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1. 发明授权

US5325346A Digital servo apparatus for optical disc player 失效
标题翻译：光盘播放器数字伺服装置
公开(公告)号：US5325346A
公开(公告)日：1994-06-28
申请号：US967274
申请日：1992-10-26
申请人： Kiyomasa Hasegawa , Takeshi Sasaki , Hidenobu Noda
发明人： Kiyomasa Hasegawa , Takeshi Sasaki , Hidenobu Noda
IPC分类号： G11B7/085 , G11B21/08 , G11B7/00
CPC分类号： G11B7/08541
摘要： A track traverse detecting circuit for generating a count-out signal with precision in addressing high-speed traverse operations appropriately. The circuit includes a tracking zero cross (TZC) signal generating circuit, two delay circuits, an edge detecting circuit and a mirror signal generating circuit. The TZC signal generating circuit generates a TZC signal at the zero cross timing of a tracking error signal. The TZC signal is then delayed by one of the two delay circuits by an appropriate time in accordance with the traverse speed for access to a desired track. Edges of the delayed TZC signal are detected by the edge detecting circuit. A mirror signal output by the mirror signal generating circuit is sampled at the timing of the detected TZC signal edges. The output of the sampling is provided accurately as the count-out signal.
摘要翻译：一种轨道横移检测电路，用于适当地产生寻址高速横移操作的精度的计数输出信号。电路包括跟踪零交叉（TZC）信号发生电路，两个延迟电路，边缘检测电路和镜像信号发生电路。 TZC信号发生电路在跟踪误差信号的零交叉定时产生TZC信号。然后根据用于访问所需轨道的横越速度，将两个延迟电路之一延迟TZC信号适当的时间。延迟TZC信号的边缘由边缘检测电路检测。在检测到的TZC信号边缘的定时对镜面信号发生电路输出的镜像信号进行采样。准确地提供采样的输出作为计数输出信号。

2. 发明授权

US5682307A Circuits and methods for controlling a tracking actuator of an optical disk player 失效
标题翻译：用于控制光盘播放器的跟踪致动器的电路和方法
公开(公告)号：US5682307A
公开(公告)日：1997-10-28
申请号：US460138
申请日：1995-06-02
申请人： Takeshi Sasaki , Hidenobu Noda
发明人： Takeshi Sasaki , Hidenobu Noda
IPC分类号： G11B7/085 , G11B7/09 , G11B7/00
CPC分类号： G11B7/0946 , G11B7/0948 , G11B7/08529 , G11B7/08541 , G11B7/0941
摘要： A digital servo circuit for an optical disk player having a tracking actuator utilizes a digital filter for alternately extracting from a tracking error signal a frequency component within a specified band and a high-frequency component. In response to the high-frequency component, a braking force is applied to the tracking actuator when a brake ON command is issued. Coefficient values in the digital filter are set up depending on whether the brake ON command is issued.
摘要翻译：具有跟踪致动器的光盘播放器的数字伺服电路利用数字滤波器，从跟踪误差信号中交替提取特定频带内的频率分量和高频分量。响应于高频分量，当发出制动ON命令时，向跟踪致动器施加制动力。数字滤波器的系数值根据是否发出制动ON指令而设置。

