发明名称 |
System and apparatus for recovering information from a record currier which exhibits variations of two different physical parameters thereof |
摘要 |
An information system including a record carrier and a playback apparatus. Information has been recorded on the record carrier in the form of variations of a first physical parameter. The playback apparatus scans the record carrier by means of a transducer which is responsive to the variations of the first physical parameter. An information recovering circuit recovers the information from a detection signal received from the transducer. The record carrier also exhibits second variations of a second physical parameter, which differs from the first physical parameter, but which second variations are of a type that are detectable by the transducer. A detection circuit detects the presence of the second variations or a predetermined property thereof (e.g., that they exhibit a predetermined variation pattern) on the basis of the detection signal received from the transducer. A circuit responsive to the detection circuit enables the information recovering circuit, when the presence of the second variations or a predetermined property of the second variations is detected, causing it to recover the information.
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申请公布号 |
US5737286(A) |
申请公布日期 |
1998.04.07 |
申请号 |
US19950389445 |
申请日期 |
1995.02.15 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
TIMMERMANS, JOZEF M. K.;SCHYLANDER, ERIK C.;MONS, JOHANNES J. |
分类号 |
G11B7/00;G11B5/00;G11B5/012;G11B5/74;G11B5/86;G11B7/0037;G11B7/005;G11B7/007;G11B7/013;G11B7/09;G11B9/00;G11B13/00;G11B19/02;G11B19/04;G11B19/12;G11B20/00;G11B20/10;G11B20/18;G11B23/28;H04N5/913;(IPC1-7):G11B7/095 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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