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11. 发明授权

US5090005A Tape recorder with means for sampling and holding focusing and tracking error signals during discontinuity of tape on surface of rotating drum 失效
标题翻译：磁带录音机，用于在旋转鼓表面上的磁带不连续时采样和保持对焦和跟踪误差信号
公开(公告)号：US5090005A
公开(公告)日：1992-02-18
申请号：US428937
申请日：1989-10-30
申请人： Fumio Hara , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga
发明人： Fumio Hara , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga
IPC分类号： G11B7/00 , G11B7/003 , G11B7/0055 , G11B7/09
CPC分类号： G11B7/09 , G11B7/0031
摘要： A tape recorder of the present invention comprises a pair of feed and take-up spools for winding a tape as recording media, a rotatable drum rotated to wind and run the tape between the pair of spools over the drum surface helically, a head for recording, reproducing or erasing signals on the tape wound over said drum surface, and control means for controlling the relative positional relationship between the head and the tape wound over the drum surface based on an error signal such that said signals are stably recorded, reproduced or erased along a desired track, the control means having means for holding the error signal during the period in which the tape is discontinued over a drum surface. The value of the error signal at the time immediately before the tape disappears from the drum surface, or the value of the error signal at the time immediately after the tape reappears over the drum surface during the preceding rotation of the drum is used as the error signal to be held, thereby allowing to stably restart the positioning control when the tape reappears over the drum surface.
摘要翻译：本发明的磁带录音机包括一对用于卷绕磁带作为记录介质的进给卷轴和卷取卷轴，旋转的滚筒旋转以在螺旋状的卷筒表面上的一对卷轴之间卷绕和运行磁带，用于记录的磁头，再现或擦除在所述鼓表面上缠绕的磁带上的信号;以及控制装置，用于基于误差信号控制磁头和缠绕在磁鼓表面上的磁带之间的相对位置关系，使得所述信号被稳定地记录，再现或擦除所述控制装置具有用于在所述磁带在鼓表面上停止的时段期间保持所述误差信号的装置。在磁带从磁鼓表面消失之前的时刻的误差信号的值，或在磁带的前一个旋转期间磁带重新出现在磁鼓表面之后的时刻的误差信号的值被用作误差信号被保持，从而当带重新出现在滚筒表面上时，允许稳定地重新启动定位控制。

12. 发明授权

US4983965A Demodulation apparatus 失效
标题翻译：解调装置
公开(公告)号：US4983965A
公开(公告)日：1991-01-08
申请号：US444845
申请日：1989-12-04
申请人： Nobukazu Doi , Morishi Izumita , Seiichi Mita , Yoshizumi Eto
发明人： Nobukazu Doi , Morishi Izumita , Seiichi Mita , Yoshizumi Eto
IPC分类号： G11B20/14 , H03M5/14
CPC分类号： H03M5/14
摘要： An original digital signal is converted into either a Miller-squared code signal or a Miller code signal, and undergoes serial-to-parallel conversion to produce n-phase signals (where n is desired to be a positive even number). N-phase virtual demodulated signals are simultaneously generated at clock timing having a period equivalent to 1/n times the period of the transmission clock. Out of the n-phase virtual demodulated signals, n/2 phases are selected to undergo parallel-to-serial conversion, the original digital signal being thus obtained.
摘要翻译：原始数字信号被转换成米勒平方码信号或米勒码信号，并进行串并转换以产生n相信号（其中n希望为正偶数）。在具有相当于传输时钟的周期的1 / n倍的周期的时钟定时处同时产生N相虚拟解调信号。在n相虚拟解调信号中，选择n / 2相进行并行到串行转换，从而获得原始数字信号。

