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1. 发明授权

US5111151A Digital phase locked loop system 失效
标题翻译：数字锁相环系统
公开(公告)号：US5111151A
公开(公告)日：1992-05-05
申请号：US424697
申请日：1989-10-20
申请人： Hiroshi Ii
发明人： Hiroshi Ii
IPC分类号： H03L7/06 , G11B20/14 , H03L7/099 , H04L7/033
CPC分类号： H03L7/0992 , G11B20/1403
摘要： A digital phase locked loop system uses a clock signal from an oscillator which is frequency-divided by a frequency divider, thereby causing a phase locked loop clock signal locked to the input signal being produced. At this time, the phase difference between the input signal and the phase locked loop clock signal is computed by a counter. Then, by setting a frequency dividing ratio on the basis of the computed figure, the phase locked loop clock signal from the frequency divider is locked to the input signal. Furthermore, to correspond to fluctuation when the input signal is digitally pulse-width modulated, the pulse width of the input signal is computed by counter on the basis of the clock pulse. The computed figures are converted to the values which match the minimum repeatable frequency of the input signal. After the frequency dividing ration correspolnding to the phase difference is set for the frequency divider, such a frequency dividing ratio can coincide the phase of the input signal and the phase of the phase locked loop clock signal in accordance with the converted figures corresponding to the frequency of the input signal. Namely, such a digital phase locked loop system as described above can be of a simplified construction and can produce the phase locked loop clock signal locked to the input signal with good characteristics, even with a wide range of fluctuations in the input signal.
摘要翻译：数字锁相环系统使用由分频器分频的振荡器的时钟信号，从而导致锁定到输入信号被产生的锁相环时钟信号。此时，由计数器计算输入信号和锁相环时钟信号之间的相位差。然后，通过基于计算出的图来设定分频比，来自分频器的锁相环时钟信号被锁定到输入信号。此外，为了对应于输入信号被数字脉宽调制的波动，输入信号的脉冲宽度由计数器基于时钟脉冲计算。计算的图形被转换成与输入信号的最小可重复频率相匹配的值。在对分频器设定分频比相对于相位差之后，这样的分频比可以根据对应于频率的转换数字与输入信号的相位和锁相环时钟信号的相位一致的输入信号。即，如上所述的这种数字锁相环系统可以是简化的结构，并且即使在输入信号的波动范围较宽的情况下也可以产生锁定到具有良好特性的输入信号的锁相环时钟信号。

2. 发明授权

US4845574A Apparatus for recording and reproducing digital signals on magnetic tape 失效
标题翻译：用于在磁带上记录和再现数字信号的装置
公开(公告)号：US4845574A
公开(公告)日：1989-07-04
申请号：US875711
申请日：1986-06-18
申请人： Hiroshi Ii , Katsubumi Koyanagi , Syuhei Yasuda
发明人： Hiroshi Ii , Katsubumi Koyanagi , Syuhei Yasuda
IPC分类号： G11B20/14 , G11B20/10 , G11B20/22
CPC分类号： G11B20/10009 , G11B20/225
摘要： An apparatus for recording and reproducing a digital data signal carrying digital information at each periodically appearing reference "P1" phase includes a detector for detecting and producing a phase data signal at each sampling point. Two subsequently sampled phase data are stored in latches for use of the digital data signal by three signal comparators. The first comparator compares the first sampled phase data signal and the second sampled phase data signal. The second comparator compares the first sampled phase data signal with a predetermined value, and the third comparator compares the second sampled phase data signal with the same predetermined value. Utilizing the outputs of the three comparators, a phase condition detector detects whether or not a reference phase is contained between two subsequent sampling points. A detection pulse generator is provided which generates a data detection pulse when the phase condition detector detects the reference phase.
摘要翻译：用于在每个周期性出现的参考“P1”阶段记录和再现携带数字信息的数字数据信号的装置包括用于在每个采样点检测和产生相位数据信号的检测器。两个随后采样的相位数据被存储在锁存器中以供三个信号比较器使用数字数据信号。第一比较器比较第一采样相位数据信号和第二采样相位数据信号。第二比较器将第一采样相位数据信号与预定值进行比较，并且第三比较器将第二采样相位数据信号与相同的预定值进行比较。利用三个比较器的输出，相位条件检测器检测在两个后续采样点之间是否包含参考相位。提供检测脉冲发生器，当相位条件检测器检测到参考相位时，产生数据检测脉冲。

