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1. 发明授权

US4700241A Apparatus for recording and reproducing digital signals 失效
标题翻译：用于记录和再现数字信号的装置
公开(公告)号：US4700241A
公开(公告)日：1987-10-13
申请号：US843722
申请日：1986-03-25
申请人： Syuhei Yasuda , Hiroshi Ii , Taizo Sasada
发明人： Syuhei Yasuda , Hiroshi Ii , Taizo Sasada
IPC分类号： G11B20/14 , G11B5/008 , G11B20/10 , G11B20/22 , H03K5/00 , H04L7/033 , G11B5/09
CPC分类号： G11B20/22 , G11B20/10009 , G11B20/10527 , G11B5/00817 , H04L7/0334
摘要： An apparatus for recording and reproducing digital signals includes a detector for detecting and producing a phase data signal of a sampled point of the digital signal, a first comparator for comparing a first phase data signal at one sampling point and a second phase data signal at one previous sampling point, a second comparator for comparing a predetermined value with a phase difference between the second phase data and newly detected phase data, a condition detecting means, utilizing the results of the first and second comparators, for detecting whether two adjacent sampling points are within a reference phase period, and sampling pulse generating means for generating one sampling pulse when the two sampling points are separated by a distance equal to the reference phase period, two sampling pulses when the distance is greater than the reference phase period; and no sampling pulse when the distance is less than the reference phase period.
摘要翻译：一种用于记录和再现数字信号的装置包括用于检测和产生数字信号的采样点的相位数据信号的检测器，用于将一个采样点处的第一相位数据信号和一个采样点的第二相位数据信号进行比较的第一比较器先前采样点，用于将预定值与第二相位数据与新检测到的相位数据之间的相位差进行比较的第二比较器，利用第一和第二比较器的结果检测两个相邻采样点是否为以及采样脉冲发生装置，用于当两个采样点被分离距离等于参考相位周期的距离时产生一个采样脉冲，当距离大于参考相位周期时，产生两个采样脉冲; 当距离小于参考相位周期时，无采样脉冲。

2. 发明授权

US5311375A Recording head arrangement for video signal recording and/or reproducing device 失效
标题翻译：用于视频信号记录和/或再现装置的记录头装置
公开(公告)号：US5311375A
公开(公告)日：1994-05-10
申请号：US844912
申请日：1992-03-04
申请人： Yoshiyuki Ikushima , Taizo Sasada , Toshiaki Tabuchi
发明人： Yoshiyuki Ikushima , Taizo Sasada , Toshiaki Tabuchi
IPC分类号： G11B5/008 , G11B5/027 , H04N5/7826 , H04N7/015 , H04N5/78 , G11B15/14
CPC分类号： H04N5/78266 , G11B5/0086
摘要： A recording head arrangement is disclosed which may be employed in a video signal recording and/or reproducing device in which a video tape is helically wound on a drum carrying recording heads for recording and/or reproducing a video signal. The video signal is divided for representing upper and lower half images on a screen. The recording head arrangement includes first and second heads mounted on the drum adjacent each other. The first and second heads have the same azimuth angle which is inclined in a first direction with respect to a direction perpendicular to the head advancing direction. Third and fourth heads are mounted on the drum 180 degrees spaced from the first and second heads, respectively. The third and fourth heads have the same azimuth angle which is inclined in a second direction, opposite to the first direction. The first and second heads are scanned to form first and second tracks spaced apart by approximately one track width for recording and/or reproducing the first half image, and the third and fourth heads are scanned to form third and fourth tracks spaced apart by approximately one track width and in an interlaced manner with the first and second tracks for recording and/or reproducing the second half image.
摘要翻译：公开了可以用于视频信号记录和/或再现装置的记录头装置，其中录像带被螺旋地缠绕在承载用于记录和/或再现视频信号的记录头的鼓上。视频信号被分割以表示屏幕上的上半部和下半部分图像。记录头装置包括彼此相邻地安装在滚筒上的第一和第二头部。第一和第二头具有相对于垂直于头前进方向的方向在第一方向上倾斜的方位角。第三和第四头分别安装在与第一和第二头部间隔开180度的滚筒上。第三和第四头具有与第一方向相反的第二方向倾斜的相同的方位角。扫描第一和第二磁头以形成间隔大约一个磁道宽度的第一和第二磁道，用于记录和/或再现第一半图像，并且扫描第三和第四磁头以形成间隔开大约一个的第三和第四磁道轨道宽度和隔行扫描方式与第一和第二轨迹相互记录和/或再现第二半图像。