3. 发明授权

US5623465A Optical disk player with a digital servo-control circuit incorporating a time sharing multifunctional digital filter 失效
标题翻译：具有数字伺服控制电路的光盘播放器，并入时分多功能数字滤波器
公开(公告)号：US5623465A
公开(公告)日：1997-04-22
申请号：US257473
申请日：1994-06-09
申请人： Takeshi Sasaki , Hidenobu Noda
发明人： Takeshi Sasaki , Hidenobu Noda
IPC分类号： G11B7/085 , G11B7/09 , G11B7/095
CPC分类号： G11B7/0946 , G11B7/0948 , G11B7/08529 , G11B7/08541 , G11B7/0941
摘要： An optical disk player provided with a digital servo circuit uses a time-sharing multifunctional digital filter, in which a plurality of filter functions are realized with a single filter. By lowering the sampling frequency of the plurality of digital filter functions than the master clock of the signal processing circuit and operating the plurality of digital filters on a time-sharing basis, the number of steps of the signal processing command can be decreased and the circuit scale can be reduced. By constructing a High Pass Tracking Zero Cross HPF and an anti-shock BPF of a digital filter using the same step, reduction in the circuit scale and increase in the sampling rate can be attained.
摘要翻译：具有数字伺服电路的光盘播放器使用分时多功能数字滤波器，其中通过单个滤波器实现多个滤波器功能。通过降低多个数字滤波器功能的采样频率而不是信号处理电路的主时钟，并且在分时基础上操作多个数字滤波器，可以减少信号处理命令的步数，并且电路规模可以减少。通过使用相同的步骤构建数字滤波器的高通跟踪零交叉HPF和抗冲击BPF，可以实现电路规模的缩小和采样率的提高。

4. 发明授权

US5703849A Tracking servo correction control circuit 失效
标题翻译：跟踪伺服校正控制电路
公开(公告)号：US5703849A
公开(公告)日：1997-12-30
申请号：US634767
申请日：1996-04-19
申请人： Hidenobu Noda
发明人： Hidenobu Noda
IPC分类号： G11B7/09 , G11B7/095
CPC分类号： G11B7/094 , G11B7/0948 , G11B7/0903
摘要： In a tracking servo circuit for such as an optical disc device, and the like, a tracking error signal TE obtained in a servo-off state is subjected to A/D conversion, the center level thereof is calculated at a center level computation circuit, that value is stored in a register, at a time of servo-on, switches are connected to one terminal side, in the normal operation mode, the center level stored in the register is subtracted from the tracking error signal TE obtained at the time of the servo-on state at the subtraction circuit, the offset of the tracking error signal is corrected, and when light reflected from the surface of the disc can no longer be obtained due to an accidental cause, the connection of another switch is switched to the terminal b in response to the switching of the signal FOK generated based on the RF signal to the low level, and the offset correction operation of the tracking error signal TE is stopped.
摘要翻译：在诸如光盘装置等的跟踪伺服电路中，在伺服关闭状态下获得的跟踪误差信号TE进行A / D转换，其中心电平在中心电平计算电路中计算，该值被存储在寄存器中，在伺服开启时，开关连接到一个端子侧，在正常操作模式下，从存储在寄存器中的中心电平减去从在在减法电路处的伺服打开状态，跟踪误差信号的偏移被校正，并且当由于意外原因而不能再获得从盘表面反射的光时，另一个开关的连接被切换到端子b响应于基于RF信号产生的信号FOK的切换为低电平，并且停止跟踪误差信号TE的偏移校正操作。

5. 发明授权

US5796685A Digital servo circuit generating mirror detecting signal 失效
标题翻译：数字伺服电路产生镜像检测信号
公开(公告)号：US5796685A
公开(公告)日：1998-08-18
申请号：US631965
申请日：1996-04-15
申请人： Hidenobu Noda , Yasuyuki Suda
发明人： Hidenobu Noda , Yasuyuki Suda
IPC分类号： G11B7/005 , G11B7/085 , G11B7/095
CPC分类号： G11B7/08541
摘要： A digital servo circuit generating a digital RF signal in accordance with the intensity of a reflected light of light irradiated to a surface of a recording medium by an optical pickup and generating a mirror-surface detection signal based on a peak level and bottom level of the digital RF signal. The circuit includes a peak level counter which performs a comparison between the potential of the digital RF signal and a first potential held in advance and, when the potential of the digital RF signal is larger than the first potential, holds the potential of the digital RF signal as the first potential and, when otherwise, performs a down count at a speed in accordance with an enable signal; a bottom level counter which performs a comparison between the potential of the digital RF signal and a second potential held in advance and, when the potential of the digital RF signal is larger than the second potential, holds the potential of the digital RF signal as the second potential and, when otherwise, performs an up count at a speed in accordance with an enable signal; and a count speed selection circuit which selects the speed of the count in accordance with the speed of movement of the irradiated spot of light irradiated to the surface of the recording medium and supplies the same as the enable signal to the bottom level counter or the peak level counter.
摘要翻译：一种数字伺服电路，其根据由光学拾取器照射到记录介质的表面的光的反射光的强度产生数字RF信号，并且基于所述光学拾取器的峰值电平和底部电平产生镜面检测信号数字射频信号。该电路包括峰值电平计数器，其执行数字RF信号的电位与预先保持的第一电位之间的比较，并且当数字RF信号的电位大于第一电位时，保持数字RF的电位信号作为第一电位，否则，根据使能信号以速度执行递减计数; 执行数字RF信号的电位与预先保持的第二电位之间的比较的底层计数器，并且当数字RF信号的电位大于第二电位时，将数字RF信号的电位保持为并且当其它情况下，根据使能信号以速度执行向上计数; 以及计数速度选择电路，其根据照射到记录介质的表面的照射光点的移动速度来选择计数速度，并将其作为使能信号提供给底层计数器或峰值级计数器。

