公开(公告)号：US5434829A

公开(公告)日：1995-07-18

申请号：US78003

申请日：1993-06-15

申请人： Shigemi Maeda ,  Tomiyuki Numata ,  Kunio Kojima

发明人： Shigemi Maeda ,  Tomiyuki Numata ,  Kunio Kojima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14

CPC分类号： G11B20/10 ,  G11B20/1403

摘要： An information reproducing apparatus has (1) a reference signal generating circuit for generating a first reference signal corresponding to reproduced signal of the main information; (2) a first switching circuit for selecting one of the reproduced signal and the first reference signal; and (3) a controller, which generates a selection instructing signal, for controlling such that the reproduced signal is selected during reproducing of the main information recorded area while the first reference signal is selected during reproducing of the main information unrecorded area. With the arrangement, when the main information unrecorded area is reproduced, the clock for carrying out the reproducing of main information is synchronized with the first reference signal which corresponds to the reproduced signal. So, when the reproducing area is changed from the main information unrecorded area to the main information recorded area, the synchronizing with the reproduced signal is carried out in a short time, thereby improving the reliability of the reproducing process.

摘要翻译： 信息再现装置具有：（1）参考信号发生电路，用于产生对应于主信息的再现信号的第一参考信号; （2）用于选择再现信号和第一参考信号之一的第一切换电路; 以及（3）产生选择指示信号的控制器，用于在再现主信息未记录区域期间选择第一参考信号时在主信息记录区域的再现期间选择重放信号。 利用这种布置，当主信息未记录区域被再现时，用于执行主信息再现的时钟与对应于再现信号的第一参考信号同步。 因此，当再现区域从主信息未记录区域改变到主信息记录区域时，与再现信号同步在短时间内进行，从而提高再现处理的可靠性。

公开(公告)号：US4906874A

公开(公告)日：1990-03-06

申请号：US299001

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B7/125 ,  G11B7/13 ,  G11B11/105 ,  G11B19/04 ,  G11B20/24

CPC分类号： G11B7/126 ,  G11B11/10502 ,  G11B11/10595 ,  G11B19/04 ,  G11B7/00 ,  G11B7/004 ,  G11B7/13

摘要： An analog signal switching device for use in an optical memory device having a recording/erasing mode and a mode other than the recording/erasing mode is disclosed. The switching device includes a source for producing a switch control signal which is HIGH during the recording/erasing mode and LOW during the mode other than the recording/erasing mode. An analog switch is provided for receiving a direct input analog signal and a held input signal and for providing as output the direct input signal during the LOW state of the switch control signal, and the held input signal during the HIGH state of the switch control signal by a switching operation. Further provided is a mask signal generator for generating a mask signal which covers a period during the HIGH state of the switch control signal so as to cover a period during the switching operation of the analog switch, and a gate circuit controlled by the mask signal for allowing the direct input analog signal to pass therethrough during the absence of the mask signal and for preventing the held input signal to pass therethrough during the presence of the mask signal. Thus, noise signals produced by the switching operation of the analog switch are eliminated.

公开(公告)号：US5870375A

公开(公告)日：1999-02-09

申请号：US662221

申请日：1996-06-12

申请人： Shigemi Maeda ,  Kunio Kojima

发明人： Shigemi Maeda ,  Kunio Kojima

IPC分类号： G11B7/24 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B11/105 ,  G11B20/12 ,  G11B21/08 ,  G11B27/19 ,  G11B27/30 ,  G11B3/70

CPC分类号： G11B11/10595 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/0037 ,  G11B7/0045 ,  G11B7/0053 ,  G11B7/007 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/24082 ,  G11B11/10565 ,  G11B2220/2525

摘要： A disk-shaped recording medium has a groove only one of whose side-walls wobbles or deviates in radial directions of the disk in order to prerecord first address information. In addition, the disk medium has block areas in the groove and in the land where the first address information is given and sector areas provided with second address information for every piece of recording data which is divided into predetermined lengths, wherein `m` pieces of sector areas are allocated for `n` pieces of block areas and recorded in the groove and the land (both n and m are integral numbers, and n is smaller than m). The second address information based on the first address information enables the sectors to be set at any length, and improves reliability of the address information. Moreover, the second address information realizes high density recording using both the land and the groove.

