【正文】 Q260046902 專業(yè)做論文西南科技大學畢業(yè)設計（論文）題目名稱：基于 AC3 的虛擬環(huán)繞聲實現(xiàn)年 級：2022 級 √本科 □?？茖W生學號：20225303學生姓名：黃小寶 指導教師：詹曦學生單位：信息工程學院 技術職稱：助教學生專業(yè)：通信工程 教師單位：信息工程學院西 南 科 技 大 學 教 務 處 制西南科技大學本科生畢業(yè)論文 I基于 AC3 的虛擬環(huán)繞聲實現(xiàn)摘要：Dolby AC3 提供的 聲道音頻模式是當前應用得最廣泛、聲音質量較高、編碼效率最高的一種音頻編碼模式?；?AC3 的虛擬環(huán)繞聲系統(tǒng)能夠滿足人們在不允許布置多個揚聲器的情況對環(huán)繞聲音質的要求，而且簡化了系統(tǒng)，降低了消費；它特別適用于耳機這類只有兩個揚聲器的設備。本文論述了用軟件實現(xiàn)虛擬環(huán)繞聲的兩種途徑，即用 Matlab 和 C 語言編程來仿真 聲道虛擬環(huán)繞聲重放。用 Matlab進行虛擬環(huán)繞聲的仿真是通過對 AC3 音頻文件解碼后得到的六個聲道信號進行虛擬環(huán)繞聲濾波處理。C 程序設計將多通道虛擬環(huán)繞聲處理技術與 AC3 解碼程序相結合，實現(xiàn)基于 AC3 的 聲道虛擬環(huán)繞聲重放系統(tǒng)。Matlab 和 C 語言的實現(xiàn)結果通過標準布置的左、右兩個揚聲器播放，在正確的聽音位置進行試聽，能夠感覺到聲音有明顯的空間感和立體感，實現(xiàn)結果良好。關鍵詞：虛擬環(huán)繞聲；Dolby AC3；HRTF；AC3 解碼器西南科技大學本科生畢業(yè)論文 IIVirtual Reproduction of Surround Sound Based on AC3Abstract : The model of channel audio supplied by Dolby AC3 is widely used. The quality of channel audio is good, and the coding efficiency of the coding model is the highest at present. The System of the Virtual Reproduction of Surround Sound based on AC3 will be able to meet people’s requirement of the higher quality of surround sound, while it is not allowed to place more speakers due to the limited conditions, and it could simplify the system and reduce the consumption. It is especially fit to the equipments that have only two speakers, such as headphones. This paper discussed the two methods of making virtual surround sound e true, ., use Matlab and C language to simulate the virtual reproduction of AC3 channel surround sound. Because of processing the six channels signal of AC3 by using the virtual surround sound filtering technology, the simulation of the virtual reproduction of surround sound under Matlab es true. While programming by C language, The System of the Virtual Reproduction of Surround Sound based on AC3 es true by bining the virtual surround sound filtering technology and AC3 decoder. While the results of Matlab program and C language program be played by two speakers that placed at the standard position, you could feel the feeling of spaciousness and third dimension obviously. So, the result of the implementation is well.Keywords: Virtual Surround Sound, Dolby AC3, HRTF, AC3 decoder西南科技大學本科生畢業(yè)論文 III目 錄第 1 章 緒 論 ..........................................................................................................1 課題背景、目的及意義 .............................................................................1 課題背景...............................................................................................1 課題的目的及意義...............................................................................4 論文的主要內(nèi)容和框架 .............................................................................4第 2 章 系統(tǒng)總體設計 ..............................................................................................6 系統(tǒng)實現(xiàn)原理 .............................................................................................6 MATLAB 仿真實現(xiàn)虛擬環(huán)繞聲的設計 ...................................................9 C 語言編程實現(xiàn)基于 AC3 的虛擬環(huán)繞聲系統(tǒng) ........................................9 本章小結 ...................................................................................................10第 3 章 主要技術簡介 ............................................................................................11 Dolby AC3.................................................................................................11 Dolby AC3 的特點、配置和應用 .....................................................11 Dolby AC3 的編碼原理 .....................................................................12 Dolby AC3 的解碼原理 .....................................................................13 頭相關傳輸函數(shù) .......................................................................................13 HRTF 的定義 .....................................................................................14 HRTF 數(shù)據(jù)的獲取 .............................................................................15 本章小結 ...................................................................................................17第 4 章 Matlab 編程實現(xiàn)虛擬環(huán)繞聲的設計 ........................................................18 Matlab 的特點 ...........................................................................................18 系統(tǒng)設計 ...................................................................................................18 從 AC3 文件中分離出 獨立聲道數(shù)據(jù) ........................................19 程序設計.............................................................................................22 結論分析 ...................................................................................................23 本章小結 ...................................................................................................24第 5 章 C 語言編程實現(xiàn)基于 AC3 的虛擬環(huán)繞聲系統(tǒng) .......................................25 VC++ 軟件介紹 ...................................................................................25西南科技大學本科生畢業(yè)論文 IV 程序設計背景 ...........................................................................................25 解碼原理.............................................................................................25 MDCT 和 IMDCT ..............................................................................28 程序設計 ...................................................................................................30 子函數(shù) IMDCT...................................................................................30 子函數(shù) Downmix................................................................................35 結論分析 .....................................................................................................36 本章小結 .....................................................................................................37結 論 ...................................................