基于LabView的语音信号分析系统

学号：14112203211毕业设计(论文)题目:基于LabVIEW的语音信号分析系统的设计作者贾邦稳届别2015届院别信息与通信工程学院专业电子信息工程指导教师彭仕玉职称副教授完成时间2015年5月湖南理工学院毕业设计(论文)I摘要虚拟仪器与传统仪器相比，实现了仪器的智能化、模块化、多样化等功能，体现出多功能、低成本等操作优点，应用前景广阔。随着计算机的出现及计算机技术的快速发展，语音信号处理技术更是得到了飞速发展，得到了广泛的应用，如语音合成技术、语音压缩编码和语音识别技术。本设计利用虚拟仪器软件平台LabVIEW设计了一个语音信号分析系统。先介绍了四种采集语音信号的方法，并选择采用录音机录制的方法采集语音信号，然后设计基于LabVIEW的时域信号的FFT分析模块，接着设计截止频率为3000Hz的Butterworth低通滤波器对语音信号进行滤波去噪，最后根据以上设计进行语音信号的时频分析、特性分析等。关键词：虚拟仪器；LabVIEW；语音信号；时频分析；数字滤波器湖南理工学院毕业设计(论文)IIAbstractComparedwithtraditionalinstruments,virtualinstrumentsachievetheintelligent,modularity,diversityandotherfunctionsoftheinstrument,andreflecttheoperatingadvantages,suchasmulti-purpose,lowcost,etc.Soithasbroadapplicationprospect.Withtheadventofcomputersandtherapiddevelopmentofcomputertechnology,speechsignalprocessingtechnologyhasbeendeveloprapidly,andusedwidely,suchasspeechsynthesistechnology,speechcodingandspeechrecognitiontechnology.ThisdesignprojectsaspeechsignalanalysissystembasedonthevirtualinstrumentsoftwareplatformLabVIEW.Thefirststepistointroducethemethodsoffourkindsofvoicesignalacquisition,andselectthemethodofrecordingvoicesignalbyrecorder.ThesecondstepistodesignFFTanalysisoftime-domainsignalswhichbasedonLabVIEW.ThendesignButterworthlowpassfiltertorealizethefiltrationofspeechsignalswhichcutofffrequencyis3000hz.Finallyitistoachievetime-frequencyanalysisandcharacteristicanalysisaccordingtothetheabovedesigns.Keywords：Virtualinstruments；LabVIEW；Speechsignal；time-frequencyanalysis；digitalfilter.湖南理工学院毕业设计(论文)III目录摘要.........................................................................................................................................IAbstract....................................................................................................................................II目录......................................................................................................................................III第1章绪论............................................................................................................................11.1虚拟仪器概述..................................................................................................................................11.2语音信号处理的发展及应用..........................................................................................................21.3本课题研究任务及章节安排..........................................................................................................4第2章系统设计方案..............................................................................................................52.1系统基本概述...................................................................................................................................52.2系统总体实现...................................................................................................................................52.3系统框图...........................................................................................................................................7第3章语音信号的采集..........................................................................................................83.1语音信号的采集方法......................................................................................................................83.2声卡的相关介绍及参数设置........................................................................................................103.2.1LabVIEW中的相关声卡函数............................................................................................103.2.2声卡的参数及设置..............................................................................................................113.3读取历史语音信号的设计............................................................................................................14第4章基于LabVIEW的语音信号分析的实现.................................................................154.1语音信号的时域分析.....................................................................................................................154.1.1语音信号的预处理..............................................................................................................154.1.2语音信号的短时能量和短时平均幅度函数......................................................................174.1.3语音信号的短时自相关函数和短时平均幅度差函数......................................................184.2语音信号的频域分析.....................................................................................................................184.3滤波器的设计及滤波实现.............................................................................................................204.4语音信号的综合实现.....................................................................................................................234.4.1语音分析系统的整体设计..................................................................................................234.4.2语音信号的时频分析..........................................................................................................24第5章总结............................................................................................................................25参考文献.......