摘要翻译： 盘形记录介质具有只有其中一个侧壁在盘的径向方向上摆动或偏离以便预先记录第一地址信息的凹槽。 此外，磁盘介质在凹槽中和在其中给出第一地址信息的区域中的块区域以及被分成预定长度的每条记录数据提供有第二地址信息的扇区区域，其中“m” 扇区区域被分配用于“n”个块区域并被记录在凹槽和平台中（n和m都是整数，n小于m）。 基于第一地址信息的第二地址信息使得能够将扇区设置为任何长度，并且提高地址信息的可靠性。 此外，第二地址信息使用陆地和凹槽两者实现高密度记录。

公开(公告)号：US5010540A

公开(公告)日：1991-04-23

申请号：US225892

申请日：1988-07-29

申请人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B19/247

CPC分类号： G11B19/247

摘要： An apparatus for recording and reproducing information on and from an optical disk includes a first control for producing a first control signal for controlling the rotational speed of a rotational driving apparatus, on the basis of the detected radial position; a judging apparatus which judges whether or not the reproduced signals are reproduced from a recorded region of the optical disk; a second control for producing a second control signal for controlling the rotational speed of the rotational driving apparatus, on the basis of the signals reproduced from the disk; and a switch apparatus which switches the circuit so that the rotational driving apparatus is controlled by the first control signal when the reproduced signals are not reproduced from a non-recorded region, and controlled by the second control signal when the reproduced signals are reproduced from a recorded region.

公开(公告)号：US4910479A

公开(公告)日：1990-03-20

申请号：US299013

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B19/02 ,  G11B20/10

CPC分类号： G11B20/10027 ,  G11B11/10515 ,  G11B11/10597 ,  G11B19/02 ,  G11B20/10009 ,  G11B7/005

摘要： An automatic gain control device for use in an optical memory device has a circuit for producing an amplification control signal which is fed back to a gain control amplifier through a sample-hold circuit. A pulse train detection circuit is provided for detecting the pulse train indicating that the data stored are a on the optical memory device is being playedback. When the pulse train is detected, the sample-hold circuit is made inactive so that the amplification control signal is directly fed back to the gain control amplifier, and when the pulse train ends, the sample-hold circuit is made active to hold the amplification control signal obtained at the end of the pulse train and to produce the amplification control signal held in the sample-hold circuit.

公开(公告)号：US5764607A

公开(公告)日：1998-06-09

申请号：US731125

申请日：1996-10-09

申请人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama

发明人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama

IPC分类号： G11B20/10 ,  G11B7/28 ,  G11B19/02 ,  G11B20/00 ,  G11B23/28 ,  G11B27/00 ,  G11B27/034 ,  G11B27/11 ,  G11B27/32 ,  H04N5/91 ,  G11B7/00

CPC分类号： G11B27/329 ,  G11B19/02 ,  G11B20/00086 ,  G11B20/00666 ,  G11B20/00768 ,  G11B27/034 ,  G11B27/11 ,  G11B7/28 ,  G11B2220/218 ,  G11B2220/2525 ,  G11B2220/2545 ,  G11B23/28

摘要： An information recording and reproduction apparatus uses a recording medium that contains information which prohibits digital copying. A reproduction section reproduces the desired informatiion stored on a first recording medium. A recording section records the reproduced output at a desired position on a second recording medium. However, an erasing section erases the information from the first recording medium during the process of recording that information on the second recording medium. The first and/or second recording medium cannot be removed from the information recording and reproduction apparatus until the erasing operation is completed.

摘要翻译： 信息记录和再现设备使用包含禁止数字复制的信息的记录介质。 再现部分再现存储在第一记录介质上的所需信息。 记录部分将再现的输出记录在第二记录介质上的期望位置。 然而，在将该信息记录在第二记录介质上的过程中，擦除部分擦除来自第一记录介质的信息。 在擦除操作完成之前，第一和/或第二记录介质不能从信息记录和再现设备中移除。

公开(公告)号：US5555229A

公开(公告)日：1996-09-10

申请号：US271492

申请日：1994-07-07

申请人： Kunio Kojima ,  Shigemi Maeda ,  Jun Akiyama

发明人： Kunio Kojima ,  Shigemi Maeda ,  Jun Akiyama

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/10 ,  G11B11/105 ,  G11B20/00 ,  G11B20/10 ,  G11B27/10 ,  G11B27/11 ,  G11B5/09

