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    • 3. 发明授权
    • Recording and reproducing apparatus and recording medium
    • 记录和再现设备和记录介质
    • US08081559B2
    • 2011-12-20
    • US11960439
    • 2007-12-19
    • Masao FujitaKenji TanakaShinji KawakamiSadamu Kuse
    • Masao FujitaKenji TanakaShinji KawakamiSadamu Kuse
    • G11B7/00
    • G11B5/584G11B5/59677
    • The present invention provides a recording and reproducing apparatus that can perform high-precision tracking servo control by removing noise from detected servo signals. The recording and reproducing apparatus performs tracking servo control while reading servo signals 10 that are formed on a surface 9 of a recording medium 2 so as to produce optical contrast, the apparatus including a modulated irradiator 20 for irradiating the servo signals 10 with a light beam, the intensity of the light beam being modulated by a modulating wave that is frequency-modulated; a photoelectric converter 30 for converting reflected light from the servo signals 10 into electric signals; and a synchronous demodulator 15 for subjecting the electrical signal to synchronous demodulation using the modulating wave as a reference wave.
    • 本发明提供了一种通过从检测到的伺服信号中去除噪声来执行高精度跟踪伺服控制的记录和再现装置。 记录和重放装置执行跟踪伺服控制,同时读取形成在记录介质2的表面9上的伺服信号10以便产生光学对比度,该装置包括调制辐射器20,用于用光束照射伺服信号10 光束的强度由被调制的调制波调制; 用于将来自伺服信号10的反射光转换为电信号的光电转换器30; 以及用于使用调制波作为参考波对电信号进行同步解调的同步解调器15。
    • 9. 发明授权
    • Data recording apparatus and data recording method
    • 数据记录装置和数据记录方法
    • US08130463B2
    • 2012-03-06
    • US12128156
    • 2008-05-28
    • Masao FujitaKenji TanakaSadamu Kuse
    • Masao FujitaKenji TanakaSadamu Kuse
    • G11B21/02
    • G11B5/00813G11B5/02G11B5/022G11B2005/0005
    • A data recording apparatus of the present invention includes a head that records data signals by magnetizing a magnetic tape 10 and a recording control portion that controls the recording operation by causing recording current to flow to the head. The recording control portion controls the operation of the head, so that in the magnetic tape 10, which is direct current demagnetized continuously in the longitudinal direction, a magnetic field is formed intermittently in an opposite direction to the magnetization direction of the direct current demagnetization. Thus, when recording data signals on the magnetic recording medium, it is possible to make the current flowing to the head small and to realize apparatus power consumption reductions, load reductions for the head and circuitry, and reduction in crosstalk noise from the head chip used for writing to the head chip used for reading.
    • 本发明的数据记录装置包括通过磁化磁带10记录数据信号的磁头和通过使记录电流流向磁头来控制记录操作的记录控制部分。 记录控制部分控制磁头的操作,使得在沿着纵向方向连续地退磁的磁带10中,在与直流退磁的磁化方向相反的方向间歇地形成磁场。 因此,当在磁记录介质上记录数据信号时,可以使流过头部的电流变小,并实现设备功耗降低,头部和电路的负载降低,以及减少来自头部芯片的串扰噪声 用于写入用于阅读的头部芯片。
    • 10. 发明授权
    • Servo signal recording apparatus, information recording apparatus, and tracking servo method
    • 伺服信号记录装置,信息记录装置和跟踪伺服方法
    • US08068308B2
    • 2011-11-29
    • US12476773
    • 2009-06-02
    • Masao FujitaShinji KawakamiToshio KawakitaSadamu Kuse
    • Masao FujitaShinji KawakamiToshio KawakitaSadamu Kuse
    • G11B5/584G11B21/02
    • G11B5/584
    • In the apparatus and method of the invention, a servo signal reproduction unit generates a PES from a servo signal reproduced from a magnetic tape, and a frequency conversion unit performs FFT processing of the PES to generate frequency component information. Then, a filter value generation unit generates filter values based on the frequency component information and writes these to a memory. When recording various data signals to the magnetic tape, the filter values are read from the memory and a control filter serving as a notch filter is incorporated into a feedback control for a tracking servo. This enables periodic and narrow-band noise to be removed from a PES, consequently reducing PESs. Accordingly, learning-type optimum notch filter control that allows a magnetic head to follow recording tracks at high speed and with high precision is possible even when the recording track width is reduced and the tape speed is increased.
    • 在本发明的装置和方法中,伺服信号再现单元从从磁带再现的伺服信号产生PES,并且频率转换单元执行PES的FFT处理以产生频率分量信息。 然后,滤波器值生成单元基于频率分量信息生成滤波器值,并将其写入存储器。 当将各种数据信号记录到磁带上时,从存储器中读取滤波器值,并且将用作陷波滤波器的控制滤波器并入用于跟踪伺服的反馈控制。 这使得能够从PES去除周期性和窄带噪声,从而减少PES。 因此,即使当记录磁道宽度减小并且磁带速度增加时,也可以使磁头以高速和高精度跟随记录磁道的学习型最佳陷波滤波器控制。