公开(公告)号：US06304402B1

公开(公告)日：2001-10-16

申请号：US09637498

申请日：2000-08-11

申请人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

发明人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

IPC分类号： G11B503

CPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/035 ,  G11B20/10009 ,  G11B2005/0016 ,  H03H17/06

摘要： The equalizer is capable of generating an equalized output that is compensated in the non-linearity of the signal reproduced by an MR head and a reliable high-density magnetically recorded-signal reproducer. The equalizer of an FIR-type filter structure includes a plurality of delay elements for delaying an input signal by a certain period, a plurality of coefficient processing units provided to input or output taps of the delay elements, and an adder for obtaining the sum of the outputs of the coefficient processing units. The distortion of the reproduced waveform can be corrected by a relatively simple circuit structure by comparing the signal value inputted to the coefficient processing unit from each tap with a predetermined threshold level and changing the signal value and a coefficient value to be multiplied in accordance with the comparison result. Therefore, any one of various existing signal processing systems can be applied to the decoding of reproduced signals of an MR head having the non-linear characteristic.

摘要翻译： 均衡器能够产生均衡的输出，该均衡输出以由MR头和可靠的高密度磁记录信号再现器再现的信号的非线性来补偿。 FIR型滤波器结构的均衡器包括用于将输入信号延迟一定周期的多个延迟元件，提供给输入或输出延迟元件抽头的多个系数处理单元，以及用于获得 系数处理单元的输出。 通过将输入到系数处理单元的每个抽头的系数处理单元的信号值与预定的阈值电平相比较，可以通过相对简单的电路结构来校正再现波形的失真，并且根据该调整信号值改变信号值和要乘以的系数值 比较结果。 因此，各种现有信号处理系统中的任一种可以应用于具有非线性特性的MR头的再现信号的解码。

公开(公告)号：US5970091A

公开(公告)日：1999-10-19

申请号：US756648

申请日：1996-11-26

申请人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

发明人： Yasutaka Nishida ,  Seiichi Mita ,  Naoki Satoh ,  Yoshiju Watanabe

IPC分类号： G11B5/00 ,  G11B5/02 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10 ,  H03H17/06 ,  H03H7/30

CPC分类号： G11B5/09 ,  G11B20/10009 ,  H03H17/06 ,  G11B2005/0016 ,  G11B5/012 ,  G11B5/035

摘要： The object of the invention is to provide an equalizer capable of generating an equalized output compensated in the non-linearity of the signal reproduced by an MR head and a reliable high-density magnetically recorded-signal reproducer. An equalizer of an FIR-type filter structure comprises a plurality of delay elements for delaying input signals by a certain period, a plurality of coefficient processing units provided to input or output taps of the delay elements, and an adder for obtaining the sum of the outputs of the coefficient processing units, in which the distortion of the reproduced waveform can be corrected by a relatively simple circuit structure by comparing the signal value inputted to the coefficient processing unit from each tap with a predetermined threshold level and changing the signal value and a coefficient value to be multiplied in accordance with the comparison result. Therefore, any one of various existing signal processing systems can be applied to the decoding of reproduced signals of an MR head having the non-linear characteristic.

摘要翻译： 本发明的目的是提供一种均衡器，其能够产生以由MR头和可靠的高密度磁记录信号再现器再现的信号的非线性补偿的均衡输出。 FIR型滤波器结构的均衡器包括用于将输入信号延迟一定周期的多个延迟元件，提供给输入或输出延迟元件的抽头的多个系数处理单元，以及用于获得 通过将输入到每个抽头的系数处理单元的信号值与预定的阈值电平进行比较，并且改变信号值，可以通过相对简单的电路结构校正再现波形的失真的输出 根据比较结果乘以系数值。 因此，各种现有信号处理系统中的任一种可以应用于具有非线性特性的MR头的再现信号的解码。

