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    • 25. 发明授权
    • Magnetic tape recording apparatus
    • 磁带记录装置
    • US06690877B1
    • 2004-02-10
    • US09505856
    • 2000-02-17
    • Yoshio Higuchi
    • Yoshio Higuchi
    • H04N980
    • H04N9/83
    • In a magnetic tape recording apparatus for recording an FM luminance signal and a low frequency converted chrominance onto tracks of a magnetic tape, both of a frequency of the FM luminance signal and a spectrum distribution of the low frequency converted chrominance are shifted by fH/2 between two of the tracks corresponding to the first field and the second field of one frame of a recorded image when a horizontal scanning frequency is presumed as fH. The frequency of the FM luminance signal is shifted by fw/4 between two of the tracks corresponding to the second field of one frame and the first field of the subsequent frame.
    • 在用于将FM亮度信号和低频转换的色度记录在磁带的轨道上的磁带记录装置中,FM亮度信号的频率和低频转换色度的频谱分布都被移位fH / 2 当将水平扫描频率推定为fH时,在与记录图像的一帧的第一场和第二场相对应的两个轨道之间。 FM亮度信号的频率在对应于一帧的第二场和随后帧的第一场的两个轨道之间移位fw / 4。
    • 26. 发明授权
    • Magnetic recording device
    • 磁记录装置
    • US06687452B1
    • 2004-02-03
    • US09469538
    • 1999-12-22
    • Yoshio Higuchi
    • Yoshio Higuchi
    • H04N979
    • H04N5/92G11B5/0086G11B5/02
    • A magnetic recording device provided with a frequency modulation circuit, a filter circuit, and a frequency conversion circuit. The frequency modulation circuit generates a modified FM luminance signal the frequency of a carrier wave of which is higher than that of an FM luminance signal and the relationship between the frequency of a sink chip and the frequency of a white peak of which is equal to the relationship between the frequency fs and the frequency fw of the FM luminance signal when the minimum frequency of the frequency band of the FM luminance signal is the frequency fa. The filter circuit removes a signal component lower than a cut-off frequency of signal components included in the modified FM luminance signal when a frequency. lower than the minimum frequency of the band of the modified FM luminance signal by a frequency acquired by doubling the frequency fa is the cut-off frequency. The frequency conversion circuit generates the above FM luminance signal by converting the frequency of output from the filter circuit by using a local oscillated signal of a frequency lower than the frequency of the carrier wave of the modified FM luminance signal.
    • 具有频率调制电路,滤波电路和频率转换电路的磁记录装置。 频率调制电路产生修正的FM亮度信号,其载波的频率高于FM亮度信号的频率,以及宿芯片的频率与其白峰的频率之间的关系等于 当FM亮度信号的频带的最小频率是频率fa时,FM亮度信号的频率fs和频率fw之间的关系。 滤波器电路当频率时除去低于包含在修改的FM亮度信号中的信号分量的截止频率的信号分量。 低于修改的FM亮度信号的频带的最小频率,通过倍频频率获得的频率fa是截止频率。 频率转换电路通过使用频率低于修改的FM亮度信号的载波的频率的本地振荡信号来转换来自滤波器电路的输出频率,生成上述FM亮度信号。
    • 27. 发明授权
    • Magnetic tape drive having a mechanism for preventing slack in a magnetic tape
    • 磁带驱动器具有防止磁带松弛的机构
    • US06683742B2
    • 2004-01-27
    • US09851788
    • 2001-05-09
    • Yoshio Higuchi
    • Yoshio Higuchi
    • G11B1548
    • G11B15/43G11B15/22
    • A magnetic tape drive has a brake mechanism section which can transfer the state of a reel table from a non-brake state to a brake state by using an electric power that remains after a start of a power failure of a commercial power source. The drive further has a first power failure detecting section which, when a power failure of the commercial power source is detected, transmits a first power failure detection signal; and a controlling section which, when the first power failure detection signal is transmitted in a fast-forwarding state or a rewinding state, transfers the non-brake state of the brake mechanism section to the brake state.
    • 磁带驱动器具有制动机构部分,其可以通过使用在商用电源的电源故障开始之后保持的电力将卷轴台的状态从非制动状态转移到制动状态。 驱动器还具有第一停电检测部,其在检测到商用电源的电源故障时发送第一电源故障检测信号; 以及控制部,当所述第一停电检测信号以快进状态或重绕状态发送时,将所述制动机构部的非制动状态转移到制动状态。
    • 28. 发明授权
    • Control signal amplification circuit
    • 控制信号放大电路
    • US6147554A
    • 2000-11-14
    • US220498
    • 1998-12-24
    • Yoshio Higuchi
    • Yoshio Higuchi
    • G11B5/53G11B15/467G11B20/10H03F1/36
    • G11B20/10027G11B20/10009G11B15/4671G11B2020/10981G11B5/53
    • A control signal amplification circuit for amplifying a control signal reproduced by a control head. The control signal amplification circuit includes a level detection circuit for detecting an output level of an amplification circuit body having an amplification factor determined on the basis of the quantity of negative feedback to thereby send out a level control signal indicating a result of the detection, and a variable feedback resistance circuit which is connected between a minus-input terminal and an output terminal of the amplification circuit body so that the equivalent resistance value of the variable feedback resistance circuit decreases when the level control signal indicates the increase of the output level, and the equivalent resistance value of the variable feedback resistance circuit increases when the level control signal indicates the decrease of the output level, whereby the control signal is amplified without deformation of its waveform.
    • 一种用于放大由控制头再现的控制信号的控制信号放大电路。 控制信号放大电路包括电平检测电路,用于检测具有基于负反馈量确定的放大系数的放大电路体的输出电平,从而发出指示检测结果的电平控制信号,以及 可变反馈电阻电路,其连接在放大电路体的负输入端子和输出端子之间,使得当电平控制信号指示输出电平的增加时,可变反馈电阻电路的等效电阻值降低,以及 当电平控制信号表示输出电平的降低时,可变反馈电阻电路的等效电阻值增加,由此控制信号在其波形不变形的情况下被放大。
    • 29. 发明授权
    • Switching power source with power outage detection signal
    • 断电检测信号切换电源
    • US6002602A
    • 1999-12-14
    • US924658
    • 1997-09-05
    • Yoshio Higuchi
    • Yoshio Higuchi
    • H02H3/24H02H7/12H02M3/335
    • H02M3/33523H02M2001/0022
    • In a switching power source, an error signal indicating an error of an output voltage is applied to an insolation element whose input and output are insolated from each other, and an output of the insolation element is utilized to control a switching operation, thereby to stabilize the output voltage. The switching power source includes a power outage detecting section in which, when an input voltage of a switching circuit adapted to switch a current flowing in a primary coil becomes lower than a predetermined value, the level of the error signal is a limit level, and when the level of the error signal becomes the limit level, a power outage detection signal is produced.
    • 在开关电源中,将表示输出电压的误差的误差信号施加到其输入和输出被彼此绝缘的隔离元件,并且使用该隔离元件的输出来控制开关操作,从而稳定 输出电压。 开关电源包括断电检测部分,其中当适于切换在初级线圈中流动的电流的开关电路的输入电压变得低于预定值时,误差信号的电平是极限电平,并且 当误差信号的电平变为极限电平时,产生断电检测信号。