A Research and Implementation of MPEG-4 AudioBIFS System

• Main Authors: Fan, Mei-Yu, 范美玉
• Other Authors: 陳文進
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/65274309506390625525

碩士 === 國立臺灣大學 === 資訊工程學研究所 === 90 === 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.