| 发明名称 |
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| 摘要 |
PURPOSE:To improve the error rate after demodulation without decelerating the data transfer speed by using the reflected light produced by the recording light to detect assuredly a drop-out during the recording of information and processing the defective record. CONSTITUTION:A focus error signal b' whose gain is controlled in response to the reflected ligh quantity given from an optical record disk 2 and a tracking error signal c' are supplied to a drop-out detecting circuit 41 and 42 respectively and compared with a reference level to be delivered and turned into pulses. The drop-out inspection parts 49 and 50 count the width, number, etc. of drop-outs in a recording mode and send these count data to a controller 21. The controller 21 inhibits the transmission of a record gate signal (e) to a digital modulation part 51 when it decides the presence of such a drop-out with which the incapability is expected for error correction when an information recording area which is under a record mode is demodulated. Instead the controller 21 sends a record gate signal (f) to a discriminating signal generator 52 and performs control so as to record to the defective record discriminating signal at the last part of the information recording area. |
| 申请公布号 |
JPH0154778(B2) |
申请公布日期 |
1989.11.21 |
| 申请号 |
JP19830228705 |
申请日期 |
1983.12.02 |
| 申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
KOISHI KENJI;SATO ISAO;MATSUO TAMOTSU;MORYA MITSURO |
| 分类号 |
G11B7/00;G11B7/004;G11B7/0045;G11B20/18;G11B27/36 |
主分类号 |
G11B7/00 |
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