公开(公告)号：US5659309A

公开(公告)日：1997-08-19

申请号：US389773

申请日：1995-02-16

申请人： Terumi Takashi ,  Yasuhide Ouchi ,  Seiichi Mita ,  Akihiko Hirano ,  Naoki Satoh

发明人： Terumi Takashi ,  Yasuhide Ouchi ,  Seiichi Mita ,  Akihiko Hirano ,  Naoki Satoh

IPC分类号： G11B20/18 ,  G11B20/10 ,  H03M13/23 ,  H03M13/41 ,  H03M7/00

CPC分类号： H03M13/6343 ,  G11B20/10009 ,  H03M13/41

摘要： A data recording/reproducing apparatus and method therefor having a Viterbi decoder which stores operation result values of an inputted reproduced signal and the reference value when the peak value of the reproduced signal is updated, compares this value with the reproduced signal in amplitude, updates the stored value when the result satisfies the predetermined condition, detects a change in the polarity of the comparison result, controls the clock counter depending on the status of the peak value updating signal, sets 1 in the shift register at the position indicated by the counter according to the detected polarity inversion signal when the peak value is updated, and accordingly makes the updating and detecting operations independent of operations of addition and subtraction of the current reproduced signal and reference value and operations of addition and subtraction of amplitude comparison.

摘要翻译： 一种数据记录/再现装置和方法，其具有维特比解码器，其在再现信号的峰值被更新时存储输入的再现信号的运算结果值和参考值，将该值与振幅的再现信号进行比较，更新 当结果满足预定条件时，存储值检测比较结果的极性的变化，根据峰值更新信号的状态来控制时钟计数器，根据计数器指示的位置在移位寄存器中设置1 当更新峰值时检测到的极性反转信号，并且因此使得更新和检测操作与当前再现信号的加法和减法操作无关，参考值和幅度比较的相加和减法操作。

公开(公告)号：US5642343A

公开(公告)日：1997-06-24

申请号：US87777

申请日：1993-07-09

申请人： Tsuyoshi Toda ,  Kazuo Shigematsu ,  Seiichi Mita ,  Toshimitsu Kaku ,  Takeshi Maeda ,  Fumiyoshi Kirino ,  Hiroshi Ide ,  Atsushi Saito

发明人： Tsuyoshi Toda ,  Kazuo Shigematsu ,  Seiichi Mita ,  Toshimitsu Kaku ,  Takeshi Maeda ,  Fumiyoshi Kirino ,  Hiroshi Ide ,  Atsushi Saito

IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B7/00

CPC分类号： G11B11/10506 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10212 ,  G11B20/1816 ,  G11B7/0045 ,  G11B7/126 ,  G11B7/24085 ,  G11B11/10517 ,  G11B20/1258

摘要： An optical method for recording, reproducing, and erasing a digital signal of a mark length recording system onto/from an optical recording medium such as an optical disc or the like eliminates a fluctuation of the edge position of the reproduction signal due to heat interference between pits, thereby reducing a fluctuation of the edge position due to a fluctuation of external environmental conditions. For this purpose, there are proposed the following methods: 1) the shape of the recording pulse waveform is controlled, 2) the density at which data is recorded to the disc is variably set in accordance with the disc position, 3) a test recording is executed prior to recording user data, and the like. With these methods, a superhigh density optical recording can be realized.

摘要翻译： PCT No.PCT / JP92 / 01460 Sec。 371日期：1993年7月9日 102（e）日期1993年7月9日PCT 1991年11月10日PCT PCT。 公开号WO93 / 10527 日期：1993年5月27日用于记录，再现和擦除标记长度记录系统的数字信号到诸如光盘等的光学记录介质上的光学方法消除了由于再现信号的边缘位置的波动 以加热凹坑之间的干扰，从而减少由于外部环境条件的波动引起的边缘位置的波动。 为此，提出了以下方法：1）记录脉冲波形的形状被控制，2）根据光盘位置可变地设置数据记录到盘的密度，3）测试记录 在记录用户数据之前执行等。 利用这些方法，可以实现超高密度光学记录。

