公开(公告)号：US5365501A

公开(公告)日：1994-11-15

申请号：US853863

申请日：1992-03-20

申请人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Toshihisa Deguchi

发明人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Toshihisa Deguchi

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0055 ,  G11B11/105 ,  G11B20/10 ,  G11B27/19 ,  G11B27/30 ,  G11B17/32

CPC分类号： G11B11/1053 ,  G11B11/10597 ,  G11B20/10 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/004

摘要： An information recording and reproducing device records, erases and reproduces information on and from a memory device. The memory device has pre-format sections. The information recording and reproducing device includes a pre-recorded area detection circuit for detecting a pre-recorded area having information predeterminately recorded and located on the memory device and timing control circuits for providing timing control of an information recording, erasing or reproducing operation according to a pre-recorded area detecting signal released from the pre-recorded area detection circuit, thereby enabling each timing of recording, reproducing, or erasing operation is accurately determined. The timing control may be performed according to both of the pre-recorded area detecting signal of the present invention and the conventional synchronization detection signal. In that case, if an error should occur in the synchronization detection signals, since the pre-recorded area detecting signal is released every time pre-recorded information for a sector mark or the like is reproduced, an accurate timing control without time lag is achieved according to the pre-recorded area detecting signals.

摘要翻译： 信息记录和再现设备在存储设备上记录，擦除和再现信息。 存储器设备具有预格式化部分。 信息记录和再现装置包括一个预先记录的区域检测电路，用于检测具有预先记录和定位在存储装置上的信息的预先记录的区域和定时控制电路，用于提供根据以下的信息记录，擦除或再现操作的定时控制 从预记录区域检测电路释放的预先记录区域检测信号，从而能够准确地确定记录，再现或擦除操作的每个定时。 可以根据本发明的预先记录的区域检测信号和传统的同步检测信号来执行定时控制。 在这种情况下，如果在同步检测信号中发生错误，则由于每当再现用于扇区标记等的预先记录的信息被再现时，预先记录的区域检测信号被释放，所以实现了没有时间延迟的准确的定时控制 根据预先记录的区域检测信号。

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。

公开(公告)号：US5546364A

公开(公告)日：1996-08-13

申请号：US311452

申请日：1994-09-26

申请人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

发明人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/013 ,  G11B11/105 ,  G11B13/04 ,  G11B7/12 ,  G11B11/12

CPC分类号： G11B7/24085 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10528 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/013

摘要： A magneto-optical memory apparatus for enhancing the recording density of a magneto-optical recording medium, thereby to increase its recording capacity. The magneto-optical recording medium having recording marks, each having two ends in which information is recorded. The apparatus also includes an optical head arranged such that at the time of recording onto the magneto-optical recording medium, the recording marks are recorded such that the ends of each recording mark correspond to a second code of digital information composed of two different types of codes; at the time of reproduction, a light beam having a condensing spot is projected to the magneto-optical recording medium and, when a reproduction light containing reproduction information is entered to the optical head from the magneto-optical recording medium, a reproduction signal is supplied; and when the light beam is projected to a recording mark, an information pulse corresponding to the second code is generated in the reproduction signal, only when the reproduction light from the recording mark interferes with the reproduction light from the non-marking part; and a signal detector circuit for detecting the information pulse in the reproduction signal obtained from the optical head and for converting the reproduction signal into a digital reproduction signal.

摘要翻译： 一种用于增强磁光记录介质的记录密度的磁光存储装置，从而提高其记录容量。 具有记录标记的磁光记录介质，每个记录标记具有记录信息的两端。 该装置还包括一个光学头，其被配置为使得在记录到磁光记录介质上时，记录标记被记录为使得每个记录标记的端部对应于由两种不同类型的 代码; 在再现时，将具有聚光点的光束投影到磁光记录介质，并且当从磁光记录介质将包含再现信息的再现光输入到光头时，提供再现信号 ; 并且当光束投射到记录标记时，只有当来自记录标记的再现光干扰来自非标记部分的再现光时，才在再现信号中产生与第二代码相对应的信息脉冲; 以及信号检测器电路，用于检测从光头获得的再现信号中的信息脉冲，并将再现信号转换成数字再现信号。

