Matlab語音增強算法的仿真

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摘要
人們在語音通信的過程中，常常會受到各種環(huán)境噪聲的干擾，如餐廳的噪聲、汽車噪聲以及其他人的講話聲等。由于各種類型的噪聲，現(xiàn)今的語音通信系統(tǒng)嚴重惡化。噪聲不僅會影響語音的質(zhì)量，更會使人耳感覺疲勞。
語音增強算法是旨在盡可能的消除語音信號中的噪聲，提高語音信號的可懂度及減小失真度。經(jīng)過數(shù)十年的發(fā)展，大量的語音增強算法被提出，本文主要研究其中的LMS算法，并通過Matlab仿真實現(xiàn)該算法。LMS算法也就是最小均方算法，在上世紀60年代就被提出，由于其實現(xiàn)簡單并且對信道統(tǒng)計特性變化具有穩(wěn)健性，獲得了極為廣泛的應用。實驗結(jié)果表明，LMS算法具有良好的語音增強效果。
關(guān)鍵詞：語音增強，噪聲，質(zhì)量，可懂度，LMS算法

ABSTRACT
In the process of speech communication,people always be interfered by noise which exist in natural environment,such as noise in restaurant,car and other people's voices.Due to various type of noise,speech communication system of today become worse and worse.Noise not only affects the quality of the speech, but also will make people’ear feel tired.
Speech enhancement algorithm aim at eliminate the noise in noisy speech signal as much as possible, improve the intelligibility of noisy speech signal and reduce distortion.After several decades of development, a large number of speech enhancement algorithms have been proposed,this paper studies the LMS algorithm which is one of the speech enhancement algorithms,and simulate the algorithm by using Matlab.LMS algorithm,also known as Least mean square algorithm,was proposed in the 1960s,it is widely used in various fields,because of it can be simply realized and keep steady while statistical properties of channel changed.Experimental results show that, LMS algorithm has good effect in speech enhancement.
KEY WORDS: speech enhancement, noise,quality, intelligibility,LMS algorithm


目錄
第一章 緒論 1
1.1 課題的研究背景 1
1.2 語音增強的歷史和發(fā)展現(xiàn)狀 1
1.3 本文的主要研究內(nèi)容及結(jié)構(gòu)安排 2
第二章 語音增強的基礎知識 3
2.1 人耳的感知特性 3
2.2 噪聲的分類和及特性 3
2.2.1 噪聲的分類 3
2.2.2 噪聲的特性 3
2.3語音特性 4
第三章 基于LMS算法的語音增強技術(shù) 6
3.1 LMS算法原理 6
3.2 LMS算法的Matlab仿真結(jié)果 8
3.2.1 輸入信號為正弦信號的仿真結(jié)果 8
3.2.2 輸入信號是語音信號 10
總結(jié) 14
致謝 15
參考文獻 16
附錄 17