臺灣博碩士論文加值系統

由於目前網路發達，MP3檔案傳輸相當普遍由於MP3可調式音訊編碼技術並未制定於ISO/IEC標準中，故本論文提出一套新穎的MP3可調式音訊編碼技術─誤差平均法，並將此法與BSAC之方法做比較。實驗結果顯示，使用此方法在Stereo及Mid-side stereo之音訊編碼格式中，不論高碼率或低碼率，皆比BSAC方法更有效率。

MP3 is most popular audio coding standard in the Internet. People usually download MP3 files through the Internet. However, scalable MP3 audio coding is not established in ISO/IEC standard. In our research, we propose a novel scalable audio coding approach for MP3, called Error Average Coding. We compare the performance of our and the BSAC approach. The simulation result show that our approach has higher average ODG scores than other approaches for both stereo and M/S stereo format in either high or low bit rates.

中文摘要 i
英文摘要 ii
誌 謝 iii
目 錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究背景與目的 3
1.3 章節編排 3
第二章 MPEG-1 Layer 3 音訊編解碼原理 4
2.1 聽覺心理學 4
2.1.1 絕對聽覺門檻 4
2.1.2 臨界頻帶 5
2.1.3 遮蔽效應 6
2.1.4 時域之遮蔽效應 7
2.2 MP3音訊框結構介紹 7
2.2.1 標頭 8
2.2.2 錯誤偵測碼 10
2.2.3 旁資訊 11
2.2.4 主要資料 12
2.3 MP3編碼過程 14
2.3.1 聽覺心理學模型 14
2.3.2 分析子頻帶濾波器 15
2.3.3 修改過餘弦函數 16
2.3.4 重複迴圈 16
2.3.5 霍夫曼編碼 19
2.4 解碼過程 21
2.4.1 MP3解碼過程 22
2.4.2霍夫曼解碼 23
2.4.3反量化程序 23
第三章 MPEG-4可調式編碼簡介 25
3.1 失真可調式音訊編碼技術 26
3.2 非失真可調式音訊編碼技術 27
3.3 細粒音訊 28
3.3.1 算術編碼 29
3.3.2 位元切片算術編碼 32
第四章 可調式MP3音訊編碼 36
4.1 ODG理論值分析 36
4.2 MP3失真式可調技術方法分析 37
4.2.1 失真式可調編碼利用時域誤差訊號 37
4.2.2 失真式可調編碼利用BSAC 39
4.2.3 失真式可調編碼利用量化差值編碼法 42
第五章 新穎的失真可調式編碼法─誤差平均法 51
5.1 計算頻帶的變異量 52
5.2 頻帶分配模式 55
5.3 誤差平均編碼法及位元流格式 59
5.4 實驗結果與比較 61
5.4.1雙聲道實驗結果與比較 62
5.4.2 Mid-side雙聲道實驗結果與比較 64
第六章 結論與展望 68
6.1 結論 68
6.2 展望 69
參考文獻 71

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