公开(公告)号：US4954903A

公开(公告)日：1990-09-04

申请号：US245771

申请日：1988-09-19

申请人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

发明人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

IPC分类号： G11B20/10

CPC分类号： G11B20/10009

摘要： A digital signal reproduction apparatus includes a first differential circuit for differentiating a reproduction signal reproduced from a recording medium. This differential circuit outputs a first order differential signal and second differential circuit differentiates the first order differential signal of the reproduction signal and outputs a second order differential signal. A comparator compares the second order differential signal with a predetermined level to produce a window signal. A peak detecting circuit detects zero-cross points in the first order differential signal and outputs a peak detecting signal. A gate gates the peak detecting signal with the window signal to output a reproduction data signal.

公开(公告)号：US4906874A

公开(公告)日：1990-03-06

申请号：US299001

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B7/125 ,  G11B7/13 ,  G11B11/105 ,  G11B19/04 ,  G11B20/24

CPC分类号： G11B7/126 ,  G11B11/10502 ,  G11B11/10595 ,  G11B19/04 ,  G11B7/00 ,  G11B7/004 ,  G11B7/13

摘要： An analog signal switching device for use in an optical memory device having a recording/erasing mode and a mode other than the recording/erasing mode is disclosed. The switching device includes a source for producing a switch control signal which is HIGH during the recording/erasing mode and LOW during the mode other than the recording/erasing mode. An analog switch is provided for receiving a direct input analog signal and a held input signal and for providing as output the direct input signal during the LOW state of the switch control signal, and the held input signal during the HIGH state of the switch control signal by a switching operation. Further provided is a mask signal generator for generating a mask signal which covers a period during the HIGH state of the switch control signal so as to cover a period during the switching operation of the analog switch, and a gate circuit controlled by the mask signal for allowing the direct input analog signal to pass therethrough during the absence of the mask signal and for preventing the held input signal to pass therethrough during the presence of the mask signal. Thus, noise signals produced by the switching operation of the analog switch are eliminated.

公开(公告)号：US5166838A

公开(公告)日：1992-11-24

申请号：US498710

申请日：1990-03-26

申请人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

发明人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

IPC分类号： G11B20/10

CPC分类号： G11B20/10009

摘要： A digital signal reproduction apparatus includes a first differential circuit for differentiating a reproduction signal reproduced from a recording medium. This differential circuit outputs a first order differential signal. A second differential circuit differentiates the first order differential signal of the reproduction signal and outputs a second order differential signal. A comparator compares the second order differential signal with a predetermined level to produce a window signal. A peak detecting circuit detects zero-cross points in the first order differential signal and outputs a peak detecting signal. A gate gates the peak detecting signal with the window signal to output a reproduction data signal.

摘要翻译： 数字信号再现装置包括用于区分从记录介质再现的再现信号的第一差分电路。 该差分电路输出一阶差分信号。 第二差分电路区分再现信号的一阶差分信号并输出​​二阶微分信号。 比较器将二阶差分信号与预定电平进行比较以产生窗口信号。 峰值检测电路检测一阶差分信号中的零交叉点，并输出峰值检测信号。 门通过窗口信号对峰值检测信号进行门极输出再现数据信号。

公开(公告)号：US5010540A

公开(公告)日：1991-04-23

申请号：US225892

申请日：1988-07-29

申请人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B19/247

CPC分类号： G11B19/247

摘要： An apparatus for recording and reproducing information on and from an optical disk includes a first control for producing a first control signal for controlling the rotational speed of a rotational driving apparatus, on the basis of the detected radial position; a judging apparatus which judges whether or not the reproduced signals are reproduced from a recorded region of the optical disk; a second control for producing a second control signal for controlling the rotational speed of the rotational driving apparatus, on the basis of the signals reproduced from the disk; and a switch apparatus which switches the circuit so that the rotational driving apparatus is controlled by the first control signal when the reproduced signals are not reproduced from a non-recorded region, and controlled by the second control signal when the reproduced signals are reproduced from a recorded region.

