公开(公告)号：US5548570A

公开(公告)日：1996-08-20

申请号：US547313

申请日：1995-10-24

申请人： Hiroshige Hirajima ,  Takeshi Yamaguchi ,  Hiroshi Fuji

发明人： Hiroshige Hirajima ,  Takeshi Yamaguchi ,  Hiroshi Fuji

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14 ,  G11B27/30 ,  H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/04 ,  H04L25/03 ,  H04L25/06

CPC分类号： G11B20/10212 ,  G11B20/1403 ,  G11B27/3027

摘要： An information reproducing circuit for reproducing digital information from a signal read by scanning an optical disk comprises an HPF 1 inputting the read signal and removing a low-frequency component from the input signal for outputting the same, an adder 2 inputting the signal outputted from the HPF 1 and adding a feedback signal having an amplitude matching with half that of the input signal to the input signal for outputting the same, a comparator 3 inputting the signal outputted from the adder 2 and converting the input signal to a binarized signal through a threshold value signal for outputting the binarized signal, a compensation circuit 5 inputting the binarized signal outputted from the comparator 3 and outputting the input signal while compensating the same through a compensation signal for compensating the low-frequency component of the read signal, and an LPF 6 inputting the signal outputted from the circuit 5 and removing a high-frequency component from the input signal for supplying the same to the adder 2 as the feedback signal.

摘要翻译： 用于从通过扫描光盘读取的信号再现数字信息的信息再现电路包括输入读取信号的HPF 1和从输入信号中输出低频分量，输入从 HPF 1，并将具有与输入信号的一半幅度匹配的幅度匹配的反馈信号输入到输出信号以输出;比较器3，输入从加法器2输出的信号，并通过阈值将输入信号转换为二值化信号 输出二值化信号的值信号;补偿电路5，输入从比较器3输出的二值化信号，并通过用于补偿读出信号的低频分量的补偿信号补偿该输入信号并输出​​该输入信号;以及LPF6 输入从电路5输出的信号并从输入信号f去除高频分量 或将其提供给加法器2作为反馈信号。

公开(公告)号：US5675569A

公开(公告)日：1997-10-07

申请号：US567429

申请日：1995-12-05

申请人： Takeshi Yamaguchi ,  Tsuneo Fujiwara ,  Hiroshige Hirajima

发明人： Takeshi Yamaguchi ,  Tsuneo Fujiwara ,  Hiroshige Hirajima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  G11B20/22

CPC分类号： G11B20/10101 ,  G11B20/10009 ,  G11B20/22 ,  G11B11/10515 ,  G11B7/005

摘要： A recorded signal reproduction circuit in an optical disc information reading and recording apparatus converts a recorded signal recovered from an optical disc to PR (1, 2, 1) characteristics through a equalizer circuit, digitizes it through an A/D converter and at the same time also generates a clock signal synchronized in phase with the equalizer circuit output signal by using a binary edcoder circuit and a PLL circuit. This clock signal is then provided to an A/D converter as the sampling clock. The A/D converter output signal is then decoded to the original channel bit stream based on the clock signal. Because the equalizer circuit output signal is provided to both the binary encoder/PLL circuit and the A/D converter together, additional circuity for converting signals into a binary series of pulses is unnecessary and reduction of circuit scale is possible. Moreover, in case of a change-over in the frequency characteristics of the equalizer circuit, due to a change in recording and reproduction frequency, the change-over will not affect the phase relationship between an input signal to the A/D converter and a sampling clock. In addition, it becomes simple to adjust this phase relation.

摘要翻译： 光盘信息读取和记录装置中的记录信号再现电路通过均衡器电路将从光盘恢复的记录信号转换为PR（1,2,1）特性，通过A / D转换器将其数字化 时间还通过使用二进制编码器电路和PLL电路产生与均衡器电路输出信号同相的时钟信号。 该时钟信号随后作为采样时钟提供给A / D转换器。 然后，A / D转换器输出信号基于时钟信号被解码为原始通道位流。 由于均衡器电路输出信号同时提供给二进制编码器/ PLL电路和A / D转换器，所以用于将信号转换成二进制脉冲串的附加电路是不必要的，并且可以减小电路规模。 此外，在均衡器电路的频率特性的转换的情况下，由于记录和再现频率的变化，转换不会影响到A / D转换器的输入信号与A / D转换器之间的相位关系 采样时钟。 此外，调整该相位关系变得简单。

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：US5134607A

公开(公告)日：1992-07-28

申请号：US564799

申请日：1990-08-09

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

IPC分类号： G11B7/004 ,  G11B11/105 ,  G11B27/30

CPC分类号： G11B11/10504 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10597 ,  G11B27/30 ,  G11B7/004

摘要： An optical memory device for recording, reproducing, or erasing information applies an optical beam such as a laser beam onto a recording medium. The optical memory device includes a recorded region detecting circuit for detecting information recorded region formed in the recording medium. In the optical memory device, a timing control for recording, reproducing, or erasing is performed with the use of a result obtained through detection of a synchronizing signal, such as a sector mark, indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit includes either at least one peak hold circuit for detecting a peak level of the playback signal or a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