6. 发明授权

US5590103A Tracking servo circuit for an optical disc player 失效
标题翻译：跟踪光盘播放器的伺服电路
公开(公告)号：US5590103A
公开(公告)日：1996-12-31
申请号：US384614
申请日：1995-02-03
申请人： Hidenobu Noda
发明人： Hidenobu Noda
IPC分类号： G11B7/085 , G11B7/09 , G11B7/095 , G11B21/10 , G11B7/00
CPC分类号： G11B7/094
摘要： A tracking servo circuit in which a tracking error signal obtained when tracking servo at disc player initialization is off is captured, its center level is calculated, the calculated center level is held in a register 17, and the center level held in the register 17 is subtracted from a tracking error signal obtained when the tracking servo is on. Consequently, an offset of the tracking error signal caused by a sensitivity imbalance between tracking servo photodiodes due to their aging or the like is detected to be securely corrected, thereby enhancing playability of a disc player in which the tracking servo circuit according to the invention is used.
摘要翻译：捕获在光盘播放机初始化时跟踪伺服时获得的跟踪误差信号为关的跟踪伺服电路，计算其中心电平，将计算出的中心电平保持在寄存器17中，并且保持在寄存器17中的中心电平为从跟踪伺服打开时获得的跟踪误差信号中减去。因此，检测由于其老化等引起的跟踪伺服光电二极管之间的灵敏度不平衡引起的跟踪误差信号的偏移，从而提高根据本发明的跟踪伺服电路的盘播放机的可播放性用过的。

7. 发明授权

US5475664A Focus servo circuit apparatus with automatic bias adjustments 失效
标题翻译：聚焦伺服电路设备，具有自动偏置调整功能
公开(公告)号：US5475664A
公开(公告)日：1995-12-12
申请号：US410863
申请日：1995-03-16
申请人： Kazutoshi Shimizume , Mamoru Akita , Shigeru Inohana , Hidenobu Noda
发明人： Kazutoshi Shimizume , Mamoru Akita , Shigeru Inohana , Hidenobu Noda
IPC分类号： G11B7/095 , G11B7/09
CPC分类号： G11B7/094
摘要： In a recording and reproducing apparatus of CD or the like, it is adapted such that the time difference between an edge of a PLL clock synchronized with an EFM signal and a transition point of the EFM signal is measured in a time difference measuring circuit, a focus bias voltage to bring the time difference to a minimum is established in a bias voltage generator, the established focus bias voltage is added in an adder to a focus error signal generated in a focus error signal generator, and, thereby, the focus bias is automatically adjusted and focus servo is executed in accordance with the bias-adjusted focus error signal.
摘要翻译：在CD等的记录和再现装置中，适于使得在时差测量电路中测量与EFM信号同步的PLL时钟的边缘与EFM信号的转变点之间的时间差，在偏置电压发生器中建立聚焦偏置电压以使时间差达到最小值，将所建立的聚焦偏置电压加到加法器中，使其在聚焦误差信号发生器中产生的聚焦误差信号，从而聚焦偏置根据偏置调整的聚焦误差信号执行自动调节和聚焦伺服。

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