13. 发明授权

US07296215B2 Signal processing method and signal processing circuit 有权
标题翻译：信号处理方法和信号处理电路
公开(公告)号：US07296215B2
公开(公告)日：2007-11-13
申请号：US10922227
申请日：2004-08-18
申请人： Morishi Izumita , Terumi Takashi , Hideki Sawaguchi , Seiichi Mita
发明人： Morishi Izumita , Terumi Takashi , Hideki Sawaguchi , Seiichi Mita
IPC分类号： H03M13/03
CPC分类号： H03M13/29 , G11B20/10009 , H03M13/1111 , H03M13/1191 , H03M13/1515 , H03M13/2703 , H03M13/3746 , H03M13/45 , H03M13/6343 , H03M13/6505
摘要： In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.
摘要翻译：在一个实施例中，符号纠错编码器对记录数据执行块交织，并且此后对记录数据执行第一纠错编码。接下来，符号纠错编码器对整个块执行编码。再现处理电路输出各位的似然信息。第一纠错解码器使用似然信息校正记录和再现时产生的随机误差。由于此时可以通过重复解码对随机误差进行性能改善，所以后校正数据返回到再生处理电路。在完成这样的重复处理之后，数据被数字化，并通过硬判断进行符号单位的纠错，并将其输出到符号纠错解码器。

14. 发明授权

US06731441B2 Information recording and reproducing apparatus 失效
标题翻译：信息记录和再现装置
公开(公告)号：US06731441B2
公开(公告)日：2004-05-04
申请号：US10214599
申请日：2002-08-09
申请人： Hideaki Maeda , Morishi Izumita , Terumi Takashi , Seiichi Mita
发明人： Hideaki Maeda , Morishi Izumita , Terumi Takashi , Seiichi Mita
IPC分类号： G11B2006
CPC分类号： G11B20/1403 , G11B20/10009
摘要： Here is disclosed an information recording and reproducing apparatus comprising a multi-phase quadrature angular modulator for subjecting a signal to be written on a recording medium to multi-phase quadrature angular modulation to generate a modulated signal expressing information in phase difference and frequency difference, a quantizer for generating a discrete signal by making discrete the amplitude of the modulated signal generated by the quadrature angular modulator with reference to a certain level, a write head for writing the output signal of the quantizer onto the recording medium, a read head for reading information written on the recording medium, a read compensate circuit for compensating the phase and amplitude of a signal readout of the read head, and a multi-phase quadrature angular demodulator for demodulating a signal supplied from the read compensate circuit by subjecting it to multi-phase quadrature angular demodulation. By expressing information to be recorded in phase difference or frequency difference, it is made possible to record or reproduce the information at the varying timing of amplitude, and the bit inversion interval can be controlled by regulating the timing of amplitude variation.
摘要翻译：这里公开了一种信息记录和再现装置，包括一个多相正交角度调制器，用于使信号被写入记录介质以进行多相正交角度调制以产生表示相位差和频差的信息的调制信号，量化器，用于通过使由正交角调制器产生的调制信号的幅度相对于一定电平离散来产生离散信号，用于将量化器的输出信号写入记录介质的写入头，用于读取信息的读取头写在记录介质上的读取补偿电路，用于补偿读取头的信号读出的相位和幅度的读取补偿电路;以及多相正交角解调器，用于对从读取的补偿电路提供的信号进行多相正交角解调。通过表示要以相位差或频率差记录的信息，可以在变化的幅度定时记录或再现信息，并且可以通过调节幅度变化的定时来控制位反转间隔。

15. 发明授权

US5036524A Binary data signal transmission system 失效
标题翻译：二进制数据信号传输系统
公开(公告)号：US5036524A
公开(公告)日：1991-07-30
申请号：US473251
申请日：1990-01-29
申请人： Johannes W. M. Bergmans , Seiichi Mita , Morishi Izumita , Nobukazu Doi
发明人： Johannes W. M. Bergmans , Seiichi Mita , Morishi Izumita , Nobukazu Doi
IPC分类号： H03M5/14 , H03M5/06 , H04L25/03 , H04L25/49 , H04L25/497
CPC分类号： H04L25/497 , H04L25/03019
摘要： In a system for transmitting a binary source signal from a data transmitter to a data receiver through a noisy dispersive channel, the data transmitter includes a sliding block encoder which converts the binary source signal at a given symbol rate 1/T into an encoded binary data signal at a symbol rate P/(NT), where P and N are positive integers such that N/P.ltoreq..sup.2 log(3)/2= 0.79248. Since the channel introduces intersymbol interference and noise into the encoded data signal, the data receiver is formed from the cascade of an equalizer, a sampler and a reconstruction circuit which serves to reconstruct the binary source signal at the symbol rate 1/T. The reconstruction circuit includes a detector in a cascade with a decoder having memory the equalizer, sampler and detector are arranged for the detection of a ternary data signal at the symbol rate P/(2NT).