3. 发明授权

US5293280A Magnetic recording and reproduction apparatus for data processing unit and magnetic tape for use in such apparatus 失效
标题翻译：用于数据处理单元的磁记录和再现设备以及用于这种设备的磁带
公开(公告)号：US5293280A
公开(公告)日：1994-03-08
申请号：US739218
申请日：1991-08-01
申请人： Toshio Ishikawa , Shigeo Terashima , Taizo Sasada
发明人： Toshio Ishikawa , Shigeo Terashima , Taizo Sasada
IPC分类号： G11B5/09 , G11B5/008 , G11B15/00 , G11B15/087 , G11B20/10 , G11B20/12 , G11B27/10 , G11B27/30 , G11B15/48
CPC分类号： G11B15/087 , G11B15/005 , G11B20/10 , G11B20/1202 , G11B27/107 , G11B27/3027 , G11B27/3063 , G11B5/0083 , G11B2020/10592 , G11B2020/10888 , G11B2220/90 , G11B2220/913
摘要： Disclosed are a magnetic recording and reproduction apparatus for a data processing unit, which includes a plurality of magnetic heads formed integrally by a thin-film forming technology, and a magnetic tape. A magnetic tape has a plurality of recording tracks corresponding to a plurality of independent data. The recording tracks are arranged in parallel to a moving direction of the magnetic tape and share the same starting position. A plurality of magnetic heads are arranged in parallel to a width direction of the magnetic tape to correspond to the recording tracks in a one-to-one correspondence, and are fixed at the starting position of the recording tracks. The magnetic tape is moved in a direction in which the starting position is away from the magnetic heads for data recording onto the magnetic tape and for data reproduction from the magnetic tape. Further, the magnetic tape is controlled to automatically and immediately move in an opposite direction to the previous direction until the starting position reaches the position of the magnetic heads in response to each of the end of the data recording and the end of the data reproduction. Thus, the starting position of the recording tracks is the same, i.e. at the position of magnetic heads upon the start of data recording and the start of data reproduction.
摘要翻译：公开了一种用于数据处理单元的磁记录和再现装置，其包括通过薄膜形成技术一体地形成的多个磁头和磁带。磁带具有对应于多个独立数据的多个记录道。记录轨道与磁带的移动方向平行地布置，并且共享相同的起始位置。多个磁头与磁带的宽度方向平行布置，以一一对应的方式对应于记录磁道，并固定在记录磁道的起始位置。磁带沿起始位置远离磁头的方向移动，用于数据记录到磁带上，并从磁带进行数据再现。此外，磁带被控制以自动地并且立即沿与先前方向相反的方向移动，直到起始位置响应于数据记录的每个结束和数据再现的结束而到达磁头的位置。因此，记录磁迹的起始位置是相同的，即在开始数据记录和开始数据再现时在磁头的位置。

4. 发明授权

US4910517A Digital data detector 失效
标题翻译：数字数据检测器
公开(公告)号：US4910517A
公开(公告)日：1990-03-20
申请号：US221871
申请日：1988-07-20
申请人： Hitoshi Takeuchi , Taizo Sasada
发明人： Hitoshi Takeuchi , Taizo Sasada
IPC分类号： G11B20/10 , H04L7/02
CPC分类号： G11B20/10203 , G11B20/10009 , G11B20/10037 , G11B20/10527
摘要： A digital modulation signal is sampled by an A/D converter in a predetermined cycle. A phase interval P between a zero level crossing and the current sampling point using sampling data S.sub.i+1 at the current sampling point and sampling data S.sub.i at a sampling point which is located one point before the current sampling point. A phase P.sub.i+1 of the current sampling point is found using the phase interval P, a phase P.sub.i of the sampling point which is located one point before the current sampling point, a phase P.sub.i -1 of a sampling point which is located two points before the current sampling point and a phase P.sub.i-2 of a sampling point which is located three points before the current sampling point. A clock signal is detected using the phases P.sub.i+1 and P.sub.i. Digital data is detected using the phase interval P, the phase P.sub.i+1 and the sampling data S.sub.i at the sampling point which is located one point before the current sampling point.

5. 发明授权

US4812987A Wave shaping circuit 失效
标题翻译：波形整形电路
公开(公告)号：US4812987A
公开(公告)日：1989-03-14
申请号：US795231
申请日：1985-11-05
申请人： Chiaki Yamawaki , Taizo Sasada , Tetsuo Iwaki , Katsubumi Koyanagi
发明人： Chiaki Yamawaki , Taizo Sasada , Tetsuo Iwaki , Katsubumi Koyanagi
IPC分类号： G11B20/10 , G11B20/14 , G11B20/22 , G06F7/38 , H03B1/00
CPC分类号： G11B20/10009 , G11B20/10527 , G11B20/1426
摘要： A wave shaping circuit includes a digital sampling circuit for sampling an input signal and producing a digital signal. The sampled signal is detected by a sign detector for detecting whether it is positive or negative. A unit difference generator is provided for generating a unit difference which is equal to a difference increased, during one sampling cycle, in a positive or negative direction as detected by the sign detector. A register is provided for storing a summed difference obtained in the previous sampling cycle. The summed difference is multiplied by a predetermined coefficient which is between 0 and 1 so that the product changes exponentially. A first adder is provided for adding the summed difference multiplied by the coefficient with the unit difference. The added result is stored in the register. A second adder is provided for adding the sampled input signal with the summed signal stored in the register, and producing a corrected signal.
摘要翻译：波形整形电路包括用于对输入信号进行采样并产生数字信号的数字采样电路。采样信号由符号检测器检测，用于检测其是正还是负。提供了一个单位差分发生器，用于产生一个单位差值，该单位差值等于在一个采样周期期间在由符号检测器检测到的正或负方向上增加的差值。提供了一个寄存器，用于存储在先前采样周期中获得的总和差。将总和差乘以0和1之间的预定系数，使得乘积呈指数变化。第一加法器用于将乘以系数的求和差与单位差相加。添加的结果存储在寄存器中。提供第二加法器，用于将采样的输入信号与存储在寄存器中的求和信号相加，并产生校正信号。

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