利用MATLAB软件对音频信号进行频谱分析与处理.doc

详细了解了数字滤波器的滤波器设计,比较了 FIR 和IIR 滤波器的不同性能, 最终选择了设计 IIR 滤波器。通过设计低通、高通、带通和带阻等各种滤波器, 并分析了各滤波器的幅度特性和相频特性,熟悉了四种滤波器的性能。利用 MATLAB 软件分析音频信号的幅度响应和相位响应,学****了数字音频信号输入 MATLAB 环境并通过 MATLAB 播放的方法。通过比较音频信号输入前与输入后幅度响应和相位响应的差异,验证了以前所学****的转业知识。学****了 MATLAB 程序设计语言,编写了相应程序,产生了一个可以使操作更加方便的操作界面。画了软件实现和界面操作的流程图。关键词音频信号幅度响应相位响应 MATLAB 滤波器 IIR FIR 本科毕业设计说明书(论文) 第I页共I页毕业设计说明书(论文)外文摘要 Title To Analyze and Dispose The Spectra of The Audio Signal With MATLAB Abstract prehend the design ofdigital filter indetail, pare the performance ofthe FIR filter and IIR filter, and finally the IIR filter isbeen chosen todesign. The amplitude and phase characteristic ofthe filter isbeen analyzed, also the performance ofthe four filters isbeen known well, through the design oflow-pass high-pass, band-pass and Band-elimination filters. Using MATLAB toanalyze the amplitude response and phase response ofthe audio signal, tolearn how toinput the audio signal tothe MATLAB and how toplay the audio signal through MATLAB. The specialized subject knowledge isbeen certified paring the amplitude response and phase response ofthe two audio signals, and one ofthe two signals isbefore input, the other isafter input. Tolearn programming inMATLAB and the corresponding program isrealized, also anoperation interface isbrought tomake the processing more convenient .Also the flow chart about the realization ofthe software and the interface processing isbeen drown. Key words audio signal amplitude response phase respond MATLAB filter IIR FIR 本科毕业设计说明书(论文) 第 II页共I页目次 1引言··························································································································· 1 ············································································································· 1 本文主要研究内容································································································ 1 2MATLAB 简介·············································································································· 3