CPC分类号： G11B27/105 ,  G11B20/00007 ,  G11B27/11 ,  G11B2220/2529 ,  G11B2220/65

摘要： Pieces of leading compressed information, each of which corresponds to a predetermined number of blocks of each of a plurality of programs recorded on an optical disk, are successively read therefrom, and stored in a buffer memory in a compressed state as they are. Upon reproducing a certain program, the corresponding leading compressed information is read from the buffer memory, and reproduced after having been subjected to a decompressing process in an information-decompression processing circuit. The program is continuously reproduced by reading compressed information corresponding to the predetermined number of blocks following the leading compressed information from the optical disk and supplying the compressed information to the buffer memory. With this arrangement, it is possible to eliminate a slow switching operation in the case when programs are switched to start reproducing a different program.

摘要翻译： 它们中的每一个对应于记录在光盘上的多个程序中的每一个的预定数量的块的先导压缩信息的片段被连续地读取，并且按原样存储在缓冲存储器中。 在再现某个程序时，从缓冲存储器中读取对应的前导压缩信息，并且在信息解压缩处理电路中经过解压缩处理之后被再现。 通过读取与来自光盘的引导压缩信息之后的预定数量的块相对应的压缩信息并将压缩信息提供给缓冲存储器来连续再现程序。 通过这种布置，在程序切换开始再现不同的程序的情况下，可以消除缓慢的切换操作。

公开(公告)号：US5457667A

公开(公告)日：1995-10-10

申请号：US7276

申请日：1993-01-21

申请人： Kunio Kojima ,  Shigemi Maeda ,  Jun Akiyama

发明人： Kunio Kojima ,  Shigemi Maeda ,  Jun Akiyama

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B20/00 ,  G11B20/10 ,  G11B27/10 ,  G11B27/11 ,  G11B27/19 ,  G11B27/24 ,  G11B27/32

CPC分类号： G11B27/24 ,  G11B20/00007 ,  G11B20/10 ,  G11B27/105 ,  G11B27/11 ,  G11B27/329 ,  G11B2020/10592 ,  G11B2020/10953 ,  G11B2220/216 ,  G11B2220/2525 ,  G11B2220/2529 ,  G11B2220/2545 ,  G11B2220/65

摘要： A data recording and reproducing apparatus uses a rewriteable optical disk with pre-recorded absolute address information, and comprises a data compression circuit for dividing and compressing continuous digital data into compressed plural data blocks, an expansion circuit to restore the compressed data to the original expanded form, and a buffer memory. Data is compressed in discrete data blocks and is recorded sequentially block by block to the optical disk. The compressed data is likewise read block by block from the disk during data reproduction. Using the data expansion circuit to expand the compressed data one block at a time, the data recording and reproducing apparatus can reproduce the original continuous digital data stream. Plural continuous digital data selections can thus be reproduced by alternately fetching data for the plural selections from the disk in compressed data block units and temporarily storing the data to a buffer memory for expansion.

摘要翻译： 数据记录和再现装置使用具有预先记录的绝对地址信息的可重写光盘，并且包括用于将连续数字数据分割和压缩成压缩的多个数据块的数据压缩电路，扩展电路，以将压缩数据恢复到原始扩展 表单和缓冲存储器。 数据在离散数据块中被压缩，并逐个逐块地记录到光盘。 在数据再现期间，压缩数据同样从盘读取。 数据记录和重放装置可以使用数据扩展电路一次一个地扩展压缩数据，再现原始的连续数字数据流。 因此可以通过以压缩数据块单位交替地从盘中取出多个选择的数据来再现多个连续的数字数据选择，并将数据临时存储到缓冲存储器进行扩展。

公开(公告)号：US5317549A

公开(公告)日：1994-05-31

申请号：US876072

申请日：1992-04-28

申请人： Shigemi Maeda ,  Kunio Kojima

发明人： Shigemi Maeda ,  Kunio Kojima

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/30 ,  G11B11/105 ,  G11B19/02 ,  G11B19/04 ,  G11B20/18 ,  G11B23/36 ,  G11B27/10 ,  G11B27/22

