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    High-speed optical disk drive
    2.
    发明授权
    High-speed optical disk drive 有权
    高速光盘驱动器

    公开(公告)号：US08243573B2

    公开(公告)日：2012-08-14

    申请号：US12362378

    申请日：2009-01-29

    Applicant: Atsushi Kikugawa

    Inventor： Atsushi Kikugawa

    IPC: G11B7/00

    CPC classification number: G11B20/10046 ,  G11B7/126 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/10481 ,  G11B2220/2541

    Abstract: If the read speed is increased while high-frequency modulated carrier is fixed at a constant frequency, it becomes difficult to separate the read signal from the carrier by using bandwidth limitation of the analog system because the upper limit of the read signal band nears to the carrier frequency. Moreover, if the separation between them is eased by raising the carrier frequency, a problem that write-waveform controls become difficult arises. However, the carrier amplitude can be suppressed simultaneously preventing leakage to the read signal band by converting the carrier frequency into the stop-band of the adaptive equalizer by making the use of aliasing that occurs at the A/D conversion.

    Abstract translation: 如果在高频调制载波固定为恒定频率的情况下增加读取速度，则由于读取信号频带的上限接近于模拟系统的上限，因此难以将读取信号与载波分离，因为使用模拟系统的带宽限制 载波频率 此外，如果通过提高载波频率来缓解它们之间的间隔，则会产生写波形控制变得困难的问题。 然而，通过使用在A / D转换时发生的混叠，能够同时抑制载波振幅，从而将载波频率转换成自适应均衡器的阻带，从而可以防止对读取信号频带的泄漏。

    Signal conversion module and optical disc apparatus using the same
    3.
    发明授权
    Signal conversion module and optical disc apparatus using the same 有权
    信号转换模块和使用其的光盘装置

    公开(公告)号：US08045431B2

    公开(公告)日：2011-10-25

    申请号：US12509614

    申请日：2009-07-27

    Applicant: Atsushi Kikugawa

    Inventor： Atsushi Kikugawa

    IPC: G11B7/00

    CPC classification number: G11B7/005 ,  G11B7/1263

    Abstract: In the multi-tone demodulation (MTD) technique, even if an input bandwidth is widened to obtain a larger SNR gain, an increase in the signal to noise ration (SNR) gain cannot always be obtained due to clock jitter that increases clock noise. Also, noise is sometimes superimposed on the clock supplied to an analog to digital converter circuit (ADS) and the noise lowers the performance. Accordingly, the optical disc apparatus loosely regulates the bandwidth of a pulsed read signal; boosts the high-frequency components of a waveform of a driving signal of a laser diode; and synchronizes autonomously a driving clock of the ADC and a digital to analog converter circuit (DAC) with a clock of the pulsed read signal.

    Abstract translation: 在多音调解调（MTD）技术中，即使增加输入带宽以获得较大的SNR增益，由于时钟抖动增加，由于时钟抖动增加，信噪比（SNR）增益不能总是得到提高。 此外，噪声有时叠加在提供给模数转换器电路（ADS）的时钟上，噪声降低了性能。 因此，光盘装置松散地调节脉冲读取信号的带宽; 升高激光二极管的驱动信号的波形的高频分量; 并自动同步ADC的驱动时钟和数模转换器电路（DAC）与脉冲读取信号的时钟。

    Optical disk device and integrated circuit used therein
    4.
    发明授权
    Optical disk device and integrated circuit used therein 有权
    光盘装置及其中使用的集成电路

    公开(公告)号：US07889607B2

    公开(公告)日：2011-02-15

    申请号：US11333284

    申请日：2006-01-18

    Applicant: Atsushi Kikugawa ,  Hiroyuki Minemura

    Inventor： Atsushi Kikugawa ,  Hiroyuki Minemura

    IPC: G11B7/00

    CPC classification number: G11B7/005

    Abstract: This invention involves irradiating an optical disk with laser light, pulse-driven by a high-frequency signal from an HF oscillator, and converting the output of a photo-detector that receives laser light reflected from the optical disk into an electronic pulse readout signal using a current amplifier. The pulse readout signal is converted into a temporally continuous readout signal by a peak hold circuit. The invention solves the problems of SNR deterioration of the readout signal and the difficulty of removing the impact of high-frequency modulation accompanying the increase in the readout speed factor in optical disk devices.

    Abstract translation: 本发明涉及用来自HF振荡器的高频信号脉冲驱动的激光照射光盘，并将接收从光盘反射的激光的光检测器的输出转换为电子脉冲读出信号，该信号使用 一个电流放大器。 脉冲读出信号由峰值保持电路转换成时间连续的读出信号。 本发明解决了伴随着光盘装置读出速度因素的增加而引起的读出信号的信噪比恶化的问题和消除高频调制的冲击的难度。

    HIGH-SPEED OPTICAL DISK DRIVE
    5.
    发明申请
    HIGH-SPEED OPTICAL DISK DRIVE 有权
    高速光盘驱动器

