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    • 46. 发明授权
    • Method for calibrating circuit network measurement devices
    • 校准电路网络测量设备的方法
    • US5646536A
    • 1997-07-08
    • US504181
    • 1995-07-19
    • Atsushi Ishihara
    • Atsushi Ishihara
    • G01R27/28G01R27/32G01R35/00G01R27/00
    • G01R35/005G01R27/32
    • The purpose of a through calibration is to correct errors in transmission coefficients in both the forward and reverse directions between two measurement ports of a circuit network measurement device having many ports. If there are N measurement ports, error corrections of the transmission coefficients are necessary for all combinations of two measurement ports selected from N ports. The calibration method of this invention is one in which the calibration measurements are performed with n combinations, rather than all combinations, and calibration values for all combinations are obtained by calculation. The n combinations and their measurements may be performed by any combination that satisfies the following conditions: (A) there are triangular combinations of connected ports; (B) all of the other combinations of ports are linked with the triangular combination; and (C) in one combination among the triangular combinations, a measurement of the transmission coefficient in only one direction is sufficient.
    • 通过校准的目的是校正具有许多端口的电路网络测量设备的两个测量端口之间的正向和反向两个传输系数中的误差。 如果存在N个测量端口,则从N个端口中选择的两个测量端口的所有组合都需要传输系数的误差校正。 本发明的校准方法是其中以n种组合而不是所有组合进行校准测量,并且通过计算获得所有组合的校准值。 n组合及其测量可以通过满足以下条件的任意组合来执行:(A)有连接端口的三角形组合; (B)端口的所有其他组合与三角形组合相连; 和(C)在三角形组合之间的一个组合中,仅在一个方向上的透射系数的测量就足够了。
    • 48. 发明授权
    • Optical disk apparatus
    • 光盘装置
    • US4519056A
    • 1985-05-21
    • US473629
    • 1983-03-09
    • Katsumi KimotoAtsushi Ishihara
    • Katsumi KimotoAtsushi Ishihara
    • G11B7/0045G11B19/02G11B19/04G11B21/08G11B27/36G11B7/00H04N5/76
    • G11B19/04G11B19/02G11B21/081G11B27/36G11B7/0045
    • A data recording apparatus is provided which has a recording/reproduction head for recording data on or reproducing the data from a recording medium, a moving mechanism for moving the recording/reproducing head on the recording medium, an error detector for detecting an error in accordance with a signal from the recording/reproduction head in the recording mode, and a control section for detecting that an access to a recording start track cannot be made by the recording/reproduction head for recording data, for determining a track number in the vicinity of the recording start track by the recording/reproduction head in accordance with a detection result, and for controlling a moving mechanism to move the recording/reproduction head to a target track ahead of a predetermined number of tracks which correspond to a distance between the target track and the recording start track without performing recording of data on the predetermined number of tracks in accordance with a detection result from a tracking error detector.
    • 提供了一种数据记录装置,其具有用于在记录介质上记录数据或从记录介质再现数据的记录/再现头,用于在记录介质上移动记录/再现头的移动机构,用于根据记录介质检测错误的检错器 在记录模式下具有来自记录/再现头的信号,以及控制部分,用于检测用于记录数据的记录/再现头不能进行对记录开始轨迹的访问,用于确定记录/再现头附近的轨道号 通过记录/再现头根据检测结果的记录开始轨迹,并且用于控制移动机构将记录/再现头移动到预定数量的轨道之前的目标轨道,该预定轨迹数目对应于目标轨迹 和记录开始轨迹,而不根据检测结果在预定数量的轨道上执行数据的记录 来自跟踪误差检测器。
    • 49. 发明授权
    • Positioning servo circuit for a disk system
    • 定位磁盘系统的伺服电路
    • US4513406A
    • 1985-04-23
    • US373785
    • 1982-04-30
    • Atsushi Ishihara
    • Atsushi Ishihara
    • G11B7/085G11B7/09G11B17/00G11B7/00
    • G11B7/08529G11B17/005G11B7/08505G11B7/0901
    • The invention provides a disc device having a disc with a spiral data recording area, a motor for driving the disc, a head for recording data on the disc, reproducing it therefrom and erasing it thereon, a movable mechanism for radially moving the head on the disc, a positioning servo circuit for controlling and driving the movable mechanism, and a microprocessor for controlling the positioning servo circuit. A counter is included in the positioning servo circuit. The counter counts rotation synchronizing clock signals from the motor and outputs a predetermined reference position signal. In accordance with an output signal from the counter, the movable mechanism is driven at the same velocity as that at which the data recording area of the disc is moved in the movement direction of the movable mechanism.
    • 本发明提供了一种盘装置,其具有带有螺旋数据记录区的盘,用于驱动盘的马达,用于在盘上记录数据的头,从其上再现并擦除在其上的可移动机构, 盘,用于控制和驱动可移动机构的定位伺服电路,以及用于控制定位伺服电路的微处理器。 计数器包含在定位伺服电路中。 计数器对来自电动机的旋转同步时钟信号进行计数,并输出预定的基准位置信号。 根据来自计数器的输出信号,可移动机构以与盘的数据记录区域在可移动机构的移动方向上移动的速度相同的速度被驱动。