公开(公告)号：US5299003A

公开(公告)日：1994-03-29

申请号：US849332

申请日：1992-03-10

申请人： Atsuo Ochi ,  Masayuki Yoneyama ,  Yasuo Hamamoto ,  Akihiro Takeuchi ,  Masaaki Kobayashi ,  Haruo Ohta

发明人： Atsuo Ochi ,  Masayuki Yoneyama ,  Yasuo Hamamoto ,  Akihiro Takeuchi ,  Masaaki Kobayashi ,  Haruo Ohta

IPC分类号： H03F1/32 ,  H03G5/00 ,  H04N5/923 ,  H04N5/931 ,  H04N7/24 ,  H04N5/213

CPC分类号： H04N7/24 ,  H03F1/3241 ,  H03G5/005 ,  H04N5/923 ,  H04N5/9315

摘要： A signal processing apparatus for changing the frequency characteristics of an input signal, e.g.--a video or audio signal, allows a signal to pass through a transmission circuit in a positive time sequence and then, allows the signal to be transmitted through another transmission circuit having the same transmission characteristics in a reverse time sequence with respect to the positive time sequence. Also, while the transmission circuit is arranged to have a zero-phase characteristic, each segment of a continuous signal is processed throughout a period which is equal to at least two times a duration of an impulse response direction of the transmission circuit. Accordingly, unwanted wave errors appearing at discontinuous regions of the signals are eliminated.

摘要翻译： 用于改变例如视频或音频信号的输入信号的频率特性的信号处理装置允许信号以正时序顺序通过传输电路，然后允许信号通过具有 相对于正时序的反向时间序列具有相同的传输特性。 此外，当发送电路被布置为具有零相位特性时，连续信号的每个段在等于发送电路的脉冲响应方向的持续时间的至少两倍的周期内被处理。 因此，消除了在信号的不连续区域出现的不期望的波形误差。

公开(公告)号：US5233479A

公开(公告)日：1993-08-03

申请号：US591240

申请日：1990-10-01

申请人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

IPC分类号： G11B20/06 ,  G11B20/10 ,  H04L27/38

CPC分类号： G11B20/06 ,  G11B20/10

摘要： An apparatus for demodulating and decoding a multi-level amplitude modulation signal used to convey digital data, such as a QAM signal, having amplitude modulated carrier components differing in phase. The apparatus derives demodulated data values from that signal, and derives from average values of sets of these data values a set of compensated reference point data respectively corresponding to signal reference points of the multi-level modulation signal which are expressible as a symbol constellation in the I-Q plane. The compensated reference point data are used to obtain correct digital code values from the demodulated data, even if there is considerable distortion of the multi-level amplitude modulated signal, as is the case for such a signal when recorded and reproduced from a magnetic recording medium.

摘要翻译： 一种用于解调和解码用于传送诸如QAM信号的数字数据的多电平幅度调制信号的装置，其具有相位不同的幅度调制载波分量。 该装置从该信号导出解调的数据值，并且从这些数据值的集合的平均值中导出分别对应于多电平调制信号的信号参考点的一组补偿参考点数据，这些参考点数据可表示为 智商飞机。 补偿参考点数据用于从解调数据获得正确的数字码值，即使在多电平幅度调制信号存在相当大的失真的情况下，如在从磁记录介质记录和再现时的这种信号的情况 。

公开(公告)号：US5255127A

公开(公告)日：1993-10-19

申请号：US724888

申请日：1991-07-02

申请人： Etsuto Nakatsu ,  Hiroaki Shimazaki ,  Haruo Ohta ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Hiroaki Shimazaki ,  Haruo Ohta ,  Masaaki Kobayashi

