发明授权
US07038600B2 Method and device for adding or extracting a secondary information signal to/from a RLL code sequence
失效
用于向/从RLL码序列添加或提取辅助信息信号的方法和装置
- 专利标题： Method and device for adding or extracting a secondary information signal to/from a RLL code sequence
- 专利标题（中）： 用于向/从RLL码序列添加或提取辅助信息信号的方法和装置
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申请号： US09929265申请日： 2001-08-14
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公开(公告)号： US07038600B2公开(公告)日： 2006-05-02
- 发明人: Willem Marie Julia Marcel Coene , Johan Cornelis Talstra , Antonius Adriaan Maria Staring , Jacobus Petrus Josephus Heemskerk
- 申请人： Willem Marie Julia Marcel Coene , Johan Cornelis Talstra , Antonius Adriaan Maria Staring , Jacobus Petrus Josephus Heemskerk
- 申请人地址： NL Eindhoven
- 专利权人： Koninklijke Philips Electronics N.V.
- 当前专利权人： Koninklijke Philips Electronics N.V.
- 当前专利权人地址： NL Eindhoven
- 代理商 Edward W. Goodman
- 优先权： EP00202846 20000814
- 主分类号： H03M7/00
- IPC分类号： H03M7/00 ; G06Q99/00 ; H04K1/00 ; H04L9/00
摘要：
A method and device for adding or extracting a secondary information signal to/from a runlength-limited code sequence, includes detecting a polarity of a runlength at a first predetermined position of the runlength-limited code sequence and setting a parameter reflecting the degree of freedom that is present in the runlength-limited channel code, e.g., the selection of a merging bit pattern in the CD-standard, on the basis of the detected polarity so as to obtain a predetermined polarity of a runlength at a subsequent second predetermined position of the runlength-limited code sequence. The predetermined polarity then corresponds to a binary value of the secondary information. Thus, a side-channel with a small capacity is provided, which is positioned very close to the physical channel such that the secondary information is hard to be detected from the EFM bit stream. Therefore, the side-channel can be used as a hidden channel for copy protection purposes.
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