发明名称 |
REPRODUCING DEVICE OF DISC-SHAPED RECORDING MEDIUM |
摘要 |
PURPOSE:To detect an index signal more accurately by opening a gate circuit to stop the supply of the output of a reproduced index signal detector to an index signal self-oscillating circuit in case of tracking muting or drop-out. CONSTITUTION:An index signal self-oscillating circuit 14 is synchronized with the reproduced index signal outputted fron a repeoduced index signal detecting circuit 3 of the peaking system, and switching between the first and the second tracking signals is controlled throgh a switching circuit 8 in accordance with the output of the index signal self-oscillating circuit 14. A gate circuit 16 is opened by a tracking mute control signal delayed by a delay circuit 17 to inhibit the control of the index signal self-oscillating circuit 14 due to the reproduced index signal when tracking is turned off. The delay circuit 17 delays the signal by a time corresponding to the leading-in time of a tracking control circuit to continue the inhibition in the switching time from tracking turn-off to turn-on also. |
申请公布号 |
JPS61978(A) |
申请公布日期 |
1986.01.06 |
申请号 |
JP19840122387 |
申请日期 |
1984.06.14 |
申请人 |
MATSUSHITA DENKI SANGYO KK |
发明人 |
SUGITA AKIHISA;KIMURA TOMONOBU;ABE MASAYOSHI;TERADA YUUJI |
分类号 |
G11B9/06;G11B21/10 |
主分类号 |
G11B9/06 |
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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