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151 条记录 (耗时 0.031 秒)

    Magnetic recording and reproducing device
    1.
    发明授权
    Magnetic recording and reproducing device 失效
    磁记录和再现装置

    公开(公告)号：US5414567A

    公开(公告)日：1995-05-09

    申请号：US625822

    申请日：1990-12-11

    申请人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Akira Abeta ,  Takao Arai ,  Kouei Usuda

    发明人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Akira Abeta ,  Takao Arai ,  Kouei Usuda

    IPC分类号： G11B5/02 ,  G11B20/10 ,  H04N5/782 ,  H04N9/802 ,  H04N9/835 ,  H04N5/78

    CPC分类号： H04N9/835 ,  G11B20/10 ,  H04N5/78213 ,  H04N9/802

    摘要： A magnetic recording method and apparatus which performs a quadrature phase shift keying operation on a digital information signal, superimposes a high frequency bias signal on the performed signal, records the resulting signal into a deep portion of a magnetic layer of a magnetic tape with a first rotational head, and records a video signal in a surface portion of the magnetic layer above a track formed by the former recording, with a second rotational head which is different in azimuth angle from the first rotational head, the frequency of the high frequency bias signal being set to a value which is about four times as high as the carrier frequency of the quadrature phase shift keyed digital information signal, thereby eliminating a 5th-order distortion component due to cross modulation of the high frequency bias signal and the carrier frequency.

    摘要翻译： 对数字信息信号执行正交相移键控操作的磁记录方法和装置，在所执行的信号上叠加高频偏置信号，将所得到的信号记录在磁带的磁性层的深部，第一 旋转头，并且利用与第一旋转头的方位角不同的第二旋转头将磁性层的表面部分中的视频信号记录在由前一记录形成的轨道上，高频偏置信号的频率 被设置为正交相移键控数字信息信号的载波频率的约四倍的值，从而消除由于高频偏置信号和载波频率的交叉调制引起的5阶失真分量。

    Recording and reproducing system and equalizing method for use in it
    3.
    发明授权
    Recording and reproducing system and equalizing method for use in it 失效
    录音和再现系统及其均衡方法

    公开(公告)号：US5602816A

    公开(公告)日：1997-02-11

    申请号：US517584

    申请日：1995-08-22

    申请人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    发明人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14 ,  G11B27/36

    CPC分类号： G11B20/10046 ,  G11B20/10009 ,  G11B20/10527 ,  G11B20/1426 ,  G11B7/005

    摘要： An object of the present invention is to increase the recording density of digital information signal in a recording medium without changing parameters of the recording medium and a RLL code. To accomplish the object, the present invention has a frequency response of the equalizer set so that an overall transmission frequency characteristic H(f) of the RLL coder, the recording medium, and the equalizer to an impulse becomes the one given by an equation below ##EQU1## where Fm denotes a cut-off frequency of the recording medium.

    摘要翻译： 本发明的目的是提高记录介质中的数字信息信号的记录密度，而不改变记录介质的参数和RLL代码。 为了实现该目的，本发明具有均衡器组的频率响应，使得RLL编码器，记录介质和与脉冲的均衡器的总体传输频率特性H（f）成为由下面的等式给出的 其中Fm表示记录介质的截止频率。

    Recording and reproducing system and equalizing method for use in it
    4.
    发明授权
    Recording and reproducing system and equalizing method for use in it 失效
    录音和再现系统及其均衡方法

    公开(公告)号：US5777966A

    公开(公告)日：1998-07-07

    申请号：US848560

    申请日：1997-04-28

    申请人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    发明人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14

    CPC分类号： G11B20/10046 ,  G11B20/10009 ,  G11B20/10527 ,  G11B20/1426 ,  G11B7/005

    摘要： An object of the present invention is to increase the recording density of digital information signal in a recording medium without changing parameters of the recording medium and a RLL code. To accomplish the object, the present invention has a frequency response of the equalizer set so that an overall transmission frequency characteristic H(f) of the RLL coder, the recording medium, and the equalizer to an impulse becomes the one given by an equation below ##EQU1## where Fm denotes a cut-off frequency of the recording medium.

    摘要翻译： 本发明的目的是提高记录介质中的数字信息信号的记录密度，而不改变记录介质的参数和RLL代码。 为了实现该目的，本发明具有均衡器组的频率响应，使得RLL编码器，记录介质和与脉冲的均衡器的总体传输频率特性H（f）成为由下面的等式给出的 其中Fm表示记录介质的截止频率。

    Reproducing system and equalizing method for use in it
    5.
    发明授权
    Reproducing system and equalizing method for use in it 失效
    复制系统和均衡方法用于其中

    公开(公告)号：US5650989A

    公开(公告)日：1997-07-22

    申请号：US692091

    申请日：1996-08-07

    申请人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    发明人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14

    CPC分类号： G11B20/10046 ,  G11B20/10009 ,  G11B20/10527 ,  G11B20/1426 ,  G11B7/005

    摘要： An object of the present invention is to increase the recording density of digital information signal in a recording medium without changing parameters of the recording medium and a RLL code. To accomplish the object, the present invention has a frequency response of the equalizer set so that an overall transmission frequency characteristic H(f) of the RLL coder, the recording medium, and the equalizer to an impulse becomes the one given by an equation below ##EQU1## where Fm denotes a cut-off frequency of the recording medium.