IPC分类号： G11B20/10 ,  H03M13/39 ,  H04L1/00 ,  G11B5/09 ,  G11B20/06

CPC分类号： H04L1/0047 ,  G11B20/10009 ,  H03M13/39 ,  H04L1/0054

摘要： In transmission or recording of a digital signal by means of digital amplitude and phase modulation, particularly recording into and reproducing the same from the a magnetic recording medium, a digital amplitude/phase modulated signal to be demodulated is commonly affected by the non-linear amplitude characteristics and the effects of unwanted jitter and envelope variation. As the result, the error rate of decoded data will be increased. For compensation, the Viterbi decoding technique is employed with the use of a weighted distance value calculated by multiplying an Euclidean distance between the signal point of a reproduction signal and the datum point of each code by a positive weighting factor which is determined smaller when the code datum point is located further from the origin point of a coordinate system. Accordingly, the weighted distance of each reproduction signal point from its corresponding datum point can approximately be uniform thus ensuring less error decoding in general.

公开(公告)号：US5402272A

公开(公告)日：1995-03-28

申请号：US178623

申请日：1994-01-07

申请人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

发明人： Etsuto Nakatsu ,  Haruo Ohta ,  Masaaki Kobayashi

IPC分类号： G11B20/10 ,  G11B5/09 ,  G11B5/02

CPC分类号： G11B20/10

摘要： A digital signal magnetic recording/reproducing apparatus subjects a digital signal to a digital amplitude phase shift keying and records and reproduces the modulated signal thus obtained on a magnetic recording medium. Use of the digital amplitude phase shift keying technique makes it possible to remove the direct-current component in the recording signals, and to improve the utilization efficiency of the recording frequency band, thus making high density recording possible. In addition, since a plurality of modulated signals are frequency-multiplexed and recorded, almost the entire frequency band recordable on a magnetic recording medium can be utilized, resulting in an increase in recording density. Further in addition, a pilot signal produced by frequency-converting a carrier is frequency-multiplexed with a modulated signal and recorded and reproduced and the carrier is reproduced from the reproduced pilot signal, so that a redundant part for reproducing the carrier is not necessary.

摘要翻译： 数字信号磁记录/再现装置使数字信号进行数字幅度相移键控，并记录并再现由磁记录介质获得的调制信号。 使用数字幅度相移键控技术可以消除记录信号中的直流分量，并提高记录频带的利用效率，从而使得高密度记录成为可能。 此外，由于多个调制信号被频率复用和记录，所以可以利用可记录在磁记录介质上的几乎整个频带，导致记录密度的增加。 此外，通过对载波进行频率转换而产生的导频信号与调制信号进行频率复用并被记录和再现，并且从再现的导频信号再现载波，从而不需要用于再现载波的冗余部分。

公开(公告)号：US5991108A

公开(公告)日：1999-11-23

申请号：US804592

申请日：1997-02-24

申请人： Haruo Ohta

发明人： Haruo Ohta

IPC分类号： G11B20/10 ,  G11B5/09

CPC分类号： G11B20/10009

摘要： In a recording and reproducing apparatus having a simultaneous reproducing function, an adaptive filter outputs a pseudo crosstalk signal which approximates to frequency characteristics of crosstalk components leaking from recording data into a reproduced signal, and a subtractor subtracts the pseudo crosstalk signal from the reproduced signal, thereby canceling the crosstalk components

摘要翻译： 在具有同时再现功能的记录和再现装置中，自适应滤波器输出近似于从记录数据泄漏到再现信号中的串扰分量的频率特性的伪串扰信号，并且减法器从再现信号中减去伪串扰信号， 从而消除串扰分量

