| Original document(47 pages) 中文版 |
This invention provides a copy-protected optical disk (9), a reproduction apparatus (47) of the optical disk, a reproduction method of the optical disk, a production method of an original disk of the optical disk and a method of preventing an illegal program operation. An area in which a CP signal (24) having the center of an eye pattern deviated from the center of an amplitude is recorded is disposed at the back of a predetermined pattern signal in the optical disk. A reproduction apparatus additionally has the function of detecting an arrangement information (25) of the CP signal or a CP preceding signal (26), applying an offset voltage to a threshold value at the time of demodulation of an RF signal to a digital signal to change the threshold value, normally reproducing the signal having the center of the eye pattern deviated from the center of the amplitude, and stopping reproduction when a predetermined offset signal is not reproduced. |
Application Number
申请号 |
200610101832 |
Application Date
申请日 |
1994.12.28 |
| Title 名称 |
Optical disk, reproducing apparatus and recording apparatus |
Publication Number
公开号 |
1909098 |
Publication Date
公开日 |
2007.02.07 |
| Approval Pub. Date |
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Granted Pub. Date |
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| International Classification 分类号 |
G11B20/10;G11B7/00 |
Applicant(s) Name
申请人 |
Matsushita Electric Ind Co., Ltd. |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Ueno Fumiaki;Oshima Mitsuaki |
| Attorney & Agent 代理人 |
liang yong |
| More information 更 多 信 息 |
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