公开(公告)号：US4910479A

公开(公告)日：1990-03-20

申请号：US299013

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B19/02 ,  G11B20/10

CPC分类号： G11B20/10027 ,  G11B11/10515 ,  G11B11/10597 ,  G11B19/02 ,  G11B20/10009 ,  G11B7/005

摘要： An automatic gain control device for use in an optical memory device has a circuit for producing an amplification control signal which is fed back to a gain control amplifier through a sample-hold circuit. A pulse train detection circuit is provided for detecting the pulse train indicating that the data stored are a on the optical memory device is being playedback. When the pulse train is detected, the sample-hold circuit is made inactive so that the amplification control signal is directly fed back to the gain control amplifier, and when the pulse train ends, the sample-hold circuit is made active to hold the amplification control signal obtained at the end of the pulse train and to produce the amplification control signal held in the sample-hold circuit.

公开(公告)号：US5361247A

公开(公告)日：1994-11-01

申请号：US581218

申请日：1990-09-11

申请人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Takeshi Yamaguchi

发明人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Takeshi Yamaguchi

IPC分类号： G11B7/005 ,  G11B20/10 ,  G11B20/12 ,  G11B7/00

CPC分类号： G11B7/005 ,  G11B20/10009 ,  G11B20/1217

摘要： An information recording and reproducing device having an automatic gain control device wherein its amplification degree is adjusted according to an AGC voltage varying with an amplitude of a reproduced signal. The automatic gain control device has a holding circuit which holds the AGC voltage in each of recording and erasing operations, and also holds the AGC voltage in reproducing an un-recorded area of information. The AGC voltage is also used for determining an optimum recording condition for a recording medium. Instead of the holding circuit, by installing a limiter circuit for limiting an amplitude of a reproduced signal, and by the use of transient response of the reproduced signal due to an coupling situated before the limiter circuit, an appropriate amplification degree can also be obtained in the automatic gain control device. Further, the limiter circuit which is disposed at a stage before a reproduction circuit and also before a capacitor having the ac coupling, may restrain influence of the transient response of the ac coupling given on the reproduced signal, thereby making it possible to reproduce a signal with small amplitude immediately after recording or erasing operation.

摘要翻译： 一种具有自动增益控制装置的信息记录和再现装置，其中根据以再现信号的幅度变化的AGC电压来调节其放大度。 自动增益控制装置具有在每次记录和擦除操作中保持AGC电压的保持电路，并且还保持AGC电压再现未记录的信息区域。 AGC电压也用于确定记录介质的最佳记录条件。 代替保持电路，通过安装用于限制再现信号的幅度的限制电路，并且由于由于位于限幅器电路之前的耦合而使用再现信号的瞬态响应，也可以获得适当的放大度 自动增益控制装置。 此外，设置在再现电路之前的阶段以及具有交流耦合的电容器之前的限幅器电路可以抑制对再现信号给出的交流耦合的瞬态响应的影响，从而可以再现信号 在记录或擦除操作后立即具有小幅度。

公开(公告)号：US4958337A

公开(公告)日：1990-09-18

申请号：US344530

申请日：1989-04-28

申请人： Toshihiro Yamanaka ,  Nobuyuki Horie ,  Shozou Kobayashi ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shigemi Maeda ,  Yoshiki Nishioka ,  Teruki Sugiura

发明人： Toshihiro Yamanaka ,  Nobuyuki Horie ,  Shozou Kobayashi ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shigemi Maeda ,  Yoshiki Nishioka ,  Teruki Sugiura

IPC分类号： G11B5/016 ,  G11B20/18

CPC分类号： G11B20/1816 ,  G11B5/016

摘要： A disk recording checking method in which recording is performed on a disk having radially different recording tracks each divided circumferentially into a plurality of sectors. The method employs a continuous writing device for continuously writing data onto a predetermined number of the sectors, and a continuous checking device for checking the data, while continuously reading the data from the predetermined number of the sectors. The method utilized checks both the number of errors in each code sequence and the total number of errors in each sector to determine if the data in the sector is valid.

摘要翻译： 一种磁盘记录检查方法，其中在具有径向不同的记录磁道的磁盘上执行记录，每个记录磁道分别沿周向分成多个扇区。 该方法采用连续写入装置，用于将数据连续地写入预定数量的扇区;以及连续检查装置，用于在从预定数量的扇区连续读取数据的同时检查数据。 所使用的方法检查每个代码序列中的错误数量和每个扇区中的错误总数，以确定扇区中的数据是否有效。