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    Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data
    3.
    发明授权
    Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data 失效
    利用记录介质的非记录部分来表示数据的光磁存储器件

    公开(公告)号：US4939710A

    公开(公告)日：1990-07-03

    申请号：US214930

    申请日：1988-07-01

    申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Toshihisa Deguchi ,  Shozou Kobayashi

    发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Toshihisa Deguchi ,  Shozou Kobayashi

    IPC分类号： G11B11/105

    CPC分类号： G11B11/10515 ,  G11B11/10506 ,  G11B11/10597

    摘要： An optical magnetic memory device includes an optical magnetic recording medium such as a disc having recording magnetic film at least on one side thereof and initialized in a certain direction in advance, a recording section for recording data in such a manner that data-recorded portions and non-recorded portions are alternately formed, and a reproducing section for reproducing data from the recording medium by detecting the interval between the recorded or non-recorded portions. The reproducing section comprises a detector for detecting positive and negative peaks of signals reproduced from the recorded or non-recorded portion and a selector for selecting either of the detection outputs from the detector according to a control signal.

    摘要翻译： 一种光磁存储器件包括：光磁记录介质，例如至少在其一侧具有记录磁膜的光磁记录介质，并且预先沿某个方向初始化;记录部分，用于以数据记录部分和 交替地形成非记录部分，以及再现部分，用于通过检测记录或非记录部分之间的间隔从记录介质再现数据。 再现部分包括检测器，用于检测从记录或非记录部分再现的信号的正峰值和负峰值，以及选择器，用于根据控制信号选择来自检测器的检测输出。

    Optical disc record reproducing apparatus
    4.
    发明授权
    Optical disc record reproducing apparatus 失效
    光盘记录重放装置

    公开(公告)号：US4788674A

    公开(公告)日：1988-11-29

    申请号：US902593

    申请日：1986-09-02

    申请人： Shigemi Maeda ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shozou Kobayashi

    发明人： Shigemi Maeda ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shozou Kobayashi

    IPC分类号： G11B7/005 ,  G11B7/125 ,  G11B11/105 ,  G11B27/36 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B27/36 ,  G11B7/005

    摘要： An optical disc apparatus provided with a recording correcting system for controlling variations in the recorded bit length. The recording correcting system may be controlled not only while the apparatus is put to work, but also during unoccupied times when the recording, reproducing, and erasing operations are not required from a higher level apparatus. Also, the controlling operation may be performed so that the value of the record correction may be renewed at proper time intervals. The repetition of the correction trial at the proper interval allows a time lapse after the apparatus power-supply is put to work to occur with no undesirable effects and the characteristic variation between respective discs during the disc exchange can be coped with.

    摘要翻译： 一种具有记录校正系统的光盘装置，用于控制记录位长度的变化。 记录校正系统不仅可以在设备工作时被控制，而且可以在不需要较高级设备的记录，再现和擦除操作的空闲时间期间被控制。 此外，可以执行控制操作，使得可以以适当的时间间隔更新记录校正的值。 以适当的间隔重复校正试验允许在设备供电工作发生之后发生不期望的影响的时间流逝，并且可以应对在盘更换期间各个盘之间的特性变化。

    Waveform processing circuit
    8.
    发明授权
    Waveform processing circuit 失效
    波形处理电路

    公开(公告)号：US4785252A

    公开(公告)日：1988-11-15

    申请号：US916644

    申请日：1986-10-08

    申请人： Hiroshi Fuji ,  Takashi Iwaki ,  Tsuneo Fujiwara ,  Toshihisa Deguchi ,  Shozou Kobayashi

    发明人： Hiroshi Fuji ,  Takashi Iwaki ,  Tsuneo Fujiwara ,  Toshihisa Deguchi ,  Shozou Kobayashi

    IPC分类号： G11B5/035 ,  G11B20/10 ,  H03K5/00 ,  H03B1/00

    CPC分类号： G11B5/035 ,  G11B20/10009

    摘要： A waveform processing circuit includes a switching circuit having first and second inputs and one output. The first input receives head portions and data portions contained in a reproduced signal from an optical head. The second input receives a level signal representing the level of the head portion or the level of the signal carrying the head portion. The switching circuit is switches between a first state in which the first input and the output are connected, and a second state in which the second input and the output are connected. A control signal producer produces a first control pulse indicating the presence of the data portion. The first control pulse is applied to the switching circuit for actuating the switching circuit to establish the first state when the first control pulse is present, and to establish the second state when the first control pulse is not present, so that the switching circuit continuously produces the signal having a level within the range of the head portion. Thus, no abrupt change caused by transient phenomena will be observed in a high pass filter connected to the switching circuit.

    摘要翻译： 波形处理电路包括具有第一和第二输入和一个输出的开关电路。 第一输入接收来自光学头的再现信号中包含的头部和数据部分。 第二输入接收表示头部的电平的电平信号或承载头部的信号的电平。 切换电路是在连接第一输入和输出的第一状态与第二输入和输出连接的第二状态之间进行切换。 控制信号产生器产生指示数据部分的存在的第一控制脉冲。 当存在第一控制脉冲时，第一控制脉冲被施加到用于致动切换电路以建立第一状态的开关电路，并且当不存在第一控制脉冲时建立第二状态，使得开关电路连续产生 该信号具有在头部的范围内的电平。 因此，在连接到开关电路的高通滤波器中不会观察到由瞬态现象引起的突然变化。