【正文】
宿州學(xué)院畢業(yè)論文設(shè)計基于matlab聲音信號的濾波去噪處理 摘要濾波器設(shè)計在數(shù)字信號處理中占有極其重要的地位。FIR數(shù)字濾波器和IIR濾波器是濾波器設(shè)計的重要組成部分。Matlab功能強大、簡單易學(xué)、編程效率高,深受廣大科技工作者的歡迎。特別是Matlab還具有信號分析工具箱,不需具備很強的編程能力,就可以很方便地進行信號分析、處理和設(shè)計。利用MATLAB信號處理工具箱可以快速有效地設(shè)計各種數(shù)字濾波器。課題基于MATLAB有噪音語音信號處理的設(shè)計與實現(xiàn),綜合運用數(shù)字信號處理的理論知識對加噪聲語音信號進行時域、頻域分析和濾波。通過理論推導(dǎo)得出相應(yīng)結(jié)論,再利用MATLAB作為編程工具進行計算機實現(xiàn)。在設(shè)計實現(xiàn)的過程中,使用窗函數(shù)法來設(shè)計FIR數(shù)字濾波器,用巴特沃斯、切比雪夫和雙線性變法設(shè)計IIR數(shù)字濾波器,并利用MATLAB作為輔助工具完成設(shè)計中的計算與圖形的繪制。通過對對所設(shè)計濾波器的仿真和頻率特性分析,可知利用MATLAB信號處理工具箱可以有效快捷地設(shè)計FIR和IIR數(shù)字濾波器,過程簡單方便,結(jié)果的各項性能指標均達到指定要求。 ABSTRACTThe Design of Analysis and Processing Voice Signal Abstract Speech signal processing is to study the use of digital signal processing technology and knowledge of the voice signal voice processing of the emerging discipline is the fastest growing areas of information science one of the core technology. Transmission of information through the voice of humanity39。s most important, most effective, most popular and most convenient form of exchange of information.. Matlab language is a data analysis and processing functions are very powerful puter application software, sound files which can be transformed into discrete data files, then use its powerful ability to process the data matrix operations, such as digital filtering, Fourier transform, when domain and frequency domain analysis, sound playback and a variety of map rendering, and so on. Its signal processing and analysis toolkit for voice signal analysis provides a very rich feature function, use of these functions can be quick and convenient features plete voice signal processing and analysis and visualization of signals, makes puter interaction more convenient . Matlab Signal Processing is one of the important areas of application. The design of voiceprocessing software for most of the content are numerous, easy to maneuver and so on, using prehensive use GUI interface design, various function calls to voice signals such as frequency, amplitude, Fourier transform and filtering, the program interface concise, simple, has some significance in practice. Finally, the speech signal processing further development put forward their own views. 2 目 錄摘要1ABSTRACT11. 緒論 2. 語音信號去噪方法的研究 3. 去噪和仿真的研究 原始語音信號頻譜分析及仿真13 加噪語音信號頻譜分析及仿真15 去噪及仿真18 結(jié)合去噪后的頻譜圖對比兩種方式濾波的優(yōu)缺點22總結(jié)24致謝25參考文獻26 語音信號的采集與分析技術(shù)是一門涉及面很廣的交叉科學(xué),它的應(yīng)用和發(fā)展與語音學(xué)、聲音測量學(xué)、電子測量技術(shù)以及數(shù)字信號處理等學(xué)科緊密聯(lián)系,語音是人類獲取信息的重要來源和利用信息的重要手段。在信號傳輸過程中,由于實驗條件或各種其他主觀或客觀條件的原因,語音處理系統(tǒng)都不可避免地要受到各種噪聲的干擾。噪聲不但降低了語音質(zhì)量和語音的可懂度,而且還將導(dǎo)致系統(tǒng)性能的急劇惡化,嚴重時使整個系統(tǒng)無法正常工作。 MATLAB是由美國mathworks公司發(fā)布的主要面對科學(xué)計算、可視化以及交互式程序設(shè)計的高科技計算環(huán)境。它將數(shù)值分析、矩陣計算、科學(xué)數(shù)據(jù)可視化以及非線性動態(tài)系統(tǒng)的建模和仿真等諸多強大功能集成在一個易于使用的視窗環(huán)境中,為科學(xué)研究、工程設(shè)計以及必須進行有效數(shù)值計算的眾多科學(xué)領(lǐng)域提供了一種全面的解決方案,并在很大程度上擺脫了傳統(tǒng)非交互式程序設(shè)計語言,如C、Fortran的編輯模式,代表了