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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 吳家麟(Ja-Ling Wu) | |
dc.contributor.author | Chih-Hung Lin | en |
dc.contributor.author | 林志宏 | zh_TW |
dc.date.accessioned | 2021-05-20T21:38:15Z | - |
dc.date.available | 2011-08-17 | |
dc.date.available | 2021-05-20T21:38:15Z | - |
dc.date.copyright | 2010-08-17 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-08-13 | |
dc.identifier.citation | [1] Po-Wei Chen, Chun-Hsiang Huang, Yun-Chung Shen, Ja-Ling Wu, Pushing Information over Acoustic Channels. ICASSP Proc. of the 2009 IEEE Int. Conf. on Acoustics, Speech and Signal Processing, 1421-1424.
[2] Chun-Hsiang Huang, Po-Wei Chen, Ping-Yen Hsieh, and Ja-Ling Wu, “Information Delivery systems for Car Passengers without Networking Capabilities,” In Proceedings of the Pacific-Rim Conference on Multimedia, pp. 539-548, December 2007. [3] Nevena Lazic and Parham Aarabi, “Communication over an Acoustic Channel Using Data Hiding Techniques,” IEEE Transactions on Multimedia, Volume 8, Issue 5, pp. 918-924, October 2006. [4] Nakashima, Y. Matsuoka, H. Yoshimura, T. Evaluation and Demonstration of Acoustic OFDM. Signals, Systems and Computers, 2006. ACSSC ’06. [5] Matsuoka, H., Nakashima, Y., Yoshimura, T., Kawahara, T. Acoustic OFDM: embedding high bit-rate data in audio. Intl. Multimedia Modeling Conf. 2008, pp. 498-507 (2008) [6] Matsuoka, H., Yoshimura, T., Kawahara, T. Acoustic OFDM system and its extension. In Vis. Comput(2009) 25: 3-12 [7] D. Gruhl, A. Lu and W. Bender. Echo Hiding, Information Hiding 1996, pp. 295-315 [8] Yardimei, Y., Cetin, A.E., Ansari, R. Data hiding in speech using phase coding. In Eurospeech 97, pp. 1679-1682 (September 1997) [9] R. Hashemian, Memory efficient and high-speed search Huffman coding, IEEE Trans. on Comm., vol. 43, pp. 2576-2581, 1995. [10] William Y. Zou, Yiyan Wu, COFDM: An Overview. IEEE Trans. on Broadcasting, vol. 41, No. 1, March 1995 [11] Teknisk Dokumentsenter, Running Fourier Transforms. Electronics World, Nov 1998 [12] L. Boney, A.H. Tewfik and K. N. Hamdy. Digital watermarks for audio signals, IEEE Ind. Conf on Multimedia Computing and System, pp473-380, Mar. 1996. [13] ISO/IEC 11172-3:1993 Information technology -- Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s -- Part 3: Audio [14] Jiangtao Xi and Joe F. Chicharo, “Computing Running DCTs and DSTs Based on Their Second-Order Shift Properties,” IEEE Transactions on Circuits and Systems - I: Fundamental Theory and Applications, Volume 47, Issue 5, pp. 779-783, May 2000. [15] Stephen B. Wicker and Vijay K. Bhargava, “Reed-Solomon Codes and Their Applications,” IEEE Press, ISBN 0-7803-5391-9, September 1999. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10546 | - |
dc.description.abstract | 由於手持式運算設備的普及,隱藏性聲音通道是一個低成本的資訊傳遞工具。過去,此類通訊系統有兩派主流作法,其一利用正交分頻多工技術,傳輸效果好,但聲音品質差;其二利用展頻浮水印的技巧,將資訊隱藏在聲音當中,此法聲音品質較佳,但傳輸能力有限。
我們重新測量聲音通道的表現及特徵,進而針對展頻浮水印之通訊系統提出了兩個不同層次的強化方法:通訊方法階段採用了適應分頻技術,在不影響聲音品質的前提下,增加了傳輸能力;而在資料處理階段,利用霍夫曼編碼提昇傳輸效率。最終在整體表現上,我們維持了好的聲音品質,並達到了較好的傳輸速率。 | zh_TW |
dc.description.abstract | Due to the growing popularity of handheld devices, using sound to pass information from audio source to mobile becomes a possible application. Although the throughput offered by channel is relatively low and the quality of audio is not as good as the original, it provides a costless solution for communication with mobile devices through acoustic channel. Many interesting applications based on such communication systems have been proposed.
To reach the goal, spread spectrum watermarking technologies have been considered before, but the achieved throughput is very low. Another approach called “Acoustic OFDM” is proposed. The achieved transmission rate is superior to that of the SS-based method, but its associated quality of audio is controversial. We proposed two-level enhancement for spread spectrum watermarking based communication over the hidden aerial acoustic channel. It makes the throughput more than “Acoustic OFDM” method, but keeps the quality of audio as good as SS-based method. | en |
dc.description.provenance | Made available in DSpace on 2021-05-20T21:38:15Z (GMT). No. of bitstreams: 1 ntu-99-R97922038-1.pdf: 1911080 bytes, checksum: 6893b4f6c7b696a9fdca94dd4f77f027 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 誌謝 i
中文摘要 ii ABSTRACT iii CONTENTS iv LIST OF FIGUREURES vi LIST OF TABLES viii Chapter 1 Introduction 1 Chapter 2 Related Work 7 2.1 Hidden Acoustic Communication System Overview 7 2.2 Related Works 9 2.2.1 Spread spectrum based method 9 2.2.2 Acoustic OFDM [6] 12 Chapter 3 Channel Investigation 15 3.1 Channel Overview 15 3.2 Channel Responses 16 Chapter 4 Modulation Level Enhancement 21 4.1 Increasing Codebook Size 21 4.2 Frequency Division 23 4.2.1 Overview 23 4.2.2 Embedding Procedure 24 4.2.3 Waveform-level synchronization 25 4.2.4 Extraction procedure 27 4.2.5 Disadvantage 28 4.3 Adaptive Frequency Division 29 4.3.1 Overview 29 4.3.2 Embedding procedure 30 4.3.3 Waveform-level synchronization 31 4.3.4 Extraction procedure 32 Chapter 5 Data-Level Enhancement 33 5.1 Overview 33 5.2 Error Propagation Caused by Huffman Codes 34 5.3 Controlling Mechanism of Error Propagation 35 Chapter 6 Experiments 38 6.1 Environmental Configurations and System Parameters 38 6.1.1 Environmental configurations 38 6.1.2 Acoustic OFDM parameters 38 6.1.3 The parameters of the proposed approach 39 6.2 Subjective Quality Test 40 6.3 Transmission Performance 43 6.3.1 Factors 43 6.3.2 Results 45 Chapter 7 Conclusions and Future Work 48 7.1 Conclusions 48 7.2 Future Work 48 REFERENCES 49 | |
dc.language.iso | zh-TW | |
dc.title | 展頻隱藏性聲音通訊之二層強化及其應用 | zh_TW |
dc.title | A Two-Level Enhancement for Spread Spectrum Based Hidden Aerial Acoustic Communications and its Applications | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳文進,周承復 | |
dc.subject.keyword | 展頻浮水印,正交分頻多工,通訊系統, | zh_TW |
dc.subject.keyword | acoustic channel,data hiding,Huffman codes,synchronization,OFDM,frequency division,communication system, | en |
dc.relation.page | 50 | |
dc.rights.note | 同意授權(全球公開) | |
dc.date.accepted | 2010-08-15 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 資訊工程學研究所 | zh_TW |
顯示於系所單位: | 資訊工程學系 |
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