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    • 74. 发明授权
    • Optical disk reproducing apparatus
    • 光盘重放装置
    • US5598396A
    • 1997-01-28
    • US599821
    • 1996-02-12
    • Ryusuke HoribeMasaharu ImuraToshiyuki Shimada
    • Ryusuke HoribeMasaharu ImuraToshiyuki Shimada
    • G11B20/14G11B7/00
    • G11B20/1403
    • The optical disk reproducing apparatus of the invention includes: a waveform equalizing section for emphasizing a predetermined range of frequency band of a reproduced signal; a digitizing section for digitizing the reproduced signal which has been emphasized by the wave equalizing section at a predetermined level, so as to convert the emphasized reproduced signal into a digital signal; a period detecting section for detecting and outputting a period of a predetermined pattern included in the digital signal; a phase lock loop section having a free-run period, for controlling the free-run period based on the output of the period detecting section so that the free-run period becomes substantially equal to a period of a clock component of the digital signal, and for outputting a reproduced clock signal by reproducing the clock component of the digital signal; and a synchronizing section for synchronizing the digital signal with the reproduced clock signal so as to output a synchronized signal as reproduced data.
    • 本发明的光盘再现装置包括:波形均衡部分,用于强调再现信号的预定频带范围; 数字化部分,用于将由波均衡部分强调的再现信号数字化为预定电平,以将强调的再现信号转换为数字信号; 周期检测部分,用于检测和输出包括在数字信号中的预定模式的周期; 具有自由运行周期的锁相环部分,用于基于周期检测部分的输出来控制自由运行周期,使得自由运行周期变得基本上等于数字信号的时钟分量的周期, 并且通过再现数字信号的时钟分量来输出再现的时钟信号; 以及同步部分,用于使数字信号与再现的时钟信号同步,以便输出同步信号作为再现数据。
    • 77. 发明授权
    • Signal processing device and signal processing method
    • 信号处理装置及信号处理方法
    • US07215631B2
    • 2007-05-08
    • US10510988
    • 2003-12-25
    • Ryusuke HoribeKazutoshi Aida
    • Ryusuke HoribeKazutoshi Aida
    • G11B7/00
    • G11B20/10009G11B2020/1863
    • A feedback loop structure including an operational amplifier unit (1) for amplifying a reproduction signal of recorded information and a gain/offset control unit (6) for controlling an amplitude and an offset of an output of the operational amplifier unit (1) so that each of the amplitude and the offset becomes a predetermined value is adopted, and accurate information for an asymmetry amount is obtained by a binarization unit (7) for receiving the output of the operational amplifier unit (1) and performing binarization while adjusting a slice level by feedback control so that a duty ratio after the binarization substantially becomes a predetermined value. Based on the asymmetry amount information, a judgment level of a Viterbi decoding unit (15) is changed, thereby reducing a reproduction error rate.
    • 一种反馈环结构,包括用于放大记录信息的再现信号的运算放大器单元(1)和用于控制运算放大器单元(1)的输出的幅度和偏移的增益/偏移控制单元(6),使得 采用幅度和偏移中的每一个变为预定值,并且通过用于接收运算放大器单元(1)的输出的二值化单元(7)获得用于不对称量的精确信息,并且在调整限幅电平的同时执行二值化 通过反馈控制使得二值化之后的占空比基本上变为预定值。 基于不对称量信息,维特比解码单元(15)的判断电平改变,从而降低再现错误率。
    • 78. 发明授权
    • Optical disk device
    • 光盘装置
    • US5777967A
    • 1998-07-07
    • US628298
    • 1996-04-05
    • Hiromichi IshibashiToshiyuki ShimadaYasuaki EdahiroMitsurou MoriyaRyusuke HoribeHiroyuki Miyachi
    • Hiromichi IshibashiToshiyuki ShimadaYasuaki EdahiroMitsurou MoriyaRyusuke HoribeHiroyuki Miyachi
    • G11B7/0037G11B7/005G11B20/10G11B27/36G11B7/00
    • G11B20/10009G11B27/36G11B7/00375G11B7/005
    • A phase error between an information signal including a reference signal that can be detected asynchronously and a synchronized signal that is synchronously produced from the information signal is detected, and a signal in response to an absolute value of the phase error is produced. Further, a defect detecting signal is produced in response to the absolute value of the phase error. Therefore, whether a pulse signal exceeding a maximum value of the pulse width of the information signal, that is, a pulse signal exceeding the pulse width of the reference signal, is detected or not, it is possible to detect that the signal reproduction enters a defect region immediately after the entry. Accordingly, a defect with noise or a track jumping can be detected rapidly. Furthermore, an information transition interval of the information signal is measured for a prescribed period of time, and the defect detecting signal is terminated in response to a measured value of a time length of the reference signal that is detected in the prescribed period of time, in other words, the passing of the signal reproduction through the defect region is detected with reference to the synchronization of the reference signal. Therefore, pseudo locking of a PLL is avoided when it is operated again, and the PLL can be accurately re-locked.
    • 检测包括可以异步检测的参考信号的信息信号与从信息信号同步产生的同步信号之间的相位误差,并且产生响应于相位误差的绝对值的信号。 此外,响应于相位误差的绝对值产生缺陷检测信号。 因此,检测到是否检测到超过信息信号的脉冲宽度的最大值的脉冲信号,即超过参考信号的脉冲宽度的脉冲信号,则可以检测到信号再现进入 缺陷区域。 因此,可以快速地检测到具有噪声或轨迹跳跃的缺陷。 此外,信息信号的信息转换间隔在规定时间内被测量,并且响应于在规定时间段内检测到的参考信号的时间长度的测量值而终止缺陷检测信号, 换句话说,参考参考信号的同步来检测通过缺陷区域的信号再现的通过。 因此,当再次操作PLL时,可以避免PLL的伪锁定,并且可以准确地重新锁定PLL。
    • 80. 发明授权
    • Signal processing apparatus and signal processing method
    • 信号处理装置及信号处理方法
    • US07215632B2
    • 2007-05-08
    • US10479275
    • 2003-03-11
    • Ryusuke Horibe
    • Ryusuke Horibe
    • G11B7/00
    • G11B20/10009G11B7/005G11B7/0945G11B7/0948
    • An optical disc system comprises a gain offset unit for giving a gain and an offset to an inputted reproduction signal, an A/D converter, a peak detector, a bottom detector, an amplitude detector for calculating a signal, an offset detector for calculating a signal offset, a dropout detector for detecting a dropout in the input signal, and a controller for performing gain control and offset control of the gain offset unit, the controller being able to hold the control operation or switch the control speed by a hold signal that is supplied from the outside, wherein a defect in a recording medium is detected to hold the gain control and offset control or change the control response speed, whereby the signal amplitude and offset at the input of the A/D converter are always kept constant.
    • 光盘系统包括用于给输入的再现信号增益和偏移的增益偏移单元,A / D转换器,峰值检测器,底部检测器,用于计算信号的振幅检测器,用于计算信号的偏移检测器 信号偏移,用于检测输入信号中的压差的压差检测器,以及用于执行增益偏移单元的增益控制和偏移控制的控制器,所述控制器能够保持控制操作或将控制速度切换为保持信号, 从外部提供,其中检测到记录介质中的缺陷以保持增益控制和偏移控制或改变控制响应速度,由此A / D转换器的输入处的信号幅度和偏移总是保持恒定。