequencer, electronic score, score display, convert midi file to score display 第 第 PAGE IV 页 目 录 摘 要I ABSTRACT II 第一章 绪论 1 1.1 课题背景和概述 1 1.2 本文研究的主要内容和安排 2 1.3 本人的工作内容 3 第二章 系统硬件方案设计 3 2.1 国外产品硬件平台分析 3 2.2 系统硬件需求分析 4 2.3 系统主要器件选型 6 2.3.1 液晶模块选型 6 2.3.2 CPU 选型 7 2.3.3 存储器选型 7 2.4 硬件系统框图 7 2.5 本章小结 8 第三章 用户界面和软件系统方案 8 3.1 用户界面设计 8 3.2 软件系统方案11 3.3 本章小结 15 第四章 将 MIDI 文件转换为五线谱显示的算法设计 16 4.1 五线谱和 MIDI 文件 16 4.1.1 五线谱的组成元素 16 4.1.2 MIDI 文件格式简介 19 4.2 为 MIDI 事件选择便于转换和编辑的数据结构 19 4.2.1 核心链表的数据结构 20 4.