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公开(公告)号：US6031966A
公开(公告)日：2000-02-29
申请号：US984165
申请日：1997-12-03
摘要： The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (N.gtoreq.1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in accordance with period information of the FG pulse signal outputted from the waveform shaping circuit. The motor speed control device is further provided with an FG nonuniformity correcting circuit for correcting, by using respective period information of a rising edge-falling edge period and a falling edge-rising edge period, periodic nonuniformity of each period. The motor speed control device controls the motor in response to an actual speed error signal whose nonuniformity such as a duty error and a phase error has been corrected by the FG nonuniformity correcting circuit. The described arrangement permits to provide a motor speed control device having a wide control band and a large servo gain capable of accurately controlling the rotation speed of the motor.
摘要翻译： 本发明的电动机速度控制装置设置有FG传感器和波形整形电路，用于在电动机的一次旋转中获得N个脉冲信号（N> / = 1，其中N是整数），以便控制转速 根据从波形整形电路输出的FG脉冲信号的周期信息。 电动机速度控制装置还设置有FG不均匀性校正电路，用于通过使用每个周期的周期性不均匀性，通过使用上升沿下降沿周期和下降沿上升沿周期的周期信息进行校正。 电动机速度控制装置响应于由FG不均匀性校正电路校正了诸如占空误差和相位误差等不均匀性的实际速度误差信号来控制电动机。 所述布置允许提供具有宽的控制带和大的伺服增益的电动机速度控制装置，其能够精确地控制电动机的转速。
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公开(公告)号：US6049182A
公开(公告)日：2000-04-11
申请号：US993527
申请日：1997-12-18
CPC分类号： H02P6/10
摘要： A sinusoidal wave data stream for correcting a torque ripple of a motor is stored in a torque ripple corrective memory. As the motor rotates, rotational angle information is computed from a rotational pulse signal and a rotor magnetic pole position pulse signal, which are generated accompanying the rotation. A sinusoidal wave data corresponding to the rotational angle information is recalled. Then, the sinusoidal wave data constituting a torque ripple corrective signal is subtracted from a motor control signal. With the use of the motor control signal after the subtraction, the motor is driven and controlled. With this arrangement, the motor torque ripple, which is a main cause of speed fluctuation of a polyphase brushless motor, is suppressed and stable and precise motor speed control is achieved.
摘要翻译： 用于校正马达的扭矩波动的正弦波数据流被存储在转矩脉动校正存储器中。 随着电动机的旋转，旋转角度信息是根据旋转脉冲信号和转子磁极位置脉冲信号计算的。 回调与旋转角度信息对应的正弦波数据。 然后，从电动机控制信号中减去构成转矩脉动校正信号的正弦波数据。 减法后使用电机控制信号，驱动和控制电机。 通过这种布置，抑制了作为多相无刷电动机的速度波动的主要原因的电动机转矩脉动，并且实现了稳定和精确的电动机速度控制。
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3.发明授权
公开(公告)号：US5355392A
公开(公告)日：1994-10-11
申请号：US986490
申请日：1992-12-07
申请人： Hitoshi Takeuchi , Chiaki Yamawaki
发明人： Hitoshi Takeuchi , Chiaki Yamawaki
CPC分类号： H04L7/0334 , G11B20/10009
摘要： A digital receive signal is sampled by an A/D converter, and the position of a point at which the receive signal crosses a reference level is obtained in response to sampling data by an exclusive OR gate. A phase interval between the present sampling point and the point at which the receive signal crosses the reference level is obtained by an arithmetic circuit, and the phase of the present sampling point is obtained in accordance with the position of the crossing point, the phase interval P between the present sampling point and the crossing point obtained by arithmetic circuit, the phase of a preceding sampling point obtained by an I-bit parallel delay circuit, and the phase of a sampling point which is two points preceding to the present sampling point and obtained by an I-bit j-stage parallel delay circuit. A data detection clock signal and digital data are detected in accordance with the computed phase of each sampling point, an MSB of sampling data, and the phase interval between the present sampling point and the point at which the receive signal crosses the reference level.
摘要翻译： 通过A / D转换器对数字接收信号进行采样，并且通过异或门响应于采样数据获得接收信号越过参考电平的点的位置。 本采样点与接收信号越过基准电平的点之间的相位间隔由算术电路获得，根据交叉点的位置，相位间隔获得当前采样点的相位 通过算术电路获得的当前采样点和交叉点之间的P，由I比特并行延迟电路获得的先前采样点的相位和作为当前采样点之前两点的采样点的相位，以及 通过I位j级并行延迟电路获得。 根据计算出的每个采样点的相位，采样数据的MSB以及当前采样点与接收信号跨越基准电平的点之间的相位间隔来检测数据检测时钟信号和数字数据。
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公开(公告)号：US5668746A
公开(公告)日：1997-09-16
申请号：US364187
申请日：1994-12-27
申请人： Tetsuo Iwaki , Toshiaki Harada , Chiaki Yamawaki
发明人： Tetsuo Iwaki , Toshiaki Harada , Chiaki Yamawaki
IPC分类号： G11B5/035 , G11B5/09 , G11B20/10 , H03H15/00 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/04 , G06F17/10 , G11B5/00
CPC分类号： G11B20/10037 , G11B20/10009 , G11B20/10046 , G11B5/035 , G11B5/09
摘要： Low-frequency components of a reproduced modulated signal is attenuated by an analog high-pass filter. The modulated signal with its low-frequency components attenuated is converted into a digital signal by means of an A/D converter. Then, the digital signal is directly introduced to a finite impulse response digital filter to be subjected to reproduced waveform equalization. Thereafter, the attenuation of the low-frequency components effected by the analog high-pass filter is compensated in an infinite impulse response digital filter.
