公开(公告)号：US5155485A

公开(公告)日：1992-10-13

申请号：US603378

申请日：1990-10-26

申请人： Yoichiro Sako ,  Tamotsu Yamagami

发明人： Yoichiro Sako ,  Tamotsu Yamagami

IPC分类号： H03M7/14 ,  G11B20/14 ,  H03M5/14

CPC分类号： G11B20/1426 ,  H03M5/145

摘要： This invention relates to a code modulating apparatus and a code demodulating apparatus for digital signals such as PCM audio signal, computer data, and so on. An input signal of M bit words is divided into a plurality of data bits and the code conversion is performed for respective data bits, thereby simplifying the circuit arrangement for data conversion.

公开(公告)号：US5148422A

公开(公告)日：1992-09-15

申请号：US570432

申请日：1990-08-21

申请人： Yoichiro Sako ,  Tamotsu Yamagami

发明人： Yoichiro Sako ,  Tamotsu Yamagami

IPC分类号： G11B7/004 ,  G11B7/007 ,  G11B7/09 ,  G11B11/105 ,  G11B20/12 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30

CPC分类号： G11B27/24 ,  G11B20/1251 ,  G11B27/3027 ,  G11B7/004 ,  G11B7/0079 ,  G11B7/0938 ,  G11B11/10578 ,  G11B20/1217 ,  G11B2220/218 ,  G11B2220/2525 ,  G11B2220/2545

摘要： An optical recording medium for storing optically readable data includes at least one preformed recording track of predetermined width and extending in a predetermined recording direction, the recording track having a recordable region extending in the recording direction thereof for recording data containing clock signal components, the recording track being provided with predetermined offset portions extending in the direction of the width thereof representing offset recorded data, the offset portions being formed such that the offset recorded data has a frequency upon scanning the recording track related by an integral ratio with respect to the clock signal components of the data. When principal information signals are recorded on the track of the recording medium, clock signals are produced with the use of the offset recorded data and, when the principal information signals are reproduced from the recording medium, the offset recorded data are used for accessing, so that record and reproduce clocking may be produced from signals wholly apart from the principal information signals recorded in the recording track. In addition, by providing offset portions of the recording tracks, it is possible to record information outside of the recordable region of the recording track. In one embodiment, the phases of clock components of the principal information signals are recorded therewith so that when these signals are reproduced, a phase locked loop produces reproduced clocking signals having a frequency based upon the offset data signals and a phase determined by the signals recorded in the recordable region. This serves to reduce the time required for frequency and phase capturing and eliminates the need to provide a lengthy clock capturing preamble region in the recording track.

公开(公告)号：US4788685A

公开(公告)日：1988-11-29

申请号：US14398

申请日：1987-02-13

申请人： Yoichiro Sako ,  Tamotsu Yamagami ,  Shinichi Yamamura

发明人： Yoichiro Sako ,  Tamotsu Yamagami ,  Shinichi Yamamura

IPC分类号： G06F1/00 ,  G06F12/14 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G06F11/10

CPC分类号： G11B20/1809 ,  G06F12/1408 ,  G11B20/10 ,  G11B20/1254 ,  G11B2020/10546 ,  G11B2020/10888 ,  G11B2220/2525

摘要： A recording and reproducing apparatus comprising a memory for storing input data to be recorded in units of a predetermined quantity, a first address control means for generating only sequential memory addresses, a second address control means for generating non-sequential memory addresses, and means for adding a redundant bit such as an error correcting code and so on to each predetermined quantity unit of data, wherein when the input data has no correlation with adjacent input data, the input data is sequentially written in the memory by the first address control means, read out therefrom, added with the redundant bit, and sequentially recorded on the recording medium without changing the order of the inputted data, while when the input data has a correlation with adjacent input data, the input data is written in the memory by the second address control means in scrambled form, read out therefrom, as scrambled, and then the scrambled data is added to the redundant bit and recorded on the recording medium. Essentially the reverse operation takes place upon reproduction of the recorded signals.