公开(公告)号：US5590111A

公开(公告)日：1996-12-31

申请号：US91003

申请日：1993-07-13

申请人： Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroshi Ide ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Tsuyoshi Toda

发明人： Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroshi Ide ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Tsuyoshi Toda

IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B7/00 ,  G11B3/90 ,  G11B5/09

CPC分类号： G11B7/126 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10212 ,  G11B20/1816 ,  G11B7/0045 ,  G11B7/1267 ,  G11B11/10506 ,  G11B11/10508 ,  G11B20/1258 ,  G11B7/24085

摘要： In a write control method on an optical recording, at least one shift amount selected from the defocus amount of a laser beam on a recording medium, the shift amount of a recording position on a recording track and the shift amount of laser power during recording is controlled such that the selected amount falls within a predetermined range. Subsequently, a trial signal is trially recorded at a plurality of trial zones on the recording medium by using a laser power value as a parameter. The recorded trial signal is read and a difference .DELTA.V between center levels of a highest density waveform and a lowest density waveform is detected. In connection with each trial zone, the laser power value when a reading trial signal which makes the difference .DELTA.V minimum is recorded is defined as an optimum recording power value. Regular data is recorded at a predetermined storage area on the recording medium by using an optimum laser power value determined in connection with a trial zone closest to the predetermined storage area.

摘要翻译： 在光学记录中的写入控制方法中，从记录介质上的激光束的散焦量，记录轨道上的记录位置的偏移量和记录期间的激光功率的移动量选择的至少一个偏移量是 被控制使得所选择的量落在预定范围内。 随后，通过使用激光功率值作为参数，在记录介质上的多个试验区上试用信号。 读取记录的试验信号，并检测最高密度波形的中心水平和最低密度波形之间的差ΔTA。 结合每个试验区域，当记录使DELTA V最小值的读取试验信号被记录时的激光功率值被定义为最佳记录功率值。 通过使用与最接近预定存储区域的试验区域确定的最佳激光功率值，将正常数据记录在记录介质上的预定存储区域。

公开(公告)号：US5457666A

公开(公告)日：1995-10-10

申请号：US114062

申请日：1993-08-31

申请人： Tsuyoshi Toda ,  Hiroshi Ide ,  Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroyuki Tsuchinaga ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu

发明人： Tsuyoshi Toda ,  Hiroshi Ide ,  Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroyuki Tsuchinaga ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B7/24

CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/1053 ,  G11B7/0045 ,  G11B7/006

摘要： A magneto-optical disk recording control method using the mark length recording method wherein the marks and gap regions between marks are recorded on the surface of the disk by maintaining a constant temperature distribution during the recording. The laser is driven to a non-recording level in gap regions between marks that exceed a base recording level used for reproduction of the marks. When a mark is recorded, the laser power is increased to a recording power level and after the mark has been recorded, the laser power level is reduced to the base power level, followed by being raised to the gap recording level. Control of the laser is performed by superposing a plurality of pulse trains that are synchronized with respect to a clock having a cycle T. The pulse trains are derived from the code train to be recorded and have pulses with a duration that is an integral multiple of (1/2)T. If the pulse width of the recording code train exceeds 2T, then the laser is controlled to reach a first power level in accordance with pulses of a first pulse train, be reduced to the gap recording level and then raised to a second power level in accordance with a second recording pulse train to maintain the temperature distribution constant during the recording of the mark. For the recording of longer marks, the laser is controlled to vary between the second power level and the gap recording level.