摘要翻译： 用于记录，再现或擦除信息的光学存储器件将诸如激光束的光束应用到记录介质上。 光学存储器件包括用于检测在记录介质中形成的信息记录区域的记录区域检测电路。 在光学存储器件中，通过使用通过检测指示信息块的起点的同步信号（例如扇区标记）和另一结果而获得的结果来执行用于记录，再现或擦除的定时控制 通过在记录区域检测电路中的检测获得。 记录区域检测电路包括用于检测重放信号的峰值电平的至少一个峰值保持电路或用于平滑重放信号的低通滤波器，以及比较器，用于比较通过峰值保持电路获得的输出或通过低电平 带有参考电压的滤波器。

公开(公告)号：US4924447A

公开(公告)日：1990-05-08

申请号：US12087

申请日：1987-02-06

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

IPC分类号： G11B7/004 ,  G11B11/105 ,  G11B27/30

CPC分类号： G11B11/10504 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10597 ,  G11B27/30 ,  G11B7/004

摘要： An optical memory device for recording, reproducing or erasing information by applying an optical beam such as a laser beam onto a recording medium in which the optical memory device includes a recorded region detecting circuit for detecting information recorded in a specified region formed in the recording medium. The optical memory device also includes a timing control for recording, reproducing or erasing data with the use of one result obtained through detection of a synchronizing signal such as a sector mark indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit contains either of at least one peak hold circuit for detecting a peak level of the playback signal and a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

摘要翻译： 一种用于通过将诸如激光束的光束施加到记录介质上来记录，再现或擦除信息的光学存储器件，其中光学存储器件包括用于检测记录在记录介质中形成的指定区域中的信息的记录区域检测电路 。 光学存储装置还包括一个定时控制，用于通过使用通过检测同步信号获得的一个结果来记录，再现或擦除数据，所述同步信号例如是指示信息块起始点的扇区标记，以及通过检测获得的另一结果 记录区域检测电路。 记录区域检测电路包括用于检测重放信号的峰值电平的至少一个峰值保持电路和用于平滑重放信号的低通滤波器，以及用于比较通过峰值保持电路获得的输出或通过 具有参考电压的低通滤波器。

公开(公告)号：US5553043A

公开(公告)日：1996-09-03

申请号：US358073

申请日：1994-12-15

申请人： Takeshi Yamaguchi ,  Hiroshi Fuji ,  Hiroshige Hirashima ,  Shigeo Terashima

发明人： Takeshi Yamaguchi ,  Hiroshi Fuji ,  Hiroshige Hirashima ,  Shigeo Terashima

IPC分类号： G11B20/14 ,  G11B27/30 ,  G11B7/00

CPC分类号： G11B20/1403 ,  G11B27/3027

摘要： In an information regenerating apparatus, recorded data constructed of a sector mark and a following header section having a plurality of data sets each having a pull-in pattern, an address mark and address information, is read out to form a regenerative signal which in turn is used to regenerate information. A phase-locked loop circuit in a signal synchronizing circuit, performs phase-synchronization with a regenerative signal at two different pull-in speeds. A speed indicating circuit, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of the sector mark as a reference point, instructs the phase-locked loop circuit to set up a fast response speed every time the pull-in pattern appears on the regenerative signal, and instructs the phase-locked loop circuit to set up a slow response speed every time the pull-in pattern disappears from the regenerative signal.

摘要翻译： 在信息再现装置中，读出由扇区标记和具有多个数据组构成的记录数据，每个数据组具有拉入模式，地址标记和地址信息，从而形成再生信号， 用于重新生成信息。 信号同步电路中的锁相环电路以两种不同的拉入速度执行与再生信号的相位同步。 速度指示电路基于从表示扇区标记的检测作为参考点的扇区标记检测信号的生成时间起的基准时钟信号的时钟脉冲数的计数指示锁相环 电路，每当再生信号中出现拉入模式时，建立快速响应速度，并且每当引入模式从再生信号消失时，指示锁相环电路建立缓慢的响应速度。

公开(公告)号：US5377054A

公开(公告)日：1994-12-27

申请号：US86625

申请日：1993-07-02

申请人： Takeshi Yamaguchi ,  Hiroshi Fuji

发明人： Takeshi Yamaguchi ,  Hiroshi Fuji

IPC分类号： G11B20/10 ,  G11B5/09 ,  G11B5/02 ,  H04N5/76

CPC分类号： G11B20/10009

摘要： A digital information reproducing apparatus is arranged to have a first envelope detecting circuit, a second envelope detecting circuit, an operating unit, a comparator, and a switching circuit. The first envelope detecting circuit serves to detect a envelope on the positive side of the output of an equalizing circuit. The second envelope detecting circuit serves to detect a envelope on the negative side of the output of the equalizing circuit. The operating unit serves to produce a difference of the outputs of the envelope detecting circuits. The comparator serves to compare an output of the operating unit with a predetermined signal level. The switching circuit serves to reduce a time constant on which charges stored in a capacitor of each of the envelope detecting circuits are discharged, based on the output signal of this comparator.

摘要翻译： 数字信息再现装置被布置成具有第一包络检测电路，第二包络检测电路，操作单元，比较器和开关电路。 第一包络检测电路用于检测均衡电路的输出的正侧的包络。 第二包络检测电路用于检测均衡电路的输出的负侧的包络。 操作单元用于产生包络检测电路的输出的差。 比较器用于将操作单元的输出与预定信号电平进行比较。 开关电路用于基于该比较器的输出信号来减少存储在每个包络检测电路的电容器中的电荷放电的时间常数。