As systems employing multichannel audio more and more, it is necessary to consider the surround sound capability in the process of the sound recording and playing. This paper presents a structured audio format and its application to design more efficient surround sound system. 3D sound technology is used for localization of sound source. We defined the reusable sound object to clarify the audio format. Sound object is a unit of recorded sound samples that can be changed by various effect properties. Filter and 3D property are applied to change the sound objects in each track.
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