基于傅立叶变换的消噪软件的设计

JIMI

论文编号:WLX027  字数:5691,页数:17摘     要  本文介绍了利用Matlab软件对家庭录音音乐作简单的降噪处理。Matlab是具有很强的科学计算和图形显示界面的软件系统。该法可对音频信号进行基于FFT的短时频谱分析及显示，去除其中所含的白噪声，重构出消噪后的音乐信号，并通过应用实例证明了其有效性。文中介绍了白噪声，基于FFT频谱分析与消噪原理，Matlab的相关功能函数，并给出了一个程序实例及其实验结果。实验结果表明，该法所需的编程简单，对设备硬件要求不高，易于实现，能快速地在普通通用PC机上完成音频信号中白噪声的降噪处理。关键词：  傅立叶变换  matlab  频谱分析  wav  白噪声Abstract This paper describes the use of Matlab software on the home recording music for the simple Noise Reduction. Matlab is a strong scientific computing and graphics interface software systems. This method can be based on the audio signal of the FFT spectrum analysis and short-term, which included the removal of white noise, a noise elimination reconstruction after the music signal, and through the application of examples prove its effectiveness. The paper introduced the white noise, based on the FFT spectrum analysis and denoising principle, Matlab functions related to the function, and gives the example of a procedure and its results. Experimental results show that the law required the programming simple, the equipment hardware Yaoqiubugao, easy to realize, can quickly in the general Universal completed on PC audio signal in the white noise of Noise Reduction.Keywords：Fourier Transform ; matlab; Spectrum analysis; wav; White Noise目  录中文摘要 1英文摘要 2目录 3前言 4 第一章     音频信号基础 4  1.1   声音 1.2   噪声1.2.1  白噪声  White Noise1.2.2  粉红噪声  Pink Noise1.2.3  褐色噪声  Brown Noise      1.3   白噪声的数学描述第二章    FFT和频谱分析 6 2.1   快速傅立叶变换理论      2.2  音频信号的FFT频谱分析      2.3   Matlab信号处理工具箱功能介绍         第三章    消噪软件开发 8       3.1   设计目标       3.2   交互设计       3.3   图形用户界面       3.4   系统设计          3.4.1  模块一          3.4.2  模块二总结 14致谢 16参考文献 17