物理与电子工程学院课程设计技术报告数字信号处理课程设计回声信号的产生与消除姓名张针海学号10300123专业电子信息工程指导教师樊玲年级10级电信2班日期2013.5.25【摘要】本课程是利用Windows下的录音机，录制一段自己不小于10s的语音，然后在Matlab软件平台下，利用函数wavread对语音信号进行采样，并记录采样频率和采样点数。在抽样信号的基础上，通过采样后的的信号与原信号实现一次及多次延迟、叠加产生回波信号，再使用Matlab绘出有回声及无回声语音信号的时域波形和频谱图。再分别用频率抽样法设计的FIR滤波器和冲激相应不变法设计设计的IIR滤波器消除回声，并记录滤波器的频域响应，再绘制滤波后信号的时域波形和频谱，并对前后信号进行对比，分析信号的变化。[关键词]录音matlab采样滤波抽样[Abstract]thiscourseistouseataperecordertorecordvoiceunderWindows,asectionoftheirownnotlessthan10s,theninMatlabsoftwareplatform,samplingofthespeechsignalusingthefunction第1页物理与电子工程学院课程设计技术报告wavread,andrecordthesamplingfrequencyandsamplingpoints.Basedonthesamplingsignal,throughitsimplementationofsingleandmultiplesuperpositiondelay,echo,anduseMatlabtodrawtheechoandechofreespeechsignaltime-domainwaveformandspectrum.FIRfilterrespectivelybyfrequencysamplingdesignmethodandimpulsecorrespondinginvariantIIRfilterdesigntoeliminateecho,andrecordtheresponseofthefilterinfrequencydomain,andthendrawthetime-domainwaveformandspectrumofthefilteredsignal,andcomparedbeforeandafterthesignal,analysisofsignalchanges目录1设计目的及要求........................................................................................................................31.1设计回音目的及要求......................................................................................................31.2设计滤波器目的及要求...................................................................................................31.2.1FIR滤波器............................................................................................................................31.2.2巴特沃兹滤波器..................................................................................................................31.2.3距离估计要求......................................................................................................................42设计原理.............................................................................................................................43设计内容..............................................................................................................................43．1语音采集...................................................................................................................43.2信号分析.....................................................................................................................43．3制作回音........................................................................................................................53.4设计滤波器及滤波............................................................................................................83.4.1设计FIR滤波器及滤波.........................................................................................................83.4.1.1单回声的滤波.................................................................................................................83.4.2设计巴特沃兹滤波器及滤波.....................................................................................
