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研究生:郭俊榮
論文名稱:利用聽覺遮蔽之音訊浮水印系統
論文名稱(外文):Audio Watermarking Systems using Auditory Masking
指導教授:簡福榮簡福榮引用關係
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電機工程系碩士班
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:2004
畢業學年度:92
語文別:中文
論文頁數:47
中文關鍵詞:人耳聽覺模型展頻通訊技術直接序列展頻/二元相位移鍵法直接序列展頻/相位頻譜編碼法
外文關鍵詞:Psychacoustic modelSpread spectrum communication techniqueDirect Sequence Spread Spectrum/Binary-Phase Shift Keying(DSSS/BPSK)Direct Sequence Spread Spectrum/Phase Spectrum Coding(DSSS/PSC)
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在本篇論文中,我們研究兩種基於人耳聽覺模型(Psychoacoustic Model)和展頻通訊技術(Spread spectrum communication technique)的音訊浮水印技術。一種為易碎性的直接序列展頻/相位頻譜編碼法(Direct Sequence Spread Spectrum/Phase Spectrum Coding,DSSS/PSC):將位於時域之數位浮水印嵌入於頻域的音訊訊號內,藉由改變音訊訊號小於遮蔽曲線處的相位,作為浮水印的隱藏。另一種為強健性的直接序列展頻/二元相位移鍵法(Direct Sequence Spread Spectrum /Binary-Phase Shift Keying,DSSS/BPSK):利用調整浮水印頻譜,使得浮水印的頻譜都在遮蔽門檻值(masking threshold)以下,如此浮水印可以順利的嵌入到原始訊號,且不影響音訊品質。實驗結果發現在經攻擊後,直接序列展頻/相位頻譜編碼法確具易碎性,而直接序列展頻/二元相位移鍵法,在主觀或客觀的強健性測試都有不錯的表現。
With rapid development of digital signal processing and the Internet communication, digital audio in market is apt to be illegally transported and duplicated by people. Two audio watermarking schemes that make use of human auditory masking and spread spectrum communication are investigated for the purpose of ownership declaration of intellectual property. One scheme employs the direct sequence spread spectrum and phase spectrum coding (DSSS/PSC), and the other applies the direct sequence spread spectrum and binary phase-shifting keying (DSSS/BPSK) to embed digital watermark into cover audio without sacrificing the perceptual quality. The former is by changing the phase and the latter adjusts the magnitude of the frequency spectrum that is below the auditory masking threshold of the cover audio. The experimental results show that the extracted correct rates are at least 99.64 % for both DSSS/PSC and DSSS/BPSK schemes. When suffering an attack, e.g. MP3 compression, resampling, and filtering, etc, the performance of DSSS/BPSK is shown to be more robust than that of DSSS/PSC. On the contrary, the DSSS/PSC scheme is proved to be a good fragile watermarking for protecting the cover audio.
摘要 i
ABSTRACT ii
誌謝 v
目錄 vi
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1音訊浮水印的用途及由來 1
1.2音訊浮水印的特性 2
1.3 研究動機與論文章節 3
第二章 音訊浮水印技術 5
2.1音訊浮水印的基本架構 5
2.2人耳聽覺模型(Psychoacoustic Model) 7
2.1音訊浮水印技術簡介 11
第三章 利用聽覺遮蔽之音訊浮水印系統 15
3.1浮水印訊號產生器 16
3.2音訊訊號處理器 18
3.3直接序列展頻/相位頻譜編碼法(DSSS/PSC)的嵌入與取出 21
3.4直接序列展頻/二元相位移鍵法(DSSS/BPSK)的嵌入與取出 26
第四章 實驗模擬與品質評估 29
4.1音訊資料庫及客觀測試準則 29
4.2主客觀品質測試 30
4.3浮水印強健性及易碎性測試 32
第五章 結論與展望 44
參考文獻 45
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