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研究生:何宜倫
研究生(外文):Yi-Lun Ho
論文名稱:以諧頻調變方式作音訊浮水印設計
論文名稱(外文):Audio Watermarking Based on Harmonic Amplitude Modification
指導教授:王小川王小川引用關係
指導教授(外文):Hsiao-Chuan Wang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:70
中文關鍵詞:數位浮水印音訊浮水印諧頻調變量化索引值調變
外文關鍵詞:Digital watermarkingAudio watermarkingHarmonic amplitude modificationQuantization Index Modulation
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由於寬頻網路快速發展以及壓縮技術之進步, 多媒體檔案遭非法傳佈及盜版之情形日益嚴重. 為遏止此一現象, 可在資訊本身加密之數位浮水印技術已被廣泛研究.本論文首先對數位浮水印之定義及基本需求做一簡介, 再針對目前現有的音訊浮水印技術作一探討. 而後基於線上音樂購買機制的需求, 提出一個可在音訊中隱藏資訊之音訊浮水印技術, 其特點為利用聽覺敏感部位進行資訊隱藏, 而非一般現行的以聽覺遮蔽效應為基礎的設計. 因此部位有較佳的強健性, 故可使用較少的係數, 而仍能達到極佳的浮水印解回率. 由於利用聽覺敏感部位隱藏, 故需發展其它能消除聽覺失真之演算法. 在本論文中, 我們以音訊中的諧頻(Harmonic) 部份做資訊隱藏, 因音訊的特色主要是由其諧頻部份決定, 故可視為聽覺敏感部位. 在隱藏位元資訊之演算法方面, 我們採取了量化索引值調變法(Quantization Index Modulation). 另外我們也發展了音訊同步(Audio Synchronization) 與區塊切割(Block Segmentation) 等演算法, 使得整套系統能自動地處理完整的音訊. 經實驗證明, 此音訊浮水印解回率有99%以上, 而即使經過一般的信號處理(數位-類比轉換, 低通濾波, 或有損壓縮等) 下, 仍能有90%以上的解回正確率. 而人耳無法察覺其失真. 未來的工作則是嘗試依據不同音訊的類型給予不同的系統參數, 以達到更高的浮水印解回率.

Digital watermarking is regarded as an effective method for copyright protection of digital multimedia files. This paper proposed a new algorithm that hides the binary information in audio signal by modifying magnitudes of harmonic components. The harmonic components are significant in the auditory perception and are supposed to be more robust than the masked area, which is utilized in conventional audio watermarking techniques. Relative algorithms are also developed to make it possible to process a complete audio data automatically. The experiment results confirm that the watermark has a recovery accuracy above 90% after the watermarked data is attacked by most commonly used signal processing, such as digital-analog conversion, low-pass filtering, and lossy compression.

Chapter 1 Introduction
Chapter 2 A Survey of Current Audio Watermarking Techniques
Chapter 3 Proposed Audio Watermarking Technique
Chapter 4 Experimental Results
Chapter 5 Conclusions and Future Works

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