摘要翻译： 再现调制信号的低频分量由模拟高通滤波器衰减。 其衰减的低频分量的调制信号通过A / D转换器转换为数字信号。 然后，将数字信号直接引入有限脉冲响应数字滤波器以进行再现波形均衡。 此后，由无限脉冲响应数字滤波器补偿由模拟高通滤波器影响的低频分量的衰减。
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公开(公告)号：US5517369A
公开(公告)日：1996-05-14
申请号：US348161
申请日：1994-11-28
申请人： Hitoshi Takeuchi , Eiji Yamada , Chiaki Yamawaki , Tetsuo Iwaki
发明人： Hitoshi Takeuchi , Eiji Yamada , Chiaki Yamawaki , Tetsuo Iwaki
IPC分类号： G11B5/00 , G11B5/008 , G11B5/02 , G11B5/035 , G11B5/09 , G11B5/39 , G11B5/49 , G11B15/02 , G11B15/12
CPC分类号： G11B5/3961 , G11B15/02 , G11B15/12 , G11B5/02 , G11B5/035 , G11B5/09 , G11B5/4992 , G11B2005/0016 , G11B5/00813
摘要： In a multi-track magnetic signal reproducing apparatus, a plurality of MR heads including MR (Magneto Resistance Effect) elements are provided correspondingly to tracks on a magnetic tape. At the time of reproduction, constant current from a constant current power supply is sequentially supplied as pulse-shaped current for detecting a signal to each MR element by a switching operation by switch in response to a prescribed clock signal, and output voltage from each MR element related to reproduction of a magnetic signal on a corresponding track is sequentially provided to one input side of a differential amplifier. In differential amplifier, the offset voltage of each MR element provided to the other input side and the above-described output voltage are differentially amplified and only voltage due to the reproducing magnetic signal of each track is accurately extracted. Accordingly, the supply of pulse-shaped current effectively suppresses increase in the amount of consumption current regardless of the number of tracks on the tape (or the number of heads), and since amplifier is shared between the tracks, the number of necessary terminals for such a multi-track MR head is reduced.
摘要翻译： 在多磁道磁信号重放装置中，相应于磁带上的轨道提供包括MR（磁阻效应）元件的多个MR磁头。 在再现时，来自恒流电源的恒定电流作为脉冲形电流被顺序提供，用于通过响应于规定的时钟信号的开关的切换操作检测每个MR元件的信号，并且从每个MR输出电压 将与相应轨道上的磁信号的再现相关的元件依次提供给差分放大器的一个输入侧。 在差分放大器中，提供给另一输入侧的每个MR元件的偏移电压和上述输出电压被差分放大，并且仅准确地提取由于每个磁道的再现磁信号引起的电压。 因此，脉冲电流的供给有效地抑制消耗电流量的增加，而与带上的磁道数（或磁头数）无关，并且由于放大器在磁道之间共享，所以需要的端子的数量 这样的多轨MR磁头减少了。
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6.发明授权Phase detecting circuit of brushless motor and magnetic recording and reproducing apparatus using the same 失效无刷电动机的相位检测电路及使用其的磁记录再生装置
公开(公告)号：US5920163A
公开(公告)日：1999-07-06
申请号：US863341
申请日：1997-05-27
申请人： Hiroshi Tatsumi , Chiaki Yamawaki
发明人： Hiroshi Tatsumi , Chiaki Yamawaki
IPC分类号： G11B15/18 , G11B15/467 , G11B15/473 , H02K29/14 , H02P6/06 , H02P29/00 , A02K23/00
CPC分类号： H02P6/06 , G11B15/1875 , G11B15/4672 , G11B15/4733 , H02K29/14
摘要： A differential amplifier amplifies a PG reproduction signal to a level permitting signal processing. A low-pass filter makes the signal waveform of a PG detection signal generated by the differential amplifier substantially uniform irrespectively of the rotational speed of a rotating drum. A comparator outputs a PG pulse by comparing an output of the low-pass filter with a threshold. A magnetic recording and reproducing apparatus having such a structure can detect the PG pulse with accuracy over a rotational speed range requiring a precision control of the rotating drum.
