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公开(公告)号：EP1026664A3
公开(公告)日：2006-08-16
申请号：EP00200144.4
申请日：1995-10-17
发明人： Suzuki, Kouhei , Ohta, Haruo , Mukae, Hideaki , Takeuchi, Jun , Isaka, Haruo
IPC分类号： G11B5/53
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 out of diametrically oppositely disposed heads, a recording head and an erasing head of a same channel are adjacently disposed to each other, the recording head is disposed so as to precede the erasing head with respect to a direction of cylinder rotation and to be behind by two tracks on a tape pattern therefrom, and 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 a to be angularly apart about 90 degrees from the recording and erasing heads, and a rotary transformer for the reproduction use is applied with the shield measure and then, formed as a core independently at a upper portion of the cylinder. In addition, further narrow tracks are compatibly reproduced by the recording head.
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公开(公告)号：EP0708436B1
公开(公告)日：2001-03-21
申请号：EP95307354.1
申请日：1995-10-17
发明人： Suzuki, Kouhei , Ohta, Haruo , Mukae, Hideaki , Takeuchi, Jun , Isaka, Hurao
CPC分类号： G11B5/53 , G11B5/0086 , G11B5/534 , G11B15/125 , G11B15/4675
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公开(公告)号：EP0794529A2
公开(公告)日：1997-09-10
申请号：EP97103525.8
申请日：1997-03-04
发明人： Ohta, Haruo
IPC分类号： G11B20/10
CPC分类号： G11B20/10009
摘要： In a recording and reproducing apparatus having a simultaneous reproducing function, an adaptive filter (32) outputs a pseudo crosstalk signal which approximates to frequency characteristics of crosstalk components leaking from recording data into a reproduced signal, and a subtractor (8) subtracts the pseudo crosstalk signal from the reproduced signal, thereby cancelling the crosstalk components.
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公开(公告)号：EP0465428A3
公开(公告)日：1994-07-20
申请号：EP91810515.6
申请日：1991-07-02
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 nonlinear 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.
摘要翻译： 在通过数字幅度和相位调制的数字信号的传输或记录中，特别是从磁记录介质中记录和再现数字信号，被解调的数字幅度/相位调制信号通常受非线性幅度特性的影响， 不需要的抖动和包络变化的影响。 结果，解码数据的错误率将会增加。 为了补偿，使用维特比解码技术，使用加权距离值，该加权距离值是通过将再现信号的信号点与每个代码的基准点之间的欧几里得距离乘以一个正的加权因子，该正的加权因子在代码 基准点位于距坐标系原点更远处。 因此，每个再现信号点与其对应的基准点的加权距离可以近似均匀，从而确保一般较少的错误解码。
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公开(公告)号：EP0503891A3
公开(公告)日：1993-03-03
申请号：EP92302023.4
申请日：1992-03-10
发明人： Ochi, Atsuo , Yoneyama, Masayuki , Hamamoto, Yasuo , Takeuchi, Akihiro , Kobayashi, Masaaki , Ohta, Haruo
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 audio or video signal allows a signal to pass a transmission circuit (11) in a positive time sequence and then, transmit through another transmission circuit (14,15) having the same transmission characteristic in a reverse time sequence to the positive time sequence by appropriate writing to and reading from memory circuit (12,13,16,17). Also, while atransmission 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 duration of the transmission circuit. Hence, unwanted waveform errors appearing at discontinuous regions of the signal will be eliminated.
摘要翻译： 一种用于改变音频或视频信号的频率特性的信号处理装置允许信号以正时间序列通过发送电路（11），然后通过具有相同发送特性的另一发送电路（14,15）发送 通过适当地向存储器电路（12,13,16,17）写入和读出而与正时间序列相反的时间序列。 而且，尽管传输电路被设置为具有零相位特性，但是连续信号的每个分段在整个等于传输电路的脉冲响应持续时间的持续时间的至少两倍的时间段内被处理。 因此，出现在信号的不连续区域的不需要的波形误差将被消除。
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公开(公告)号：EP1045545A2
公开(公告)日：2000-10-18
申请号：EP00107938.3
申请日：2000-04-14
发明人： Ohta, Haruo , Katoh, Yoshikazu
IPC分类号： H04L7/033
CPC分类号： H04L7/0062 , G11B20/10009 , G11B20/10037 , G11B20/1403 , H03L7/091 , H04L1/0054 , H04L1/206 , H04L7/0083
摘要： A reproduction signal (10) is processed in an AD converter (4) and an equalizer (16) to be a decoder input signal (12). The decoder input signal (12) is used to calculate a phase error signal (25) and a quality judgement signal (26). A phase-frequency error detection circuit (22) retains a sign of the phase error signal (25) obtained when the quality judgement signal (26) is changed in quality from "good" to "bad". The phase-frequency error detection circuit (22) then outputs, as a phase-frequency error signal (27), the phase error signal (25) when the signal quality is "good", and a given value corresponding to the retained sign when the signal quality is "bad". A voltage controlled oscillator (9) generates a recovered clock signal (11) whose frequency is based on the oscillation control signal (15) generated by the phase-frequency error signal (27).
