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    • 132. 发明授权
    • Apparatus for and method of setting accurate recording time point
    • 设置准确记录时间点的设备和方法
    • US06324136B1
    • 2001-11-27
    • US09270863
    • 1999-03-17
    • Masayoshi YoshidaYoshitaka Shimoda
    • Masayoshi YoshidaYoshitaka Shimoda
    • G11B700
    • G11B27/3027G11B7/00375G11B7/0045G11B7/00718G11B27/24G11B2220/218G11B2220/2562
    • A recording time point setting method and apparatus are provided. The recording time point setting method is a method of setting a recording time point for recording an information piece into one of a plurality of predetermined areas on a recording medium on the basis of a plurality of marks. The marks are pre-recorded on the recording medium at predetermined intervals. The locations of the marks correspond to the locations of the predetermined areas, respectively. The locations of the predetermined areas are predetermined on the basis of a time length of the information piece. In this method, firstly, at least one of the marks is detected. Then, an expectation signal is generated on the basis of the time length of the information piece, and then, a time point at which an output of the expectation signal is started is synchronized with a time point at which the at least one of the marks is detected. The expectation signal is a signal for determining an expectation time point that one of the marks, except for the at least one of the marks already detected, is to be detected. Next, the expectation time point determined by the expectation signal is set as the recording time point.
    • 提供记录时间点设定方法和装置。 记录时间点设定方法是根据多个标记将记录信息片的记录时间点设定在记录介质上的多个预定区域之一的方法。 标记以预定间隔预先记录在记录介质上。 标记的位置分别对应于预定区域的位置。 基于信息片的时间长度来预先确定预定区域的位置。 在该方法中,首先,检测到至少一个标记。 然后,基于信息片的时间长度生成期望信号,然后,期望信号的输出开始的时间点与至少一个标记的时间点同步 被检测到。 期望信号是用于确定期望时间点的信号,除了检测到的已经检测到的至少一个标记之外,其中一个标记被检测。 接下来,由期望信号确定的期望时间点被设定为记录时间点。
    • 135. 发明授权
    • Pre-pit detection unit
    • 预坑检测单元
    • US06603726B1
    • 2003-08-05
    • US09557308
    • 2000-04-25
    • Masayoshi YoshidaYoshitaka Shimoda
    • Masayoshi YoshidaYoshitaka Shimoda
    • G11B700
    • G11B20/10009G11B7/0053G11B7/131G11B20/10027
    • A pre-pit detection unit having pre-pit detection circuits (600 and 700) respectively corresponding to beam intensity in mark and space periods that are provided in parallel on the output side of a push-pull circuit (500) for generating a pre-data signal. The pre-pit detection unit finally outputs the OR of the outputs of both pre-pit detection circuits as a pre-pit detection signal (l). An AGC circuit (601 and 701) for making the maximum amplitude of a radial push-pull signal (d) obtainable from said push-pull circuit coincide with a reference value is provided in the preceding stages of pre-pit detecting comparators (606 and 706) in the respective pre-pit detection circuits.
    • 一种预凹坑检测单元,具有分别对应于在推挽电路(500)的输出侧并联设置的标记和空间周期中的光束强度的预凹坑检测电路(600和700) 数据信号。 预坑检测单元最终将两个预坑检测电路的输出的OR作为预凹坑检测信号(l)输出。 在前置凹坑检测比较器(606和6)中提供用于使可从所述推挽电路获得的径向推挽信号(d)的最大幅度与参考值一致的AGC电路(601和701) 706)。
    • 137. 发明授权
    • Optical disk type identification system using a frequency detector
    • 使用频率检测器的光盘类型识别系统
    • US5764610A
    • 1998-06-09
    • US784383
    • 1997-01-17
    • Masayoshi YoshidaNaoharu Yanagawa
    • Masayoshi YoshidaNaoharu Yanagawa
    • G11B7/00G11B7/004G11B19/12G11B19/28G11B23/36G11B3/90
    • G11B19/12G11B23/36
    • A disc type identifying system for efficiently identifying one optical disc type from others having different recording formats, though having the same size and shape, is provided. The disc type identifying system comprises driver for rotating a disc to be identified a predetermined number of rotations; frequency detector for detecting frequency of a playback signal from the disc to be identified; and identifier for identifying the disc type based on the frequency of the playback signal detected when the disc to be identified is rotated the predetermined number of rotations. The predetermined number of rotations is set at the lowest linear speed among linear speeds defined in the different recording formats. Because the disc type may be identified in the process of a startup operation of a combination unit by constructing as described above, the startup time may be shortened, thus enhancing the efficiency of the system.
    • 提供了具有相同尺寸和形状的用于从具有不同记录格式的其他光盘类型有效地识别一种光盘类型的光盘类型识别系统。 盘型识别系统包括用于旋转盘以便识别预定转数的驱动器; 频率检测器,用于检测来自要识别的盘的重放信号的频率; 以及用于基于当要识别的盘旋转预定转数时检测到的重放信号的频率来识别光盘类型的标识符。 在不同记录格式中定义的线速度之间,将预定转数设定在最低线速度。 因为通过如上所述构造,可以在组合单元的启动操作的过程中识别光盘类型,所以可以缩短启动时间,从而提高系统的效率。