近幾年來，數位音訊編碼變得越來越受歡迎以及重要，而MP3格式則是由 MPEG 組織所制訂的一種數位音訊壓縮格式，由於其高壓縮率以及高音質的特性，MP3已經被廣泛地應用於網際網路的傳輸和多媒體的應用上。
　　
　　本論文中，我們利用軟硬體共同設計方式在ARM-based平臺上設計一MP3解碼器，經由複雜度的分析以及整體效能的評估，我們將運算複雜度較高且運算較規則的部分(IMDCT 和synthesis filterbank)用硬體來實現，其他大量控制和指標索引做判斷的部分則用軟體來完成。最後我們將此MP3解碼器的軟硬體透過AMBA介面在ARM-based 平台上做驗證，結果分析顯示，經過軟硬體共同設計後，此MP3解碼器比純軟體的情形下提高了87%的效能並能達到即時播放，在音質的測試方面，也能符合ISO所制訂的高音質標準。

　　In recent years, digital audio coding is becoming increasingly popular and essential. MP3, the well-known compression format, is categorized as one of the MPEG standards for digital audio compression. Because of its high compression rate and high sound quality, MP3 has been applied extensively for internet transmissions and multimedia applications.
　　
　　In this thesis, we use a platform-based HW/SW co-design methodology to design a MP3 decoder on the ARM-based platform. According to the experimental results of the complexity analysis and overall efficiency estimation, we implement the computation-intensive and regular operation components (IMDCT and synthesis filterbank) in hardware, the other control-oriented and index decision making part in software. Furthermore, the MP3 decoder is verified through AMBA interface on ARM-based platform. The experimental results show that the MP3 decoder under HW/SW co-design improves 87% performance compared with the pure-software implementation, and achieves the real-time processing. Moreover, the sound quality also meets the ISO standard.

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