電子通信論文編號:TX036       論文字?jǐn)?shù):25507,頁數(shù):56

目錄
摘要   I
ABSTRACT   II
第一章 緒論   1
1.1語音信號預(yù)測編碼的數(shù)據(jù)壓縮研究的目的及意義   1
1.2語音信號壓縮編碼技術(shù)及類別   2
1.3語音信號壓縮編碼技術(shù)的發(fā)展概況   4
1.4語音信號預(yù)測編碼的數(shù)據(jù)壓縮的研究內(nèi)容   5
第二章 語音預(yù)測編碼的壓縮依據(jù)及標(biāo)準(zhǔn)   7
2.1語音信號壓縮的基本依據(jù)   7
2.2語音信號壓縮編碼的性能指標(biāo)及質(zhì)量評估  8
2.2.1 性能指標(biāo)   8
2.2.2 質(zhì)量評估   10
2.3 G.7xx：音頻壓縮協(xié)議  12
第三章 語音信號預(yù)測編碼的算法基礎(chǔ)   14
3.1預(yù)測編碼(Prediction Coding)   14
3.2差分脈沖編碼調(diào)制(DPCM)   14
3.3自適應(yīng)差分脈沖編碼調(diào)制(ADPCM)   16
3.3.1 ADPCM編碼   18
3.3.2 ADPCM解碼   19
第四章 語音預(yù)測編碼的壓縮系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)   20
4.1總體設(shè)計(jì)   20
4.1.1 整體思想   20
4.1.2 程序功能模塊   21
4.2模塊的設(shè)計(jì)與實(shí)現(xiàn)   25
4.2.1 壓縮模塊     25
4.2.2 錄音模塊   27
4.3設(shè)計(jì)介紹   29
4.3.1 設(shè)計(jì)環(huán)境及wav文件格式的概述   29
4.3.2 界面功能介紹   30
4.4對本設(shè)計(jì)所選用的算法和及其衍生算法進(jìn)行分析、比較  33
第五章 總結(jié)與展望   36
5.1設(shè)計(jì)總結(jié)   36
5.2工作展望   37
參考文獻(xiàn)   38
致謝   39
附錄   40

摘要
隨著通信、計(jì)算機(jī)網(wǎng)絡(luò)等技術(shù)的飛速發(fā)展，數(shù)據(jù)壓縮技術(shù)已成為當(dāng)今數(shù)字通信、廣播、存儲和多媒體娛樂中的一項(xiàng)關(guān)鍵的共性技術(shù)。大量的數(shù)字化多媒體信息，對這些信息量進(jìn)行有效的壓縮，然后投入到實(shí)際的應(yīng)用中顯得極為重要。
音頻壓縮指的是對原始數(shù)字音頻信號流（PCM編碼）運(yùn)用適當(dāng)?shù)臄?shù)字信號處理技術(shù)，不損失有用信息量，降低其碼率，也稱為壓縮編碼。在預(yù)測技術(shù)產(chǎn)生之后，語音壓縮的靈活運(yùn)用，多種嶄新的技術(shù)的出現(xiàn)，使語音編碼成為了一個令人振奮、活躍的研究領(lǐng)域。
系統(tǒng)分為錄制語音及壓縮兩個模塊，使用Visual C++ 6.0編寫。本文介紹了語音信號預(yù)測編碼的數(shù)據(jù)壓縮算法研究的許多方面，主要集中在語音編碼的一些主要觀念和設(shè)計(jì)的思想和實(shí)現(xiàn)方法，提供了語音編碼方面研究的概論，各種語音編碼技術(shù)以及G.7xx標(biāo)準(zhǔn)，還詳細(xì)地?cái)⑹隽擞嘘P(guān)預(yù)測編碼以及ADPCM的相關(guān)知識，設(shè)計(jì)了一個在達(dá)到一定壓縮比的前提下，具有較高語音質(zhì)量的，用以實(shí)現(xiàn)進(jìn)行語音壓縮的軟件。

關(guān)鍵詞：語音信號，數(shù)據(jù)壓縮，預(yù)測編碼，ADPCM

ABSTRACT
With the fact that technologies such as communication , computer network develops at full speed, the data compression technology already becomes one key industry-specific technology in digital communication, broadcast , memory and multi-media entertainment in the nowadays. There is a lot of digital multimedia information. It becomes more important that doing effective compression before putting it into practical application.
Audio compression means to primitive figure an audio signal stream (PCM code) uses appropriate techniques of digital signal processing, before do not lose useful information amounts, and reduce the coding (compressing) rates. Audio compression also called the compression code. The flexible application of speech coding behind predicting technology creation, various brand-new technology appearing, which have made speech coding become an inspiring enthusiasm, active research field.
The data compression system is divided into two modules，voice record and compression, which is using Visual C + + 6.0 to program. This paper, in the respect of a lot of being going to introduce that speech signal predictive code data compression algorithm, is focusing on some main concept of speech coding and the designing thought and realization method. It have provided the introduction of various speech coding technology and the G.7xx standards, also have narrated relevance knowledge about predictive coding and ADPCM detailed, and have designed a software for the realization of speech compression in a certain compression ratio on the premise that high voice quality of speech.

KEY WORDS  speech coding, data compression, predictive coding, ADPCM