Optical data storage and retrieval system and method
    1.
    发明公开
    Optical data storage and retrieval system and method 失效
    系统与Verfahren zur optischen Speicherung und Wiedergewinnung von Daten

    公开(公告)号:EP0814471A2

    公开(公告)日:1997-12-29

    申请号:EP97116979

    申请日:1992-05-11

    申请人: DISCOVISION ASS

    摘要: A first write encoder (18) encodes digital data in a first, high-density format. A second write encoder (16) encodes digital data in a second, low-density (i.e., ANSI) format. A first read decoder (28) decodes digital data from the first format. A second read decoder (26) decodes digital data from the second format. A disk drive (34) receives a replaceable 90 millimeter optical disk. A read/write head (20) reads encoded data from and writes encoded data to a 90 millimeter optical disk received by the drive. In a first mode, the first write encoder is connected between a source of digital data (10) and the read/write head, and the first read decoder is connected between the read/write head and the utilizing apparatus (410). In a second mode, the second write encoder is connected between the source and the read/write head, and the second read decoder is connected between the read/write head and the utilizing apparatus. Control electronics (30) switch between the first and second modes, depending upon the format in which data is recorded on the disk received by the disk drive. An 8/9 GCR encoder (12) and a laser pulse generator (14) are used in the first write encoder to record data on the optical media to increase the storage capacity. Improvement in timing is accomplished with write compensation and signal equalization.

    摘要翻译: 第一写入编码器(18)以第一高密度格式对数字数据进行编码。 第二写入编码器(16)以第二,低密度(即ANSI)格式对数字数据进行编码。 第一读取解码器(28)从第一格式解码数字数据。 第二读取解码器(26)从第二格式解码数字数据。 磁盘驱动器(34)接收可更换的90毫米光盘。 读/写头(20)从编码数据读取编码数据并将其编码到由驱动器接收的90毫米光盘上。 在第一模式中,第一写入编码器连接在数字数据源(10)和读/写头之间,第一读取解码器连接在读/写头与利用装置(410)之间。 在第二模式中,第二写入编码器连接在源和读/写头之间,第二读取解码器连接在读/写头与利用装置之间。 控制电子设备(30)在第一和第二模式之间切换,这取决于磁盘驱动器接收的磁盘上记录数据的格式。 在第一写入编码器中使用8/9 GCR编码器(12)和激光脉冲发生器(14)来在光学介质上记录数据以增加存储容量。 通过写入补偿和信号均衡来实现时序的改进。