16. 发明授权

US5005184A Method and apparatus for waveform equalization 失效
标题翻译：用于波形均衡的方法和装置
公开(公告)号：US5005184A
公开(公告)日：1991-04-02
申请号：US240196
申请日：1988-09-06
申请人： Tetsuya Amano , Seiichi Mita , Morishi Izumita , Nobukazu Doi , Mamoru Kaneko , Hiroto Yamauchi , Susumu Kasai
发明人： Tetsuya Amano , Seiichi Mita , Morishi Izumita , Nobukazu Doi , Mamoru Kaneko , Hiroto Yamauchi , Susumu Kasai
IPC分类号： H04B3/06 , G11B20/10 , H03H15/00 , H04L25/03
CPC分类号： H04L25/03127 , H03H15/00
摘要： A waveform equalization method whereby a transversal filter having 5 or more tapes is included, and a difference signal output, which is obtained when an isolated impulse response waveform of a digital modulated signal is inputted to the above described filter and the output of the filter is inputted to an adder, is allowed to have intersymbol interference at .+-.T/2 with respect to the central axis time and has zero outputs at .+-.nT/2 (where n.gtoreq.2 and n is an integer).
摘要翻译：包括具有5个或更多个磁带的横向滤波器的波形均衡方法，以及当将数字调制信号的隔离脉冲响应波形输入到上述滤波器并且滤波器的输出是获得的差分信号输出输入到加法器，允许相对于中心轴时间在+/- T / 2处具有符号间干扰，并且在+/- nT / 2处具有零输出（其中n≥2且n是整数）。

17. 发明授权

US4970707A Optical tape apparatus with a tracking control mechanism and/or a focusing control mechanism 失效
标题翻译：具有跟踪控制机构和/或聚焦控制机构的光带装置
公开(公告)号：US4970707A
公开(公告)日：1990-11-13
申请号：US239389
申请日：1988-09-01
申请人： Fumio Hara , Yoshito Tsunoda , Shigeru Nakamura , Yoshizumi Eto , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga , Masuo Kasai
发明人： Fumio Hara , Yoshito Tsunoda , Shigeru Nakamura , Yoshizumi Eto , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga , Masuo Kasai
IPC分类号： G11B7/003 , G11B7/09
CPC分类号： G11B7/09 , G11B7/0031 , G11B7/0925
摘要： An optical tape apparatus having improved focus and tracking control. An optical head records, reproduces, or rewrites data on an optical tape by helically scanning the tape with a laser beam. A guide plate is disposed between the optical head and the tape to prevent the beam from becoming unfocused due to fluctuation of the tape cuased by an air film between the optical head and the tape. The optical head contains a semiconductor laser and an optical system exhibiting chromatic aberration for directing the laser beam onto the tape. The optical system includes a condenser lens for focusing the beam onto the tape. Fine focus control is achieved by changing the wavelength of the laser beam by directing part of the beam reflected from the tape back to the laser, thereby changing the focal point of the beam by virtue of the chromatic aberration of the optical system. Coarse focus control is achieved by mounting the condenser lens on a piezoelectric actuator which moves the consenser lens to focus the beam onto the tape. A recording head for recording timing marks and tracking signals on the tape is disposed in advance of the optical head. A reading head reads the timing marks and the optical head reads the tracking signals. The timing marks and tracking signals are used to control the operation of the apparatus such that the tape is transported with a constant speed and data on diagonal signal tracks on the tape is accurately recorded, reproduced, or rewritten.
摘要翻译：具有改进的聚焦和跟踪控制的光带装置。光学头通过用激光束螺旋扫描磁带来记录，再现或重写光学带上的数据。引导板设置在光头和带之间，以防止由于光头和带之间的空气膜带来的带的波动而导致光束不聚焦。光头包含半导体激光器和具有用于将激光束引导到带上的色差的光学系统。光学系统包括用于将光束聚焦到胶带上的聚光透镜。通过将从带反射的光束的一部分引回到激光器来改变激光束的波长，从而通过光学系统的色差来改变光束的焦点来实现精细对焦控制。通过将聚光透镜安装在压电致动器上来实现粗调焦控制，该压电致动器移动辅助透镜以将光束聚焦到带上。在光学头之前设置用于在带上记录定时标记和跟踪信号的记录头。读头读取定时标记，光头读取跟踪信号。定时标记和跟踪信号用于控制装置的操作，使得磁带以恒定速度传送，并且磁带上对角线信号轨道上的数据被精确地记录，再现或重写。

