數(shù)字語音教室中DirectShow的應(yīng)用

論文字?jǐn)?shù):11166,頁數(shù):24  有開題報(bào)告，任務(wù)書

摘 要
 隨著信息技術(shù)的高速發(fā)展，教育產(chǎn)業(yè)的信息化勢在必行，數(shù)字語音教室的高速發(fā)展和普及即將來臨，它也將為學(xué)生提供更豐富、優(yōu)秀的學(xué)習(xí)資源和條件，對學(xué)生在外語學(xué)習(xí)的聽、說、講三方面都有大有裨益，必將大大提高學(xué)校的教學(xué)質(zhì)量。
    本課題針對學(xué)校數(shù)字語音教室的需求，設(shè)計(jì)并實(shí)現(xiàn)了基于純軟件的一個簡化版本的數(shù)字語音教室。數(shù)字語音系統(tǒng)中比較關(guān)鍵的語音處理部分。語音處理需要經(jīng)過網(wǎng)絡(luò)兩端的共同協(xié)作來達(dá)到音頻互動的效果。本系統(tǒng)采用Directshow框架，基于Visual stuio 2005。NET開發(fā)平臺， 通過聲音的捕捉、壓縮、網(wǎng)絡(luò)傳送、解壓、回放流程來實(shí)現(xiàn)語音的實(shí)際需要。通過結(jié)合Directshow框架，針對用于網(wǎng)絡(luò)環(huán)境的多媒體程序，開發(fā)了發(fā)送和接收兩個FILTER，對學(xué)生分組實(shí)現(xiàn)靈活控制，優(yōu)化聲音音質(zhì)，對存儲壓縮，網(wǎng)絡(luò)帶寬優(yōu)化等問題進(jìn)行了有效的解決。
 基于Directshow框架的語音處理是一個十分成熟的技術(shù)框架，在此之上建立的數(shù)字語音系統(tǒng)無疑將具有廣泛的擴(kuò)展空間。
 
關(guān)鍵字： 數(shù)字語音, DIRECTSHOW , 組播
The Appliance Of Directshow In Digital Audio Room
                                                                
 
 Abstract
    With the rapid increasing of Information Techalog,Educational methods with a new fashion are exhibited for us,the emergence of Multimedia Room is especially typical.Digital Room is the important part of Multimedia Room.Most of the Multimedia Room is relative to analogue systems somehow.they have many inevitable shortages in compare to the Digitial Room.Therefor ,the development of Pure Digital Room has very import theortical and pratical vaule.
 The Pure Digital Room is design for Teaching requirment.it implement a simple voice
Chat system.The whole system is make up of five process: Capture,Pre-Process,Sending, Receiveing,Post-Process and play.with the Directshow Framework,what we need to do is just develop two filters for sending and receiving.
 The Pure Digital Room has been conducted in foreign lanuage education successfully. With extending ,it can be used in WLAN ,Just like Tele-Education.But it still need more and more improvement.
 
Keyword: Directshow , Mutlicast , Digital Audio
目錄
摘 要 I
Abstract II
1.緒論 1
1.1概念及其現(xiàn)狀 1
1.2數(shù)字語音教室的概念及其發(fā)展 1
1.3 數(shù)字語音教室的市場前景 2
1.4 語音教室的市場前景 2
1.5語音處理 2
2.技術(shù)基礎(chǔ) 3
2.1 COM 3
2.2 Directshow 3
2.3 Multicast 4
3. 語音處理模塊 6
3.1處理環(huán)節(jié) 6
3.2 Graph的構(gòu)成 7
3.3從始至終的聲音樣本 8
4. 聲音的捕捉和回放 10
4.1聲音的捕捉 10
 4.1.1 聲音捕獲過濾器 10
 4.1.2 聲音捕獲屬性 10
4.3聲音的回放 11
5壓縮和解壓 12
5.1壓縮格式的選擇 12
5.2聲音的壓縮 12
5.3 聲音的解壓 13
6網(wǎng)絡(luò)傳輸 14
6.1組播傳輸 14
6.2聲音的壓縮 14
 6.2.1  過濾器類型 14
 6.2.2  選擇父類 16
 6.2.3  實(shí)現(xiàn)Filter 16
6.3數(shù)據(jù)的發(fā)送 17
6.4數(shù)據(jù)的接收 18
結(jié)論 19
致謝 20
參考文獻(xiàn) 21