数字信号课程设计—钢琴琴键声音合成
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洛阳理工学院
课程设计报告
课程名称数字信号处理
设计题目钢琴琴键声音合成
专业通信工程
班级B100509
学号B********
姓名周东煜
完成日期2013年5月28日
课程设计任务书
设计题目:钢琴琴键声音合成
设计内容与要求:
钢琴声音优美号称“乐器之王”,据
研究发现钢琴的声音是若干基本频率的
倍频合成的。弹奏钢琴产生16个音符,
分别是“Do/Re/Mi/Fa/So/La/Si/Do(高)/
Do(高)/Si/La/So/Fa/Mi/Re/Do”,对此信
号进行STFT对此信号进行STFT,时频
谱如图所示
根据上述论述题目的基本要求如下:
(1)找到Do/Re/Mi/Fa/So/La/Si/Do(高)的基频;
(2)找出基频与倍频之间能量比率的关系;
(3)编写函数,用正弦波来合成钢琴的声音。
指导教师:王新新
2013年5 月27 日
课程设计评语
成绩:
指导教师:
2013年月日
摘要
目前,随着科技的不断发展,音频信号处理技术也发展异常迅猛,并且数字信号处理已成为主流。运用计算机来处理数字信号,这就使得数字信号的处理速度非常快,这也是数字信号处理技术发展迅猛的主要原因。将各种各样的音频信号转换为数字信号之后我们就可以快速而轻松的对这些音频信号进行处理了。在这方面,早已出现如语音识别软件的各种关于音频信号处理的软件,随着计算机技术的持续发展,计算机运算速度的大幅提高,音频处理软件的处理能力越来越强。以语音识别软件为例,现在的语音识别软件的识别准确度越来越高,识别速度越来越快,而今,我们运用的软件是matlab软件,这都主要归功于数字信号处理技术的发展。所以说,用数字信号处理音频信号的发展前景非常广阔。那么,我们就有理由选用数字信号处理的方法处理类似于钢琴音的音频信号。
钢琴声音优美,号称“乐器之王”,据研究发现钢琴的声音是若干基本频率的倍频合成的。弹奏钢琴产生16个音符,分别是“Do/Re/Mi/Fa/So/La/Si/Do(高)/ Do(高)/Si/La/So/Fa/Mi/Re/Do”
关键词:Matlab、电子琴、数字信号
abstract
At present, with the continuous development of science and technology, audio signal processing technology and development of abnormal rapidly, and digital signal processing has become the mainstream. Use computer to deal with digital signal, which makes very fast digital signal processing, digital signal processing technology which is developing rapidly. Convert all kinds of audio signal to digital signal after, we can quickly and easily for the audio signal processing. In this respect, have appeared such as voice recognition software on audio signal processing software, with the continued development of computer technology, the computer operation speed increase, audio processing software processing power is more and more strong. V oice recognition software, for example, is now the voice recognition software is more and more high recognition accuracy, and speed faster and faster, but now, we use the software matlab software, this is mainly due to the development of digital signal processing technology. So, with the development of digital signal processing audio signal prospects are very broad. So, we have reasons to use digital signal processing method of similar steel sound audio signal processing.
A beautiful piano sound, so-called \"the king of instruments\", according to research finds the sound of the piano is a number of basic frequency times frequency synthesis. Respectively, playing the piano have 16 notes, is \"Do Re Mi/Fa/So/La/Si/Do (high)/Do (high)/Si/La/So/Fa/Mi/Re/Do\"
Key word: Matlab, electric piano, digital signa