公开(公告)号：US4521817A

公开(公告)日：1985-06-04

申请号：US390738

申请日：1982-06-21

申请人： Kohhei Sasamura ,  Takaro Mori

发明人： Kohhei Sasamura ,  Takaro Mori

IPC分类号： G11B5/02 ,  G11B5/027 ,  G11B5/09 ,  G11B20/02 ,  G11B20/24

CPC分类号： G11B20/02 ,  G11B20/24

摘要： In a circuit arrangement for magnetic recording apparatus having a multi-track head, a resistor network is provided so that each operational amplifier associated with each magnetic head included in the multi-track head functions as a constant-current circuit. The resistances of four resistors in the resistor network are selected so that no current flows via one resistor interposed between the output terminal of the operational amplifier and a terminal of the head in receipt of no input signal even if leakage flux emitted from adjacent head is picked up by the head. Therefore, undesirable influence due to crosstalk can be effectively prevented, providing high quality reproduction in the case of audio signal recording or low bit error rate in the case of digital recording.

摘要翻译： 在具有多轨头的磁记录装置的电路装置中，提供电阻网络，使得与包括在多轨头中的每个磁头相关联的每个运算放大器用作恒流电路。 选择电阻网络中的四个电阻器的电阻，使得即使从相邻头部发射的漏磁通被拾取，也没有电流流过运算放大器的输出端子与头部的端子之间的一个电阻器 由头。 因此，可以有效地防止由于串扰引起的不期望的影响，在数字记录的情况下在音频信号记录的情况下提供高质量再现或低位错误率。

公开(公告)号：US5638064A

公开(公告)日：1997-06-10

申请号：US500274

申请日：1995-07-10

申请人： Takaro Mori ,  Kazunari Matsui ,  Takumi Hayashiyama

发明人： Takaro Mori ,  Kazunari Matsui ,  Takumi Hayashiyama

IPC分类号： G11B20/14 ,  H03M5/14 ,  H04L25/49 ,  H03M7/00

CPC分类号： H04L25/4915 ,  H03M5/145 ,  G11B20/1426

摘要： Digital modulating method and apparatus are provided which converts m-bit data codes, in sequence, into digital modulation codes each consisting of n channel bits (n>m) to form a modulation code sequence using connection codes. Bit patterns of portions of the modulation code sequence and the connection codes are changed or additional bit patterns are inserted into the modulation code sequence so as to meet given conditions of a minimum transition interval, a maximum transition interval, and a Digital Sum Value. Demodulating method and apparatus performing a reverse modulation operation are also described.

摘要翻译： 提供了数字调制方法和装置，其将m位数据代码依次转换为每个由n个通道位（n> m）组成的数字调制代码，以使用连接代码形成调制码序列。 改变调制码序列和连接码的部分的位模式，或者将附加位模式插入到调制码序列中，以满足最小转换间隔，最大转换间隔和数字和值的给定条件。 还描述了执行逆调制操作的解调方法和装置。

公开(公告)号：US5282185A

公开(公告)日：1994-01-25

申请号：US601645

申请日：1990-10-23

申请人： Takaro Mori ,  Shigeru Nemoto

发明人： Takaro Mori ,  Shigeru Nemoto

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

CPC分类号： G11B20/10037 ,  G11B20/10009 ,  G11B20/10222 ,  G11B20/1403

摘要： An optical disk has regions in which sync signals are recorded. A data detection circuit detects data from a reproduced signal at a timing determined by a data detecting signal. A reproduced waveform of each sync signal is sampled at a first time point, and a first sample value representative thereof is generated. The reproduced waveform of each sync signal is sampled at a second time point different from the first time point, and a second sample value representative thereof is generated. The first and second sample values are compared, and a comparison signal representing a result of the comparing is generated. A phase of the data detecting signal is controlled in response to the comparison signal.

摘要翻译： 光盘具有记录同步信号的区域。 数据检测电路在由数据检测信号确定的定时检测来自再生信号的数据。 每个同步信号的再现波形在第一时间点被采样，并且生成代表其的第一采样值。 在与第一时间点不同的第二时间点对每个同步信号的再现波形进行采样，并生成代表其的第二采样值。 比较第一和第二样本值，并生成表示比较结果的比较信号。 响应于比较信号来控制数据检测信号的相位。

公开(公告)号：US4837641A

公开(公告)日：1989-06-06

申请号：US102550

申请日：1987-09-29

申请人： Takaro Mori ,  Yasuhiro Yamada

发明人： Takaro Mori ,  Yasuhiro Yamada

IPC分类号： G11B5/09 ,  G11B15/18 ,  G11B15/467 ,  G11B20/10 ,  G11B27/032 ,  G11B27/036 ,  G11B27/30

CPC分类号： G11B27/3063 ,  G11B15/1875 ,  G11B15/4672 ,  G11B20/10527 ,  G11B27/036 ,  G11B2220/90 ,  G11B2220/913 ,  G11B27/032

摘要： A rotary head type digital signal recording and reproducing apparatus plays a magnetic tape which is pre-recorded with a time division multiplexed audio signal comprising a PCM audio data and a sub-channel signal which is time division multiplexed immediately before and after the PCM audio data for each track. When carrying out an after recording of the sub-channel signal to be reproduced in a half tape speed mode, both of the rotational speed of the two magnetic heads and the tape transport speed are set identical to those at a standard tape speed mode which has a rotational speed and the tape transport speed which are twice those of the half-speed mode.

摘要翻译： 旋转头式数字信号记录和再现装置播放一个磁带，该磁带被预先记录有包含在PCM音频数据之前和之后的时分复用的PCM音频数据和子信道信号的时分复用音频信号 对于每个轨道 当以半带速度模式进行要重放的子信道信号的后记录时，两个磁头的转速和磁带传送速度两者都被设定为与标准磁带速度模式 转速和磁带传送速度是半速模式的两倍。

公开(公告)号：US4045621A

公开(公告)日：1977-08-30

申请号：US610263

申请日：1975-09-04

申请人： Isao Ohwaki ,  Kohei Sasamura ,  Teruo Muraoka ,  Takaro Mori

发明人： Isao Ohwaki ,  Kohei Sasamura ,  Teruo Muraoka ,  Takaro Mori

IPC分类号： G11B3/38 ,  G11B20/00 ,  G11B3/00 ,  G11B3/74

CPC分类号： G11B20/00992 ,  G11B3/38

摘要： A multichannel record disc recording system uses two channels of direct wave sum signals and two channels of angle-modulated wave difference signals which are multiplexed and recorded in one sound groove on a record disc. During recording, a tracing distortion compensation means imparts a reverse distortion which cancels the tracing distortion produced, with respect to the sum signals, during reproducing. Since the compensation means is in the transmission paths of the direct wave sum signals, the reverse distortion is only imparted to the direct wave sum signals. Also, phase correction signals are provided.