基于MATLAB的語(yǔ)音信號(hào)處理技術(shù)研究

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摘要： 語(yǔ)音信號(hào)處理是研究用數(shù)字信號(hào)處理技術(shù)對(duì)語(yǔ)音信號(hào)進(jìn)行處理的一門學(xué)科。它的目的有兩個(gè)：一個(gè)是要通過(guò)處理得到一些反映語(yǔ)音信號(hào)重要特征的語(yǔ)音參數(shù)；另一個(gè)是要通過(guò)處理某些運(yùn)算以達(dá)到某種用途的要求。在信息化發(fā)展如此迅速的今天，語(yǔ)音信號(hào)處理的一系列技術(shù)及其應(yīng)用已成為信息社會(huì)不可或缺的重要組成部分。
本文的主要研究對(duì)象是語(yǔ)音信號(hào)，在MATLAB環(huán)境下，首先根據(jù)語(yǔ)音信號(hào)的時(shí)域波形和頻譜圖，對(duì)其進(jìn)行分析，了解其時(shí)域特性及頻率分布；然后分別設(shè)計(jì)不同的IIR和FIR數(shù)字濾波器對(duì)加噪語(yǔ)音信號(hào)進(jìn)行濾波，并比較不同濾波器的濾波性能；最后，對(duì)語(yǔ)音信號(hào)進(jìn)行幅度和頻率調(diào)制，其中在幅度調(diào)制中涉及到解調(diào)，并通過(guò)低通濾波器還原語(yǔ)音信號(hào)。
在MATLAB環(huán)境下，得到對(duì)語(yǔ)音信號(hào)處理的各種結(jié)果。仿真結(jié)果表明，運(yùn)用本文所采用的語(yǔ)音信號(hào)處理的算法，可以很好地實(shí)現(xiàn)語(yǔ)音信號(hào)的時(shí)域、頻域分析，加噪信號(hào)的濾波以及信號(hào)的調(diào)制與解調(diào)。
關(guān)鍵詞：語(yǔ)音信號(hào)處理 MATLAB FFT 數(shù)字濾波 調(diào)制


Speech signal processing based on MATLAB
Abstract: Speech signal processing is a subject of studying on speech signal processing using digital signal processing technology.The purpose of it in two.One is to obtain some speech parameters that reflect the important features of speech signal for efficient transmission and storage of information in the speech signal.Another is to deal with some operations to achieve a certain application requirements.Nowadays the information technology develops so fast that a series of technology of speech signal processing and its applications have become an important part of information society.
The main object of this paper is the speech signal, under MATLAB condition, first of all, analyze and understand its characteristics in time and frequency distribution according to the speech signal time-domain waveform and frequency spectrum.Then design different IIR and FIR digital filters to filter the noisy speech signal, and take the performance of different filters into comparison.Finally, there are amplitude and frequency modulation of the speech signal, which involves demodulation in the amplitude modulation.We can obtain the reduction of speech signal through the low-pass filter.
Under MATLAB condition,we can get a variety of results of speech signal processing. The simulation results show that we can realize the time domain, frequency domain analysis of speech signal,signal plus noise filtering and signal modulation and demodulation by using the speech signal processing algorithm.
Keywords: speech signal processing MATLAB FFT digital filter modulation

目 錄
第1章 緒 論 1
1.1選題背景及意義 1
1.2國(guó)內(nèi)外研究動(dòng)態(tài) 2
1.2.1國(guó)外語(yǔ)音處理技術(shù)的發(fā)展 2
1.2.2國(guó)內(nèi)語(yǔ)音處理技術(shù)的發(fā)展 3
1.2.3語(yǔ)音信號(hào)處理的應(yīng)用 4
1.3課題的主要工作 6
第2章 語(yǔ)音信號(hào)處理基礎(chǔ) 7
2.1語(yǔ)音信號(hào)概述 7
2.1.1語(yǔ)音和語(yǔ)言 7
2.1.2語(yǔ)音的產(chǎn)生 8
2.2語(yǔ)音信號(hào)的分析 9
2.2.1語(yǔ)音信號(hào)的時(shí)域分析 10
2.2.2語(yǔ)音信號(hào)的頻域分析 11
2.3本章小結(jié) 12
第3章 FFT變換與數(shù)字濾波器設(shè)計(jì) 13
3.1 FFT變換 13
3.1.1 DFT運(yùn)算及特點(diǎn) 13
3.1.2 FFT算法及特點(diǎn) 13
3.2 數(shù)字濾波器的設(shè)計(jì) 14
3.2.1 IIR數(shù)字濾波器的設(shè)計(jì) 15
3.2.2 FIR數(shù)字濾波器的設(shè)計(jì) 16
3.3 本章小結(jié) 17
第4章 基于MATLAB的語(yǔ)音信號(hào)分析與處理 19
4.1 MATLAB簡(jiǎn)介 19
4.2語(yǔ)音信號(hào)的采集 19
4.2.1語(yǔ)音信號(hào)的錄入 19
4.2.2語(yǔ)音信號(hào)的讀入 20
4.3時(shí)域信號(hào)的FFT變換 20
4.4加噪信號(hào)的濾波處理 22
4.4.1含噪語(yǔ)音的合成 22
4.4.2加噪信號(hào)的濾波 24
4.5語(yǔ)音信號(hào)的調(diào)制 33
4.5.1信號(hào)的幅度調(diào)制 33
4.5.2信號(hào)的頻率調(diào)制 36
4.6本章小結(jié) 37
第5章 結(jié)論與展望 38
5.1總結(jié) 38
5.2展望 38
致 謝 40
參考文獻(xiàn) 41