摘要翻译： 一种使用标记长度记录方法的磁光盘记录控制方法，其中通过在记录期间保持恒定的温度分布将标记之间的标记和间隙区域记录在盘的表面上。 在超过用于再现标记的基本记录水平的标记之间的间隙区域中激光被驱动到非记录水平。 当记录标记时，激光功率增加到记录功率水平，并且在记录标记之后，激光功率水平降低到基本功率水平，然后升高到间隙记录水平。 通过叠加相对于具有周期T的时钟同步的多个脉冲串来执行激光的控制。脉冲序列是从要被记录的代码序列导出的，具有持续时间为整数倍的脉冲 （1/2）T。 如果记录代码串的脉冲宽度超过2T，则根据第一脉冲序列的脉冲将激光器控制到达到第一功率电平，减小到间隙记录电平，然后依次升高到第二功率电平 具有第二记录脉冲串，以在记录记录期间保持温度分布恒定。 为了记录更长的标记，激光器被控制在第二功率电平和间隙记录电平之间变化。

公开(公告)号：US5412632A

公开(公告)日：1995-05-02

申请号：US28224

申请日：1993-03-09

申请人： Seiichi Mita ,  Toru Kawashima ,  Toshimitsu Kaku

发明人： Seiichi Mita ,  Toru Kawashima ,  Toshimitsu Kaku

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

CPC分类号： G11B11/10597 ,  G11B20/10009

摘要： A signal reproducing system discriminates signals stably in the case of reproducing a signal from an optical recording medium which has coexistent recording areas with the signals recorded in different recording forms therein. Parts that constitute a reproduced signal are respectively derived by corresponding signal detectors from the optical recording medium in which a preformat area and a data area are included as the coexistent recording areas. The average potentials of VFO parts, which are respectively contained in the reproduced signal parts, are detected on the basis of the envelopes of the signal parts by a peak detecting circuit and a bottom detecting circuit. The detected average potentials are compared with a reference voltage, and the resulting difference potentials are added to the reproduced signal by an adder to bring the average potentials of the VFO parts into agreement. Further, an unwanted part of the output signal of the adder corresponding thereto is replaced by a switch with the output signal of a signal generator, which has an average potential equal to the average potential of the VFO parts brought into agreement.

摘要翻译： 信号再现系统在再现来自具有记录在不同记录形式的信号的具有共存记录区域的光记录介质的信号的情况下，稳定地鉴别信号。 构成再现信号的部件分别由来自其中包括预格式区域和数据区域的光记录介质的相应信号检测器导出为共存记录区域。 基于由峰值检测电路和底部检测电路的信号部分的包络来检测分别包含在再现信号部分中的VFO部分的平均电位。 将检测到的平均电位与参考电压进行比较，并通过加法器将所得差分电位加到再现信号上，使VFO部分的平均电位一致。 此外，与其对应的加法器的输出信号的不希望的部分由具有信号发生器的输出信号的开关代替，该信号发生器具有等于VFO部分的平均电位的平均电位。

公开(公告)号：US4521816A

公开(公告)日：1985-06-04

申请号：US405342

申请日：1982-08-05

申请人： Akihiko Kougami ,  Seiichi Mita ,  Toru Kirino ,  Shusaku Nagahara

发明人： Akihiko Kougami ,  Seiichi Mita ,  Toru Kirino ,  Shusaku Nagahara

IPC分类号： G11B5/09 ,  G11B5/035 ,  G11B20/10 ,  G11B20/14

CPC分类号： G11B20/10194 ,  G11B20/1419 ,  G11B20/1423 ,  G11B5/035

摘要： A magnetic recording method for digital signals, and more particularly to a magnetic head driving current waveform wherein digital signals to be recorded on a magnetic tape at a high density have the waveform of the head driving current shaped in order to reduce the degradation of the waveform. That is, in a case where the period of the current reversal of the driving current is long and continues for at least 1.5 times the bit period, the amplitude of the current in the rise part of the wave is made small. The driving current of this waveform has a reduced waveform degradation, and the magnetic recording at the high density becomes possible.

