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基于matlab語音信號(hào)處理設(shè)計(jì)-展示頁

2024-11-24 15:26本頁面
  

【正文】 是它的快速發(fā)展可以說是從 1940 年前后 Dudley 的聲碼器和 Potter 等人的可見語音開始的 。在此基礎(chǔ)上,語音信號(hào)處理的研究工作得到了計(jì)算機(jī)技術(shù)的幫助,取得了突破性的進(jìn)展。 20 世紀(jì) 50 年代隊(duì)語言產(chǎn)生了系統(tǒng)的論述。它可以把語音的時(shí)變頻譜用語圖表示出來,從而得出了“可見語言”。 19世紀(jì) 60 年代,亥姆霍茲應(yīng)用聲學(xué)方法對(duì)元音和歌唱進(jìn)行了研究,從而奠定了語言的聲學(xué)基礎(chǔ)。 1939 年提出并研制成功的第一個(gè)聲碼器,從此奠定了語音產(chǎn)生模型的基礎(chǔ)。因此,這種語言研究常被稱為“口耳之學(xué)”,所以對(duì)語音只是停留在定性的描寫上 。 國內(nèi)外研究狀況 早在一兩千年前,人們便對(duì)語言進(jìn)行了研究。對(duì)語音信號(hào)采集與分析的研究一直是數(shù)字信號(hào)處理技術(shù)發(fā)展的重要推動(dòng)力量。 語音信號(hào)采集與分析之所以能夠那樣長(zhǎng)期地、深深地吸引廣大科學(xué)工作者去不斷地對(duì)其進(jìn)行研究和探討,除了它的實(shí)用性之外,另一個(gè)重要原因是,它始終與當(dāng)時(shí)信息科學(xué)中最活躍的前沿學(xué)科保持密切的聯(lián)系.并且一起發(fā)展??梢?,語音信號(hào)采集與分析的研究將是一項(xiàng)極具市場(chǎng)價(jià)值和挑戰(zhàn)性的工作。作為高科鼓應(yīng)用領(lǐng)域的研究熱點(diǎn),語音信號(hào)采集與分析從理論的研究到產(chǎn)品的開發(fā)已經(jīng)走過了幾十個(gè)春秋并且取得了長(zhǎng)足的進(jìn)步。讓計(jì)算機(jī)能聽懂人類的語言,是人類自計(jì)算機(jī)誕生以來夢(mèng)寐以求的想法。并且,由于語言和語音與人的智力活動(dòng)密切相關(guān),與社會(huì)文化和進(jìn)步緊密相連,所以它具有最大的信息容量和最高的智能水平。語言是人類持有的功能, 聲音是人類常用的工具,是相互傳遞信息的最主要的手段。 FFT。 speech signal。 關(guān)鍵字: Matlab;語音信號(hào) ; 信號(hào)處理;傅里葉變換;濾波器 The Design of Analysis 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。最后對(duì)比濾波前后的語音信號(hào)的時(shí)域和頻域特性,回放含 噪語音信號(hào)和去噪語音信號(hào),對(duì)比研究了IIR 濾波器和 FIR濾波 器在信號(hào)處理尤其是信號(hào)濾波去噪方面的特性和應(yīng)用。 本設(shè)計(jì)通過下載 一段語音,對(duì)其進(jìn)行了時(shí)域分析,頻譜分析 ,分析語音信號(hào)的特性。 Matlab語言是一種數(shù)據(jù)分析和處理功能十分強(qiáng)大的計(jì)算機(jī)應(yīng)用軟件,它可以將聲音文件變換為離散的數(shù)據(jù)文件,然后利用其強(qiáng)大的矩陣運(yùn)算能力處理數(shù)據(jù),如數(shù)字濾波、傅里葉變換、時(shí)域和頻域分析、聲音回放以及各種圖的呈現(xiàn)等,它的信號(hào)處理與分析工具箱為語音信號(hào)分析提供了十分豐富的功能函數(shù),利用 這些功能函數(shù)可以快捷而又方便地完成語音信號(hào)的處理和分析以及信號(hào)的可視化,使人機(jī)交互更加便捷。Matlab 語音信號(hào)處理 摘要 語音信號(hào)處理是研究用數(shù)字信號(hào)處理技術(shù)和語音學(xué)知識(shí)對(duì)語音信號(hào)進(jìn)行處理的新興的學(xué)科,是目前發(fā)展最為迅速的信息科學(xué)研究領(lǐng)域的核心技術(shù)之一。通過語音傳遞信息是人類最重要、最有效、最常用和最方便的交換信息形式。信號(hào)處理是 Matlab重要應(yīng)用的領(lǐng)域之一。并應(yīng)用 matlab平臺(tái)對(duì)語音信號(hào) 除去噪聲,進(jìn)一步設(shè)計(jì) 三 種濾波器即高通濾波器、低通濾波器 、 帶通濾波器 , 基于洪澤 三 種濾波器設(shè)計(jì)原理,用窗函數(shù)法設(shè)計(jì)出這 三 種濾波器,然后含加噪的語音信號(hào) 進(jìn)行濾波處理。論文從理論和實(shí)踐上比較不同數(shù)字濾波器的濾波效果。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 mobile phone collection a noisy speech, has carried on the analysis in time domain, frequency spectrum analysis, analysis of the characteristics of speech signal. And application of the MATLAB platform to the voice signal to remove noise, the further design of three kinds of filter is a highpass filter, lowpass filter, bandpass filter, based on the Hongze three kinds of filter design, window function method to design the three kinds of filter, and then with the original speech signal filtering. Finally the parison before and after filtering the speech signal in time domain and frequency domain, the playback noise speech signal denoising and the voice signal, a parative study of the IIR filter and a FIR filter in signal processing especially for signal denoising in terms of the characteristics and application of. The theory and practice from the parison of different digital filtering effect. Keywords: Matlab。 signal processing。 filter 目錄 摘要 ................................................................................. I Abstract ............................................................................ II 第一章緒論 ........................................................................... 1 ................................................................ 1 ................................................................ 1 ...................................................... 2 .......................................................... 2 .......................................................... 2 第二章語音信號(hào)處理的總體方案 .......................................................... 4 ...................................................... 4 .............................................................. 4 .......................................................... 4 .................................................... 4 Wavread函 數(shù)介紹 ........................................................ 4 ........................................................ 5 第三章語音信號(hào)處理的基本知識(shí) .......................................................... 6 .............................................................. 6 ............................................................ 6 時(shí)域信號(hào) FFT 分析 ............................................................ 6 第四章 語音信號(hào)的采集 ................................................................ 7 ................................................................ 7 ............................................................ 8 第五章 數(shù)字濾波器的設(shè)計(jì)和畫出其頻率響應(yīng) .............................................. 10 ......................................................... 10 FIR濾波器的性能比較 .............................................. 10 FIR濾波器 ............................................................... 11 ...................................................... 11 ...................................................... 12 的設(shè)計(jì) .................................................... 13 IIR濾波器 ............................................................... 14 .................................................... 14 ...................................................... 15 ...................................................... 17 第六章 語音信號(hào)的濾波 ............................................................... 19 ........................................................... 19 ...........................................
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