    公开(公告)号：US20090196156A1

    公开(公告)日：2009-08-06

    申请号：US12362378

    申请日：2009-01-29

    Applicant: Atsushi Kikugawa

    Inventor： Atsushi Kikugawa

    IPC: G11B7/00

    CPC classification number: G11B20/10046 ,  G11B7/126 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/10481 ,  G11B2220/2541

    Abstract: If the read speed is increased while high-frequency modulated carrier is fixed at a constant frequency, it becomes difficult to separate the read signal from the carrier by using bandwidth limitation of the analog system because the upper limit of the read signal band nears to the carrier frequency. Moreover, if the separation between them is eased by raising the carrier frequency, a problem that write-waveform controls become difficult arises. However, the carrier amplitude can be suppressed simultaneously preventing leakage to the read signal band by converting the carrier frequency into the stop-band of the adaptive equalizer by making the use of aliasing that occurs at the A/D conversion.

    Abstract translation: 如果在高频调制载波固定为恒定频率的情况下增加读取速度，则由于读取信号频带的上限接近于模拟系统的上限，因此难以将读取信号与载波分离，因为使用模拟系统的带宽限制 载波频率 此外，如果通过提高载波频率来缓解它们之间的间隔，则会产生写波形控制变得困难的问题。 然而，通过使用在A / D转换时发生的混叠，能够同时抑制载波振幅，从而将载波频率转换成自适应均衡器的阻带，从而可以防止对读取信号频带的泄漏。

    OFFSET COMPENSATOR AND OPTICAL DISC DRIVE USING THE SAME
    6.
    发明申请
    OFFSET COMPENSATOR AND OPTICAL DISC DRIVE USING THE SAME 有权
    偏移补偿器和光盘驱动器

    公开(公告)号：US20090135699A1

    公开(公告)日：2009-05-28

    申请号：US12271093

    申请日：2008-11-14

    Applicant: Atsushi KIKUGAWA

    Inventor： Atsushi KIKUGAWA

    IPC: G11B7/0045 ,  G11B27/36

    CPC classification number: G11B20/10009 ,  G11B7/005 ,  G11B20/10037 ,  G11B20/10203 ,  G11B20/10425 ,  G11B20/1403 ,  G11B2007/0013 ,  G11B2020/1457

    Abstract: The generation of a pseudo-lock is prevented in a JFB offset compensator whose use has been conventionally limited due to a tendency to generate the pseudo-lock, and performance degradation of a PLL and a Viterbi decoder is suppressed. A means for monitoring an offset of a read signal is provided independently from the JFB offset compensator. With this configuration, the generation or a possibility of the generation of the pseudo-lock can be detected to reset an integrator. In order to reduce the influence of a large sporadic offset triggering the pseudo-lock, there may also be provided a limitter for limiting the absolute value of an offset signal inputted to the integrator or a limitter for limiting the absolute value of an offset compensation signal.

    Abstract translation: 在由于产生伪锁定的趋势而通常限制其使用的JFB偏移补偿器中，防止了伪锁定的产生，并且抑制了PLL和维特比解码器的性能劣化。 与JFB偏移补偿器独立地提供用于监视读取信号的偏移的装置。 利用这种配置，可以检测生成伪锁定的可能性或重置积分器。 为了减少触发伪锁定的大量零星偏移的影响，还可以提供限制输入到积分器的偏移信号的绝对值或用于限制偏移补偿信号的绝对值的限幅器 。

    Offset compensator and optical disc drive using the same
    9.
    发明授权
    Offset compensator and optical disc drive using the same 有权
    偏移补偿器和使用其的光盘驱动器

    公开(公告)号：US08089845B2

    公开(公告)日：2012-01-03

    申请号：US12271093

    申请日：2008-11-14

    Applicant: Atsushi Kikugawa

    Inventor： Atsushi Kikugawa

    IPC: G11B7/00

    CPC classification number: G11B20/10009 ,  G11B7/005 ,  G11B20/10037 ,  G11B20/10203 ,  G11B20/10425 ,  G11B20/1403 ,  G11B2007/0013 ,  G11B2020/1457

    Abstract: The generation of a pseudo-lock is prevented in a JFB offset compensator whose use has been conventionally limited due to a tendency to generate the pseudo-lock, and performance degradation of a PLL and a Viterbi decoder is suppressed. A means for monitoring an offset of a read signal is provided independently from the JFB offset compensator. With this configuration, the generation or a possibility of the generation of the pseudo-lock can be detected to reset an integrator. In order to reduce the influence of a large sporadic offset triggering the pseudo-lock, there may also be provided a limitter for limiting the absolute value of an offset signal inputted to the integrator or a limitter for limiting the absolute value of an offset compensation signal.

    Abstract translation: 在由于产生伪锁定的趋势而通常限制其使用的JFB偏移补偿器中，防止了伪锁定的产生，并且抑制了PLL和维特比解码器的性能劣化。 与JFB偏移补偿器独立地提供用于监视读取信号的偏移的装置。 利用这种配置，可以检测生成伪锁定的可能性或重置积分器。 为了减少触发伪锁定的大量零星偏移的影响，还可以提供限制输入到积分器的偏移信号的绝对值或用于限制偏移补偿信号的绝对值的限幅器 。

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