Audio Data Hiding Using Phase Coding
Date Issued
2006
Date
2006
Author(s)
Lin, Pei-Jung
DOI
en-US
Abstract
Abstract
In the last few years, with the fast growing digital communication, the world has evolved into a multimedia age with booming Internet connectivity. It has become very easy to obtain and download digital data. However, easy access and duplication have posed serious problem of piracy in media distribution. The watermarking and data hiding techniques are researched and developed to protect the copyright of owner and the author. In addition, musical signal has its own special property, tempo and beat algorithm is also an interesting researching.
Two data hiding in audio schemes and one tempo and beat algorithm are presented in this thesis. The hiding schemes are based on phase. First scheme uses the property of wave interference, consider two waves are in phase, they will have constructive interference; out of phase, then destructive interference. We can use this property to hiding data in audio and optical. The decryption may not necessary need computer but can accomplished by human observation as well. The other encryption method uses reference phase to modify the phase value to hide the data. These two methods are not suspicious and are easy in encoding and decoding.
Musical signal is not like general audio, it has its unique property. These properties, like pitch, rhythm, and key etc. We present the property with the viewpoint from music and its corresponding searching algorithm. Then we focus on tempo and beat analysis and implement Scheirer’s algorithm and compare the result with human tapping.
Subjects
相位
音訊
浮水印
追蹤拍子
Phase coding
Audio
Data hiding
Watermarking
Beat tracking
Type
thesis
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