摘要翻译： 一种用于数字信号的磁记录方法，更具体地说，涉及磁头驱动电流波形，其中以高密度记录在磁带上的数字信号具有形成磁头驱动电流的波形，以便减小波形的劣化 。 也就是说，在驱动电流的电流反转的周期长并且持续至少比位周期的1.5倍的情况下，波的上升部分中的电流的振幅变小。 该波形的驱动电流具有降低的波形劣化，并且可以实现高密度的磁记录。

公开(公告)号：US07046745B2

公开(公告)日：2006-05-16

申请号：US09986925

申请日：2001-11-13

申请人： Seiichi Mita ,  Hideki Sawaguchi ,  Naoya Kobayashi ,  Masaharu Kondo

发明人： Seiichi Mita ,  Hideki Sawaguchi ,  Naoya Kobayashi ,  Masaharu Kondo

IPC分类号： H03D1/00 ,  H04B1/10 ,  G11B1/035

CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/10009 ,  H04L1/0054

摘要： In a data demodulating method, predetermined input data is demodulated based upon a response characteristic of the partial response class 4; the demodulated input data is discrete-filtered to thereby produce filtering data; and the filtering data is maximum likelihood-decoded to thereby produce asymmetrical response data. Further, a magnetic recording/reproducing apparatus is arranged by using this data demodulating method.

摘要翻译： 在数据解调方法中，基于部分响应等级4的响应特性来解调预定输入数据; 解调输入数据被离散滤波，从而产生滤波数据; 并且滤波数据被最大似然解码，从而产生非对称响应数据。 此外，通过使用该数据解调方法来布置磁记录/再现装置。

公开(公告)号：US06873665B2

公开(公告)日：2005-03-29

申请号：US09887328

申请日：2001-06-25

申请人： Naoya Kobayashi ,  Seiichi Mita ,  Masaharu Kondo ,  Hideki Sawaguchi ,  Takashi Moriyasu

发明人： Naoya Kobayashi ,  Seiichi Mita ,  Masaharu Kondo ,  Hideki Sawaguchi ,  Takashi Moriyasu

IPC分类号： G11B20/14 ,  G11B20/10 ,  G11B20/18 ,  H03M13/09 ,  H03M13/23 ,  H03M13/41 ,  H04L25/03 ,  H04L25/08 ,  H03D1/00 ,  H04L27/06

CPC分类号： H03M13/6331 ,  G11B20/10 ,  G11B20/18 ,  H03M13/09 ,  H03M13/41 ,  H03M13/4115 ,  H03M13/4184 ,  H03M13/6343 ,  H03M13/6502 ,  H03M13/6505 ,  H04L25/03178

摘要： A digital magnetic recording/reproducing apparatus includes an LVA (List Viterbi Algorithm) detector which produces first to nth best sequences (n>1) of a decoded result, and replaces a likelihood ratio and a path memory of the ith best sequence (i=2, 3, . . . , n) with those of the (2i−1)th best sequence when contents of path memories of the (i−1)th and ith best sequences are equal to each other and an absolute value of a difference between likelihood ratios of the (i−1)th and (2i−1)th best sequences is smaller than a decision threshold. Alternatively, the LVA detector initializes a likelihood ratio of the ith best sequence to be a likelihood ratio of the (i−1)th best sequence with a constant difference value added thereto when contents of path memories of the (i−1)th and ith best sequences are equal to each other.

摘要翻译： 一种数字磁记录/重放装置包括一个产生解码结果的第n至第n个最佳序列（n> 1）的LVA（List Viterbi Algorithm）检索器，并将第i个最佳序列（i = 2，3，...，n）与（i-1）和第i个最佳序列的路径存储器的内容彼此相等时的（2i-1）最佳序列的那些，绝对值 （i-1）和（2i-1）最佳序列的似然比之间的差异小于判定阈值。 或者，LVA检测器将第（i-1）个最佳序列的似然比初始化为第（i-1）个最佳序列的似然比，并且当第（i-1）和 最好的序列彼此相等。