公开(公告)号：US5265125A

公开(公告)日：1993-11-23

申请号：US791533

申请日：1991-11-14

申请人： Haruo Ohta

发明人： Haruo Ohta

IPC分类号： G11B20/10 ,  H04L25/06 ,  H04L25/497 ,  H04L27/01

CPC分类号： G11B20/10009 ,  H04L25/061 ,  H04L25/066 ,  H04L25/497

摘要： A signal detection apparatus detects original information from a PCM signal transmitted through a communication channel or reproduced from a recording medium. The apparatus includes: a first equalizer for equalizing the PCM signal so as to decrease intersymbol interference, a clock regenerator for regenerating a clock signal synchronized with a timing of the digital information from an output of the first equalizer; an amplitude detector for detecting an amplitude from the output of the first equalizer and the clock signal; a second equalizer for equalizing the output of the first equalizer to a partial-response equalized signal, and a detecting circuit for detecting the original digital information at a clock timing of the clock signal from the partial-response equalized signal. Accordingly, without being influenced by the amplitude fluctuations of the signal, the original digital information can be detected at a low bit error rate.

摘要翻译： 信号检测装置从通过通信信道发送的PCM信号或从记录介质再现的PCM信号检测原始信息。 该装置包括：用于均衡PCM信号以减少符号间干扰的第一均衡器，用于从第一均衡器的输出再生与数字信息的定时同步的时钟信号的时钟再生器; 振幅检测器，用于从第一均衡器的输出和时钟信号中检测振幅; 第二均衡器，用于将第一均衡器的输出均衡到部分响应均衡信号;以及检测电路，用于在来自部分响应均衡信号的时钟信号的时钟定时处检测原始数字信息。 因此，在不受信号的振幅波动的影响的情况下，可以以低误码率检测原始数字信息。

公开(公告)号：US5051614A

公开(公告)日：1991-09-24

申请号：US356322

申请日：1989-05-23

申请人： Haruo Ohta

发明人： Haruo Ohta

IPC分类号： H04N5/94 ,  G11B20/06 ,  G11B20/10 ,  G11B20/18

CPC分类号： G11B20/18 ,  G11B20/10009

摘要： A dropout detecting apparatus comprises a phase conversion circuit for converting an input signal into two signals which are different in phase by .pi./2 from each other, two squaring circuits for obtaining squares of the two signals respectively, an addition circuit for adding the two square signals, and an amplitude comparator for comparing the amplitude of an output signal of the addition circuit with a reference value. The output signal of the addition circuit becomes the square of the envelope of the input signal regardless of the phase of the input signal.

摘要翻译： 一种压差检测装置，包括：相位转换电路，用于将输入信号转换为相互不同的π/ 2的两个信号，分别获得两个信号的平方的两个平方电路;加法电路， 信号和用于将加法电路的输出信号的振幅与参考值进行比较的幅度比较器。 加法电路的输出信号成为输入信号的包络的平方，与输入信号的相位无关。

公开(公告)号：US4849826A

公开(公告)日：1989-07-18

申请号：US119069

申请日：1987-11-10

申请人： Haruo Ohta

发明人： Haruo Ohta

IPC分类号： H03G5/00 ,  H04N5/923

CPC分类号： H03G5/005 ,  H04N5/923

摘要： A digital non-linear pre-emphasis/de-emphasis apparatus is arranged such that a frequency band of a high-pass filter for extracting a high frequency component signal of an input signal is varied according to the input signal by feeding back the output signal of the high-pass filter through a first non-linear input/output circuit. The first non-linear input/output circuit multiplies the output signal of the high-pass filter by a coefficient which is a function of the output signal of the high-pass filter to obtain a feedback signal. The output signal of the high-pass filter is also applied to a second non-linear input/output circuit which multiplies the output signal of the high-pass filter by a coefficient which is a function of the output signal of the high-pass filter. An output signal of the second non-linear input/output circuit is mixed with the input signal by an operation circuit to obtain an output signal which is non-linearly emphasized or de-emphasized.