    摘要翻译： 本发明的目的是提高记录介质中的数字信息信号的记录密度，而不改变记录介质的参数和RLL代码。 为了实现该目的，本发明具有均衡器组的频率响应，使得RLL编码器，记录介质和与脉冲的均衡器的总体传输频率特性H（f）成为由下面的等式给出的 其中Fm表示记录介质的截止频率。

    Recording and reproducing system and equalizing method for use in it.
    6.
    发明授权
    Recording and reproducing system and equalizing method for use in it. 失效
    录音和再现系统及其均衡方法。

    公开(公告)号：US06219320B1

    公开(公告)日：2001-04-17

    申请号：US09048987

    申请日：1998-03-27

    申请人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    发明人： Nobutaka Amada ,  Toshifumi Takeuchi ,  Takao Arai

    IPC分类号： G11B700

    CPC分类号： G11B20/10046 ,  G11B7/005 ,  G11B20/10009 ,  G11B20/10527 ,  G11B20/1426

    摘要： An optical disk medium to which a digital information signal modulated by using a run length limited code in which the minimum run length is d is recorded. The digital information signal is recorded at a bit rate Fb satisfying the equation Fb=K·d·Fm, wherein a cut-off frequency in frequency response of said optical disk medium is Fm, and a value of a coefficient K regarding recording density is larger than 1.

    摘要翻译： 记录通过使用其中最小游程长度为d的游程长度受限码调制的数字信息信号的光盘介质。 以符合式Fb = KdFm的比特率Fb记录数字信息信号，其中所述光盘介质的频率响应中的截止频率为Fm，关于记录密度的系数K的值大于1 。

    Apparatus for recording and reproducing digital information signals of different transmission rates
    7.
    发明授权
    Apparatus for recording and reproducing digital information signals of different transmission rates 失效
    用于记录和再现不同传输速率的数字信息信号的装置

    公开(公告)号：US06441979B1

    公开(公告)日：2002-08-27

    申请号：US08405288

    申请日：1995-03-16

    申请人： Nobutaka Amada ,  Takaharu Noguchi ,  Takao Arai

    发明人： Nobutaka Amada ,  Takaharu Noguchi ,  Takao Arai

    IPC分类号： G11B509

    CPC分类号： G11B20/00007 ,  G11B15/125 ,  G11B15/1875 ,  G11B15/4673 ,  G11B20/10527 ,  G11B20/1866 ,  G11B27/3027 ,  G11B2020/10592 ,  G11B2220/90 ,  H04N5/78263 ,  H04N5/9201 ,  H04N5/9261 ,  H04N5/93

    摘要： In a digital information recording and reproducing apparatus of a rotary magnetic head type for selecting and recording a plurality of digital information signals having different transmission rates and for selectively reproducing the recorded signal, a high-rate digital information signal and a low-rate digital information signal are inputted for selection of either one thereof to be converted by a recording-system encoder into two channels of recording signals. When recording the high-rate signal, the rotary drum is turned at a rotation speed and the magnetic tape is fed at a feed speed (V1) to conduct 4-track azimuth recording of the signals for each rotation of the rotary drum by the first to fourth magnetic heads. To record the low-rate signal, the rotary drum is turned at a rotation speed substantially equal to the first rotation speed and the magnetic tape is fed at a feed speed almost equal to (V1/N) so as to achieve 4-track azimuth recording of record signals compressed on a time axis to 1/N of the original signals for every N rotations of the rotary drum by the magnetic heads. A reproducing system receives two channels of signals reproduced by the first to fourth magnetic heads and conducts for the signals such processes reverse to those of the encoding process of the recording system.

    摘要翻译： 在用于选择和记录具有不同传输速率的多个数字信息信号并用于选择性地再现记录信号的旋转磁头类型的数字信息记录和再现装置中，高速数字信息信号和低速数字信息 输入信号以选择要由记录系统编码器转换成两个通道的记录信号。 当记录高速率信号时，旋转磁鼓以转速转动，磁带以进给速度（V1）进给，以便通过第一个旋转磁鼓对旋转磁鼓的每次旋转的信号进行四磁道方位记录 到第四磁头。 为了记录低速率信号，旋转磁鼓以基本上等于第一转速的转速转动，并且磁带以几乎等于（V1 / N）的馈送速度馈送，以便实现4磁道方位角 通过磁头对旋转磁鼓的每N次旋转记录在时间轴上压缩的记录信号为原始信号的1 / N。 再现系统接收由第一至第四磁头再现的两个信道信道，并对与记录系统的编码处理相反的处理进行传送。