摘要翻译： 差分放大器将PG再现信号放大到允许信号处理的电平。 低通滤波器使得差分放大器产生的PG检测信号的信号波形基本上与转鼓的转速无关。 比较器通过将低通滤波器的输出与阈值进行比较来输出PG脉冲。 具有这种结构的磁记录和再现装置可以在需要精确控制旋转滚筒的旋转速度范围内精确地检测PG脉冲。
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公开(公告)号：US5834761A
公开(公告)日：1998-11-10
申请号：US821858
申请日：1997-03-21
申请人： Hideo Okada , Masayuki Nishikawa , Tohru Okuda , Tetsuo Iwaki , Chiaki Yamawaki , Yoshinori Kinai
发明人： Hideo Okada , Masayuki Nishikawa , Tohru Okuda , Tetsuo Iwaki , Chiaki Yamawaki , Yoshinori Kinai
CPC分类号： G03B5/00 , H04N1/40068 , H04N5/2254 , H04N5/2259 , H04N9/045 , H04N2209/046
摘要： The Invention is an image input apparatus equipped with means of image shifting which is capable of inputting images of different resolutions, and enables the transmission band of the spatial filter to be switched in accordance with resolution in order to prevent moire. When a flat transparent refraction plate 22 is inclined relative to the optical axis 10 by which light from the object is introduced, the position where the image is formed on the imaging surface of the CCD 14 is shifted, thus making image shifting possible. High resolution images are obtained by shifting the image a distance shorter than the distance between the photosensitive parts of the CCD 14, and then combining the images. The transmission band of the spatial filter 12 for preventing moire can be switched by changing the relative angles of the double refraction plates 20, 21. The transmission band of the spatial filter 12 is switched to the high frequency side when inputting high resolution images by means of the image shift mechanism 13, thus obtaining images of good resolution.
摘要翻译： 本发明是一种图像输入装置，其具有能够输入不同分辨率的图像的图像移位装置，并且能够根据分辨率切换空间滤波器的发送频带，以防止莫尔条纹。 当平坦的透明折射板22相对于被引入物体的光的光轴10倾斜时，在CCD 14的成像表面上形成图像的位置被移位，从而使图像移位成为可能。 通过将图像移动距离短于CCD 14的感光部分之间的距离，然后组合图像来获得高分辨率图像。 可以通过改变双折射板20,21的相对角度来切换用于防止莫尔条纹的空间滤波器12的传输带。当通过装置输入高分辨率图像时，空间滤波器12的传输频带切换到高频侧 的图像偏移机构13，从而获得良好的分辨率的图像。
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公开(公告)号：US5262908A
公开(公告)日：1993-11-16
申请号：US704771
申请日：1991-02-14
申请人： Tadashi Iwamatsu , Chiaki Yamawaki , Tohru Okuda
发明人： Tadashi Iwamatsu , Chiaki Yamawaki , Tohru Okuda
CPC分类号： G11B5/5508
摘要： A tracking control device for a magnetic recording/reproducing apparatus arranged in such a manner that a head unit having a plurality of magnetic heads is successively moved in the widthwise direction of a magnetic tape for switching tracking positions so that data recording/reproducing is, by each of the plurality of magnetic heads, performed along a plurality of data tracks formed on the magnetic tape in parallel to a direction in which the magnetic tape moves. The tracking control device has at least two servo signal reproducing heads provided integrally with the head unit and provided for the purpose of reproducing servo signals for tracking use from a plurality of servo tracks formed in parallel to the data tracks on the magnetic tape, and movement control unit for controlling, at each of the tracking positions, movement of the head unit in the widthwise direction in accordance with the difference in two servo signals reproduced by adjacent two of the servo signal reproducing heads corresponded to each of the tracking positions.
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9.发明授权
公开(公告)号：US5173815A
公开(公告)日：1992-12-22
申请号：US674207
申请日：1991-03-25
申请人： Tetsuo Iwaki , Hidetaka Mizumaki , Chiaki Yamawaki
发明人： Tetsuo Iwaki , Hidetaka Mizumaki , Chiaki Yamawaki
IPC分类号： G11B20/12 , G11B27/02 , G11B27/032 , G11B27/036
CPC分类号： G11B27/036 , G11B2220/216 , G11B2220/90 , G11B2220/913 , G11B27/032
摘要： A recording position compensation circuit for use in the digital information recording-reproduction apparatus of the present disclosure has a microprocessor for generating an offset signal indicating a deviation between standard signal processing time, which is required for a process wherein digital medium information already recorded on the recording medium is reproduced through the advanced reproduction head and re-recorded on the recording medium through the recording head, and inter-head travelling time required for the recording medium to travel a distance from the advanced reproduction head to the recording head. A first counter generates a reference symbol pointer indicating a reference of a sequence whereby digital information stored in the memory is read out so that a part of the digital information is rewritten. A second counter generates a compensated symbol pointer having a phase difference corresponding to the deviation with respect to the reference symbol pointer. Thus, since digital information is read out from the memory so that the signal processing time from reproduction to re-recording may coincide with the inter-head travelling time, a recording position on the recording medium at which rewriting is performed, is corrected.
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公开(公告)号：US4812987A
公开(公告)日：1989-03-14
申请号：US795231
申请日：1985-11-05
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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