摘要翻译： 数字非线性预加重/去加重装置被布置成使得用于提取输入信号的高频分量信号的高通滤波器的频带根据输入信号而变化，通过反馈输出信号 的高通滤波器通过第一非线性输入/输出电路。 第一非线性输入/输出电路将高通滤波器的输出信号乘以作为高通滤波器的输出信号的函数的系数，以获得反馈信号。 高通滤波器的输出信号也被施加到第二非线性输入/输出电路，该第二非线性输入/输出电路将高通滤波器的输出信号乘以高通滤波器的输出信号的函数的系数 。 第二非线性输入/输出电路的输出信号通过运算电路与输入信号混合，以获得非线性强调或去强调的输出信号。

公开(公告)号：US20060221711A1

公开(公告)日：2006-10-05

申请号：US10554103

申请日：2003-12-11

申请人： Haruo Ohta ,  Takeshi Ohtsuka

发明人： Haruo Ohta ,  Takeshi Ohtsuka

IPC分类号： G11C7/10

CPC分类号： G06K7/0034 ,  G06K19/07741 ,  G06K19/07743

摘要： A semiconductor memory device according to the present invention comprises a hosing including a card bus connector for connection to a host device and having a PC card shape having the thickness of 5.0 mm, four SD memory cards (R: Registered trade mark) housed in the housing and a control circuit for controlling transmission/reception of a signal between the card bus connector and the respective SD memory cards (R: Registered trade mark). The semiconductor memory device is suitably used as a recording medium of the host device for which a higher data transfer rate and a larger memory capacity are demanded. Further, a semiconductor memory device, which is attachable and detachable relative to the host device and thereby portable, and relatively inexpensively obtainable, can be provided, and is directly insertable into a laptop personal computer to be used.

摘要翻译： 根据本发明的半导体存储器件包括一个包括用于连接到主机设备并且具有5.0mm厚度的PC卡形状的卡总线连接器的连接器，四个SD存储卡（R：注册商标） 壳体和控制电路，用于控制卡总线连接器和相应的SD存储卡之间的信号的发送/接收（R：注册商标）。 半导体存储器件适合用作要求更高数据传输速率和更大存储容量的主机设备的记录介质。 此外，可以提供相对于主机设备可附接和可拆卸并且相对便宜的半导体存储器件，并且相对便宜地可获得，并且可直接插入待使用的笔记本个人计算机中。

公开(公告)号：USRE39029E1

公开(公告)日：2006-03-21

申请号：US10349954

申请日：2003-01-24

申请人： Kouhei Baba ,  Haruo Ohta ,  Hideaki Mukae ,  Jun Takeuchi ,  Haruo Isaka

发明人： Kouhei Baba ,  Haruo Ohta ,  Hideaki Mukae ,  Jun Takeuchi ,  Haruo Isaka

IPC分类号： H04N5/93

CPC分类号： G11B5/53 ,  G11B5/0086 ,  G11B5/534 ,  G11B15/125 ,  G11B15/4675

摘要： A magnetic recording/reproducing apparatus is provided in which among diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are disposed adjacently to each other. The recording head is disposed so as to precede by two tracks the erasing head with respect to a direction of cylinder rotation, when insert-editing, using a reproduced signal obtained by the recording head, erase and record timing setting and head tracking are performed and an erasing current is not applied during the reproduction by the recording head. The reproducing heads are disposed so as to be angularly apart by about 90 degrees from the recording and erasing heads, and a rotary transformer for reproduction is applied with a shield measure and then, formed as a core independently at an upper portion of the cylinder. In addition, more narrow tracks are compatibly reproduced by the recording head.

摘要翻译： 提供了一种磁记录/再现装置，其中在径向相对设置的头之间，相邻通道的记录头和擦除头彼此相邻设置。 记录头相对于气缸旋转方向设置在两个轨道之前，即擦除头，当使用由记录头获得的再现信号进行插入编辑时，执行擦除和记录定时设置和磁头跟踪， 在记录头的再现期间不施加擦除电流。 再现头被设置成与记录和擦除头成角度地分开约90度，并且用于再现的旋转变压器被施加屏蔽测量，然后在缸的上部独立地形成为芯。 此外，由记录头兼容地再现更窄的轨道。