3. 发明授权

US5209699A Magnetic drive device 失效
标题翻译：磁力驱动装置
公开(公告)号：US5209699A
公开(公告)日：1993-05-11
申请号：US838696
申请日：1992-02-21
申请人： Taisaku Hashimoto , Shigemi Miki , Hiroshi Ii , Ryuji Sugimoto
发明人： Taisaku Hashimoto , Shigemi Miki , Hiroshi Ii , Ryuji Sugimoto
IPC分类号： B25J9/04 , B25J9/10 , F16C39/06 , H01L21/687 , H02K5/128 , H02K7/09 , H02K49/10
CPC分类号： F16C32/044 , B25J9/042 , H01L21/68707 , H02K49/106 , H02K7/09 , H02K5/128 , Y10T464/30
摘要： A magnetic drive device comprises a hollow cylindrical outer rotor, an inner rotor inserted in the outer rotor so as to proejct at least at one end thereof beyond an end of the outer rotor and supported rotatably relative to the outer rotor, two magnetic bearings arranged around the outer rotor and spaced apart axially thereof for holding the outer rotor radially thereof, a first magnetic coupling having a drive portion disposed around the outer rotor for transmitting a torque to the outer rotor, and a second magnetic coupling having a drive portion disposed around the inner rotor at a portion thereof projecting beyond the end of the outer rotor for transmitting a torque to the inner rotor.

4. 发明授权

US5138501A Magnetic recorder/reproducer for recording digital signal on a plurality of tracks of magnetic recording media and reproducing the same 失效
标题翻译：用于记录数字信号的磁记录器/复制器对磁记录介质的轨迹进行多次重现
公开(公告)号：US5138501A
公开(公告)日：1992-08-11
申请号：US493347
申请日：1990-03-14
申请人： Hiroshi Ii , Yukihiko Haikawa
发明人： Hiroshi Ii , Yukihiko Haikawa
IPC分类号： H04N5/92 , G11B5/008 , G11B5/09 , G11B15/18 , G11B20/10 , G11B20/12 , G11B27/10 , H04N5/926 , H04N5/937
CPC分类号： H04N5/937 , G11B15/1875 , G11B20/10 , G11B27/107 , G11B5/0086 , G11B5/09 , H04N5/926 , G11B2220/90 , G11B2220/913
摘要： A magnetic recording and reproducing apparatus for recording digital signals of a plurality of channels on tracks on magnetic recording medium and reproducing the same includes an A/D converter for converting analog video signals to digital signals, a signal dividing circuit for dividing the digital signals into first and second digital signals having first and second bit numbers for each channel, a signal permuting circuit for permuting the first and second digital signals of the same channel so as to be recorded on different tracks separately, a magnetic head for recording the permuted first and second digital signals on the different tracks and separately reproducing the same, a signal generating circuit for generating digital signals having a predetermined bit number based on the reproduced first and second digital signals, and a D/A converter for converting generated digital signals into analog signals. The externally applied digital signals are divided into signals of a higher and lower bit groups by the signal dividing circuit. The divided higher and lower bit group signals are permuted and recorded on the separate tracks. The recorded higher and lower bit group signals are separately reproduced. The separately reproduced higher and lower bit group signals are selected by the signal generating circuit, permuted once again and outputted as the original digital signals. The digital signals are converted into analog signals and supplied to other video equipments.

5. 发明授权

US5121264A Method and apparatus for reproduction of magnetic tape by using rotary drum heads 失效
标题翻译：使用旋转鼓头再生磁带的方法和装置
公开(公告)号：US5121264A
公开(公告)日：1992-06-09
申请号：US347255
申请日：1989-05-04
申请人： Hiroshi Ii
发明人： Hiroshi Ii
IPC分类号： G11B5/008 , G11B5/09 , G11B15/14 , H04N5/7826
CPC分类号： G11B15/14 , G11B5/0086 , G11B5/09 , H04N5/78263
摘要： Two magnetic heads having different azimuth angles are mounted spaced from each other on a cylindrical rotary drum. Data is recorded on a magnetic tape using of the magnetic heads. On the magnetic tape, one track is formed by one of the magnetic heads and another (second) track is formed by another magnetic head. The two tracks form one frame on the tape. The data is recorded in the unit of one frame. When reproducing, the data recorded in one track is read out by one magnetic head, and the data recorded in the other track is read out by the other magnetic head. When reproducing in the normal direction, the data in one frame is first read out on one track and then on the other track. When reproducing in the reverse direction, first the data of the other track is read out, and the data is fed into a delay circuit composed of memory. The delay circuit, after the data of one track is read out and output, outputs the data of the other track. Also in reproduction in the reverse direction, the data composing one frame is output in the same sequence as in reproduction in the normal direction.