CPC分类号： G11B27/22 ,  G11B11/10595 ,  G11B19/02 ,  G11B19/04 ,  G11B20/182 ,  G11B23/36

摘要： An information recording and reproducing apparatus employs a magneto-optical disk including a main information recording area wherein plural pieces of main information can be recorded and a TOC area wherein control information related to each piece of main information can be recorded. When a reproducing operation cannot be performed from the TOC area, it is checked whether or not any pieces of control information exist, for example, by detecting an amplitude of a reproduced signal. Or, whether or not a recording or reproducing function of the apparatus works properly may be checked by, for example, a method of test writing and reproduction. As a result, whether or not the magneto-optical disk is a blank disk can be accurately determined. Further, when the disk is determined to be a blank disk, distinctive information indicating a blank disk is recorded in a predetermined portion of the TOC area. Thereafter, upon loading the disk, the disk is promptly determined to be a blank disk. On the other hand, when the disk is not determined to be a blank disk, at least a recording operation is inhibited, thereby eliminating a possibility of destroying useful main information already recorded in the main information recording area.

摘要翻译： 信息记录和再现装置采用包括可以记录多条主信息的主信息记录区的磁光盘和可记录与每条主信息相关的控制信息的TOC区。 当不能从TOC区域执行再现操作时，例如通过检测再现信号的幅度来检查是否存在任何控制信息。 或者，可以通过例如测试写入和再现的方法来检查设备的记录或再现功能是否正常工作。 结果，可以准确地确定磁光盘是否为空盘。 此外，当确定盘是空白盘时，指示空白盘的特征信息被记录在TOC区域的预定部分中。 此后，在加载磁盘时，迅速地将磁盘确定为空白磁盘。 另一方面，当盘不被确定为空盘时，至少禁止记录操作，从而消除了已经记录在主信息记录区中的有用主信息的可能性。

公开(公告)号：US5315571A

公开(公告)日：1994-05-24

申请号：US100077

申请日：1993-07-29

申请人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama ,  Shigeo Terashima ,  Tomiyuki Numata

发明人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama ,  Shigeo Terashima ,  Tomiyuki Numata

IPC分类号： G11B7/004 ,  G11B7/085 ,  G11B11/105 ,  G11B19/12 ,  G11B19/24 ,  G11B20/10 ,  G11B20/14 ,  G11B21/08 ,  G11B27/32 ,  G11B7/00

CPC分类号： G11B20/10 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10563 ,  G11B19/12 ,  G11B19/24 ,  G11B20/1403 ,  G11B21/085 ,  G11B27/327 ,  G11B7/004 ,  G11B7/08505 ,  G11B2020/1087 ,  G11B2020/10888 ,  G11B2220/20 ,  G11B2220/2525

摘要： An information recording and reproducing device has a first recording clock generation circuit which generates a clock based on pre-recorded information on a magneto-optical disk, a second recording clock generation circuit and a switching circuit The switching circuit selects a first recording clock when recording information is of discrete information and selects a second recording clock when recording information is of successive information. Moreover, in the present device, a first reading clock is used as well as a second clock as a clock for reading out the reproduced data from the magneto-optical disk, which had been once stored in memory. The second reading clock having a reference frequency is generated by a second clock generation circuit and is used for reading out successive information such as music information. The first reading clock in synchronization with the reproduced signal is generated by a first reading clock generation circuit and is used for reading out discrete information such as computer-use data. In addition, in the case of discrete information, it is possible to start recording/reproducing operation immediately after an optical head reaches a desired position, thereby permitting to shorten an access time.

摘要翻译： 信息记录和再现装置具有第一记录时钟产生电路，其基于磁光盘上的预先记录的信息产生时钟，第二记录时钟产生电路和切换电路。切换电路在记录时选择第一记录时钟 信息是离散信息，并且当记录信息是连续信息时选择第二记录时钟。 此外，在本装置中，使用第一读取时钟以及第二时钟作为用于从已经存储在存储器中的磁光盘读出再现数据的时钟。 具有参考频率的第二读取时钟由第二时钟产生电路产生，并且用于读出诸如音乐信息的连续信息。 与再现信号同步的第一读取时钟由第一读取时钟生成电路产生，并且用于读出诸如计算机使用数据的离散信息。 此外，在离散信息的情况下，可以在光头到达期望位置之后立即开始记录/再现操作，从而允许缩短访问时间。