发明名称 |
Information transmission method, information duplication prohibiting method, information duplication prohibition device and information crevording medium |
摘要 |
The level of the spectrally spread anti-duplication control signal to be superimposed on an information signal such as a video signal is changed by using a random number RD generated by a random number generation unit 163. Since it is difficult to follow after the change of the level of the spectrally spread anti-duplication control signal, elimination of the anti-duplication control signal from the information signal is made further difficult. This can reliably provide the anti-duplication control signal to the receiving side.
|
申请公布号 |
US6453118(B2) |
申请公布日期 |
2002.09.17 |
申请号 |
US19970968118 |
申请日期 |
1997.11.12 |
申请人 |
SONY CORPORATION |
发明人 |
SUGITA TAKEHIRO;OGINO AKIRA;USUI TAKASHI |
分类号 |
H04N5/91;G11B20/00;G11B20/10;H04J13/00;H04N5/913;H04N7/167;(IPC1-7):H04N5/91 |
主分类号 |
H04N5/91 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|