摘要翻译： 一种记录和再现装置，包括用于存储要以预定量单位记录的输入数据的存储器，仅产生顺序存储器地址的第一地址控制装置，用于产生非顺序存储器地址的第二地址控制装置， 向每个预定量数据单元添加诸如纠错码等冗余位，其中当输入数据与相邻输入数据没有相关性时，由第一地址控制装置将输入数据顺序写入存储器， 从其中读出并添加了冗余位，并且顺序地记录在记录介质上，而不改变输入数据的顺序，而当输入数据与相邻输入数据具有相关性时，输入数据被写入存储器中 加扰形式的地址控制装置，作为加扰从其中读出，然后将加扰的数据加到冗余位并记录在 记录介质。 本质上，在记录的信号的再现时进行相反的操作。

公开(公告)号：US4774698A

公开(公告)日：1988-09-27

申请号：US919145

申请日：1986-09-08

申请人： Fumiaki Henmi ,  Tamotsu Yamagami

发明人： Fumiaki Henmi ,  Tamotsu Yamagami

IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B7/135 ,  G11B11/105 ,  G11B7/095 ,  G11B11/00

CPC分类号： G11B11/10595 ,  G11B11/10506 ,  G11B11/10576 ,  G11B7/0941

摘要： An optical disc recording and reproducing apparatus incorporates apparatus for recording a modulated signal on an optical disc, using a laser beam, and apparatus for optically reading a signal recorded on the disc. In both recording and reproducing modes, an optical signal is produced from the disc and used to supply a control signal to a servo system, for controlling the position of the laser beam relative to the optical disc. Apparatus is provided for subtracting, from the servo control signal, the low frequency components in the modulated signal being recorded on the disc, to improve the accuracy of focus and tracking of the laser beam relative to the optical disc.

摘要翻译： PCT No.PCT / JP85 / 00668 Sec。 371日期1986年9月8日第 102（e）日期1986年9月8日PCT提交1985年12月5日PCT公布。 出版物WO86 / 04446 日期：1986年7月31日。光盘记录和再现装置包括使用激光束在光盘上记录调制信号的装置，以及用于光学读取记录在盘上的信号的装置。 在记录和再现模式中，从盘产生光信号，并用于向伺服系统提供控制信号，用于控制激光束相对于光盘的位置。 提供了用于从伺服控制信号中减去正在记录在盘上的调制信号中的低频分量的装置，以提高激光束相对于光盘的聚焦和跟踪精度。

公开(公告)号：US4733385A

公开(公告)日：1988-03-22

申请号：US844190

申请日：1986-03-26

申请人： Fumiaki Henmi ,  Kiyoshi Ohsato ,  Tamotsu Yamagami

发明人： Fumiaki Henmi ,  Kiyoshi Ohsato ,  Tamotsu Yamagami

IPC分类号： G11B11/105 ,  G11B19/02 ,  G11B19/20 ,  G11B27/034 ,  G11B27/036 ,  G11B27/30 ,  G11B11/12

CPC分类号： G11B19/20 ,  G11B11/10515 ,  G11B11/10519 ,  G11B11/10595 ,  G11B19/02 ,  G11B27/036 ,  G11B27/3027 ,  G11B27/3063 ,  G11B2220/2525 ,  G11B2220/2545 ,  G11B27/034

摘要： A signal recording and reproducing device for use with an opto-magnetic disk having a number of concentric recording tracks. An optical head sweeps a given track at least twice during a time interval equal to a predetermined reproduction time for the track. Erasure signals and recording signals are supplied to the optical head during the first time sweeping and the second time sweeping, respectively, in order to effect signal erasure and recording. At the time of switching from the first time sweeping to the second time sweeping, the address data indicating the end point written on the terminal portion of the previously recorded signal area are sensed, and the recording is effected from the thus sensed recording end point.

摘要翻译： 一种与具有多个同心记录磁道的光磁盘一起使用的信号记录和再现装置。 光头在等于轨道的预定再现时间的时间间隔内至少扫描给定轨道至少两次。 擦除信号和记录信号分别在第一次扫描和第二次扫描期间被提供给光头，以便进行信号擦除和记录。 在从第一次扫描切换到第二次扫描时，感测到表示写入先前记录的信号区域的终端部分上的结束点的地址数据，并且从如此感测的记录终点进行记录。