本論文主要討論MPEG-4進階音響解碼在系統晶片(SoC)發展軟體即時解碼器之實現。根據系統晶片中ARM與數位訊號處理器(DSP)的硬體，探討如何使兩者溝通以達到即時解碼並播放聲音的方法。此外提出一個基於HHT(Hilbert-Huang transform)求基週(pitch)的方法，以期能運用在MPEG-4進階音響編碼的長期預測(Long term prediction)功能中。

The research of this thesis focuses on the implementation of MPEG-4 advanced audio coding (AAC) real-time software decoder. We discuss the issue of communication between ARM and DSP on Soc to implement real-time decoding and playing. Furthermore, this thesis presents an approach to determine pitch based on Hilbert Huang transform expecting that it can be applied to long term prediction of MPEG4-AAC.

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