摘要翻译： 在AD转换器（4）和均衡器（16）中处理再现信号（10）作为解码器输入信号（12）。 解码器输入信号（12）用于计算相位误差信号（25）和质量判断信号（26）。 相位频率误差检测电路（22）保持质量判定信号（26）从“良好”变为“差”时获得的相位误差信号（25）的符号。 当信号质量为“良好”时，相位误差检测电路（22）作为相位误差信号（27）输出相位误差信号（25），与 信号质量“坏”。 压控振荡器（9）产生其频率基于由相位频率误差信号（27）产生的振荡控制信号（15）的恢复时钟信号（11）。
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公开(公告)号：EP0604123B1
公开(公告)日：1999-06-02
申请号：EP93310178.4
申请日：1993-12-16
发明人： Ohta, Haruo , Hiroaki, Shimazaki
CPC分类号： H04N21/236 , G11B5/0086 , G11B5/09 , G11B15/087 , G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/12 , H04N19/13 , H04N19/60 , H04N19/91 , H04N21/434
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公开(公告)号：EP0708436A2
公开(公告)日：1996-04-24
申请号：EP95307354.1
申请日：1995-10-17
发明人： Suzuki, Kouhei , Ohta, Haruo , Mukae, Hideaki , Takeuchi, Jun , Isaka, Hurao
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 out of diametrically oppositely disposed heads, a recording head (1,4) and an erasing head (2,5) of a same channel are adjacently disposed to each other, the recording head (1,4) is disposed so as to precede the erasing head with respect to a direction of cylinder rotation and to be behind by two tracks on a tape pattern therefrom, and 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 (3,6) are disposed so as to be angularly apart about 90 degrees from the recording and erasing heads, and a rotary transformer for the reproduction use is applied with the shield measure and then, formed as a core independently at a upper portion of the cylinder. In addition, further narrow tracks are compatibly reproduced by the recording head.
摘要翻译： 提供了一种磁记录/重放装置，其中在径向相对设置的头中，相同通道的记录头（1,4）和擦除头（2,5）彼此相邻设置，记录头（1 ，4）相对于圆柱体旋转方向设置在擦除头之前，并且从其上的磁带图案后面两个磁道后面，并且当使用由记录头获得的再现信号进行插入编辑时，擦除 并且记录定时设置和头部跟踪被执行并且在记录头的再现期间不施加擦除电流。 再现磁头（3,6）被设置成与记录和擦除磁头成约90度的角度分开，并且用于再现用途的旋转变压器被施加屏蔽措施，然后独立地形成为磁芯 圆筒的上部。 另外，由记录头兼容地再现更窄的轨道。
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公开(公告)号：EP0267786B1
公开(公告)日：1995-01-25
申请号：EP87309965.9
申请日：1987-11-11
发明人： Ohta, Haruo
IPC分类号： H04N5/21
CPC分类号： H04N5/21
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公开(公告)号：EP0300633A3
公开(公告)日：1991-12-27
申请号：EP88306100.4
申请日：1988-07-05
发明人： Ohta, Haruo , Matsumota, Tokikazu
IPC分类号： H04N5/95
CPC分类号： H04N5/95
摘要： A disclosed time base corrector comprises a clock generater (107) for generating a clock signal whose period is fixed, an analog-to-digital converter (103) for sampling amplitude values of an input analog signal having a time base error at sampling points given by the clock signal, an adaptive interpolation filter (104) for interpolating a correct amplitude value at a resampling indicated by a resampling position signal, a resampling position signal producing circuit (102) for detecting the time base error and producing from the detected error the resampling position signal, and a digital-to-analog converter (106) for converting the interpolated amplitude values to an analog signal which has no time base errors. The time base correction is implemented by pure digital signal processing without any analog signal processing. The time base corrector does not use such a clock signal that has time base fluctuations.
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