6. 发明授权

US5113295A Recording and reproducing apparatus for rewriting data onto a previously recorded medium using a relaying operation 失效
标题翻译：用于使用中继操作将数据重写到先前记录的介质上的记录和再现装置
公开(公告)号：US5113295A
公开(公告)日：1992-05-12
申请号：US390769
申请日：1989-08-08
申请人： Kengo Sudoh , Hiroshi Ii
发明人： Kengo Sudoh , Hiroshi Ii
IPC分类号： G11B20/10 , G11B5/008 , G11B15/04 , G11B15/087 , G11B20/12 , G11B27/032 , G11B27/036
CPC分类号： G11B27/036 , G11B15/04 , G11B15/087 , G11B20/1209 , G11B5/0086 , G11B20/1211 , G11B2220/216 , G11B2220/90 , G11B2220/913 , G11B27/032
摘要： An azimuth recording system has been adopted in order to heighten the recording intensity in a DAT (digital audio tape) recorder of rotary head type. For this reason, the width of a track is made more narrow than that of the magnetic head, and tracking control is conducted on the basis of the reproduction signals from the tracks at both sides during reproducing. In such a DAT recorder, in the case of rewriting data, the magnetic head is changed over to the recording mode at a point of time when reproduction operation is terminated for a corresponding track so that rewriting begins at a track which is disposed at least one thereafter the track to be rewritten, and new data is recorded, thereby causing a desired track which must be maintained to be prevented from being recorded over by a new track. In addition, a distinguisher information is recorded in each of tracks. In the case the same distinguisher information is detected when a distinguisher information is read out and compared, data which has been previously read out is not outputted, thereby ensuring that data which must be originally deleted, be prevented from being erroneously outputted. Therefore, a rewriting operation can be easily conducted without the need of any complicated control circuits.
摘要翻译：采用方位记录系统，以提高旋转头型DAT（数字录音带）记录仪的记录强度。因此，轨道的宽度比磁头的宽度更窄，并且基于再现期间来自两侧的轨道的再现信号进行跟踪控制。在这样的DAT记录器中，在重写数据的情况下，在对于相应的轨道的再现操作终止的时间点，将磁头切换到记录模式，以便重写开始于设置在至少一个此后将重写轨道，并记录新的数据，由此导致必须保持的期望轨迹被防止被新轨道记录。此外，每个轨道中记录有识别信息。在这种情况下，当识别识别信息被读出和比较时检测到相同的识别信息时，不输出先前读出的数据，从而确保防止错误地输出必须被最初删除的数据。因此，可以容易地进行重写操作而不需要任何复杂的控制电路。

7. 发明授权

US4916403A Digital phase-locked loop system 失效
标题翻译：数字锁相环系统
公开(公告)号：US4916403A
公开(公告)日：1990-04-10
申请号：US251402
申请日：1988-09-30
申请人： Kengo Sudoh , Hiroshi Ii , Hiroyuki Matsuoka
发明人： Kengo Sudoh , Hiroshi Ii , Hiroyuki Matsuoka
IPC分类号： H03L7/099
CPC分类号： H03L7/0992
摘要： A digital phase-locked loop system having an oscillator which generates a clock signal of a stationary frequency, a frequency divider which frequency-divides the clock signal to produce a phase-locked loop clock signal, a phase difference detector which detects a phase difference between an input signal and the phase-locked loop clock signal and outputs a phase difference detection signal, and a frequency dividing rate setting device to set a frequency dividing rate corresponding to the phase difference in response to the phase difference detection signal and apply the rate to the frequency divider. The phase difference detector includes a first counter to detect a phase difference at a leading edge of the clock signal from the oscillator and a second counter to detect it at a trailing edge of the clock signal. The frequency dividing rate setting device includes an adder to add the phase differences detected by the first and second counters, a latch to hold an addition result produced by the adder, and a decoder to decode the frequency dividing rate corresponding to the addition result held by the latch. The frequency divider frequency-divides the clock signal according to the frequency dividing rate decoded by the decoder and newly generates a phase-locked loop clock signal.

8. 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。

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