MPEG-4是一個以物件為基礎，新一代的多媒體壓縮標準，並提出了一套完整的多媒體整合架構。在MPEG-4中，除了制定處理聲音和影像的技術之外，還制定了如何將這些影音物件整合呈現，組成場景(Scene)的方法。AudioBIFS即是在MPEG-4標準中，用來編輯合成聲音物件、描述聲音場景的相關部分。
透過AudioBIFS，能夠使聲音在接收端即時(Real-Time)合成播放，讓聲音的呈現更有互動性。媒體內容的作者可以透過AudioBIFS，描述並產生一個動態即時的場景內容，可以根據使用者當時的需求，對聲音做即時後處理的動作，如動態的混音，調整輸出的聲道以及延遲聲音的播放，或是加入聲音的特效。另外，根據場景的內容與使用者當時的狀態，即時產生具空間感的3D聲音，或是產生適當的空間回音，重現一個虛擬場景的聲音效果，增加虛擬場景的真實性。
本篇論文綜合描述AudioBIFS相關的研究與資料，並提出一個AudioBIFS的實作，內容包括聲音來源的處理，聲音透過AudioBIFS做後處理的部分，以及聲音的輸出與場景中其他物件同步播放的考量。

MPEG-4 is an object-based international standard for multimedia. It provides a complete architecture for integrating comprehensive media objects in multimedia applications. Besides compression technologies of audio and video objects in MPEG-4, there is a framework to compose these media objects into visual-audio scene in the playing time rather than in the editing time. AudioBIFS is a part of MPEG-4 standard for composing audio objects and describing audio scenes.
AudioBIFS describes audio scenes for interactive presentation, because the audio objects can be real-time composed and played in client side. Content authors can use AudioBIFS to describe a real-time interactive audio scene. According to the needs of users, audio objects is post-produced to mix with other sounds, change number of output channels, delay output or add sound effect at real-time. Also, It can produce 3D spatialization sound according to the environment of scene and the state of users, which recreate a virtual scene to be more realistic.
This thesis presents an overview of the AudioBIFS system and describes the current state of implementations of AudioBIFS system which including manipulation of sound source, sound post-production and synchronization of playing sound.

第一章 緒論 9
1.1 前言 9
1.2 MPEG-4系統特色 10
1.3 MPEG-4規格簡介 10
1.4 MPEG-4場景描述架構簡介 13
1.5 論文章節編排 15
第二章 AudioBIFS的內容與功能 16
2.1 AudioBIFS簡介 16
2.2 第一版AudioBIFS的內容與功能 19
2.3 第二版AudioBIFS的內容與功能 25
第三章 領域現況 35
第四章 AudioBIFS的系統實作 37
4.1 實作系統簡介 37
4.2 聲音呈現的機制與節點資源的管理 39
4.3 聲音輸入模組的實作─聲音來源的處理 40
4.3.1 DirectShow簡介 40
4.3.2 DirectShow過濾器與管理模組的實作 43
4.4 聲音輸出模組的實作─聲音的播放與系統同步的考量 47
4.4.1 DirectSound簡介 47
4.4.2 聲音輸出模組簡介 49
4.4.3 流暢輸出的處理 50
4.4.4 聲音與其他物件同步輸出的處理 52
4.4.5 爆音的處理 55
4.5 AudioBIFS後處理模組的實作─聲音的後處理 56
4.5.1 如何驅動聲音資料的流動 57
4.5.2 時間資訊欄位的處理 58
4.5.3 pitch欄位的處理 61
第五章 結論及未來工作 65
5.1 結論 65
5.2 未來工作 65
參考文獻 66

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