18. 发明授权

US4764927A Code error correcting method 失效
标题翻译：代码纠错方法
公开(公告)号：US4764927A
公开(公告)日：1988-08-16
申请号：US909336
申请日：1986-09-19
申请人： Morishi Izumita , Seiichi Mita , Nobukazu Doi , Fuyuki Inui , Akira Saito , Mamoru Kaneko
发明人： Morishi Izumita , Seiichi Mita , Nobukazu Doi , Fuyuki Inui , Akira Saito , Mamoru Kaneko
IPC分类号： H03M13/00 , G11B20/18 , H03M13/29 , G06F11/10
CPC分类号： H03M13/29
摘要： An error detection and/or correction is achieved in the horizontal direction in a block and then an error state is determined by use of an error correction in the vertical direction; furthermore, the correcting system is changed over according to the result of the determination.
摘要翻译：在块中的水平方向上实现错误检测和/或校正，然后通过使用垂直方向的纠错来确定错误状态; 此外，根据确定的结果来改变校正系统。

19. 发明授权

US5151924A Automatic equalization method and apparatus 失效
标题翻译：自动均衡方法及装置
公开(公告)号：US5151924A
公开(公告)日：1992-09-29
申请号：US454406
申请日：1989-12-21
申请人： Seiichi Mita , Morishi Izumita , Hiroshi Ide , Nobukazu Doi , Yoshinori Okada , Yasuo Inagaki
发明人： Seiichi Mita , Morishi Izumita , Hiroshi Ide , Nobukazu Doi , Yoshinori Okada , Yasuo Inagaki
IPC分类号： G11B5/09 , G11B20/10 , H03H15/00 , H04B3/06 , H04L25/03 , H04N5/926 , H04N5/93
CPC分类号： H04L25/03038 , G11B20/10009 , H04N5/926 , H04N5/93
摘要： An automatic equalization apparatus useful for supplying an output signal of a transversal filter simultaneously to two juxtaposed comparators, one of the two comparators performing signal identification, the other of the two comparators detecting an equalization error with the reference level changed, and extracting data from resultant two kinds of data trains by taking at least (N-1)/2+1 bits as the unit, N being the number of taps of the transversal filter, performing correlation computation, and setting tap coefficients of the transversal filter on the basis of the resultant accumulated value.
摘要翻译：一种自动均衡装置，用于同时向两个并置的比较器提供横向滤波器的输出信号，两个比较器之一执行信号识别，两个比较器中的另一个比较器检测参考电平改变的均衡误差，并从结果中提取数据通过以至少（N-1）/ 2 + 1位为单位，N为横向滤波器的抽头数，执行相关计算，以及基于横向滤波器的抽头系数设置两种数据串产生累计值。

20. 发明授权

US5131011A Receiver for data transmission system with nonlinearities 失效
标题翻译：具有非线性数据传输系统的接收器
公开(公告)号：US5131011A
公开(公告)日：1992-07-14
申请号：US545308
申请日：1990-06-26
申请人： Johannes W. M. Bergmans , Seiichi Mita , Morishi Izumita
发明人： Johannes W. M. Bergmans , Seiichi Mita , Morishi Izumita
IPC分类号： G11B20/18 , H04L1/20 , H04L25/03 , H04L25/08
CPC分类号： H04L25/03337
摘要： Non-linear intersymbol interference and noise in a received data signal are corrected through use of a Viterbi detector which estimates the most likely sequence of transmitted data symbols by keeping track of candidate data sequence that are recursively updated, based on likelihood measures which are determined by a signal processor which includes circuits for estimating hypothesized channel outputs in the absence of noise. Non-linear input-output relations are stored in one or more look-up tables which, in a preferred embodiment, are registers that store hypothesized channel output symbols in the absence of noise. The contents of the look-up tables may be modified in response to an error signal representative of the difference of the channel output signal and the look-up table output signal.

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