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1. 发明专利

JPS59131281A Method for correcting time axis 失效
标题翻译：校正时间轴的方法
公开(公告)号：JPS59131281A
公开(公告)日：1984-07-28
申请号：JP564283
申请日：1983-01-17
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： UMEMOTO MASUO , MIYAZAKI SHINICHI , MICHIKAWA YUUICHI , KATAYAMA HITOSHI
IPC分类号： H04N5/91 , G11B20/02 , H04N5/95
CPC分类号： H04N5/95
摘要： PURPOSE:To attain ease of calculation of time axis fluctuation and to miniaturize a device by using a signal having a waveform where a part of amplitude of a reference signal is changed in proportion to time as a time axis reference signal inserted in a video signal at the recording side. CONSTITUTION:The leading edge of a synchronizing signal SYN included in the video signal is detected and a burst signal BST of sawtooth wave is inserted after a fixed time from this point of time. A point crossing a level of a prescribed value a0 in one period of the burst signal is detected by using three sampling values a1-a3. The difference between the sampling values and a prescribed value is checked sequentially and reset is applied when the difference is negative at the sampling value a3, and a time tx of zero cross point is obtained by using the two sampling values a1, a2 before the a3. The extent of time axis correction is obtained from the shift tx.
摘要翻译：目的：为了便于计算时间轴的变动，并且通过使用具有参考信号的振幅的一部分与时间成比例地变化的波形的信号作为插入到视频信号中的时间轴参考信号而使装置小型化录音方面。构成：检测包括在视频信号中的同步信号SYN的前沿，并且在从该时间点起固定的时间之后插入锯齿波的突发信号BST。通过使用三个采样值a1-a3来检测在突发信号的一个周期中与规定值a0的电平相交的点。顺序地检查采样值和规定值之间的差异，并且当采样值a3的差为负时应用复位，并且通过使用a3之前的两个采样值a1，a2获得零交叉点的时间tx 。从移位tx获得时间轴校正的程度。

2. 发明专利

JP2006195687A Fault investigation data collection system 审中-公开
标题翻译：故障调查数据收集系统
公开(公告)号：JP2006195687A
公开(公告)日：2006-07-27
申请号：JP2005005837
申请日：2005-01-13
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATAYAMA HITOSHI , OKABAYASHI YASUHIRO , NOZAKI YOHEI , MATSUBARA SHINICHIRO , NITTA HIDEYUKI
IPC分类号： G06F11/22 , G06Q50/00 , G06Q50/10
摘要： PROBLEM TO BE SOLVED: To prevent an unexpected secondary fault by data collection when collecting data necessary to analyze a fault. SOLUTION: A policy of the risk of secondary faults permissible in a system at fault is defined as a parameter sheet 111. At data collection, the policy is compared with a databased data collection influence table 112 and dynamic information about the system at fault, and data to be acquired is selected accordingly. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了在收集分析故障所需的数据时，通过数据收集防止意外的二次故障。解决方案：在故障系统中允许的二次故障风险的策略被定义为参数表111.在数据收集时，将策略与数据库数据收集影响表112和关于系统的动态信息进行比较故障，相应地选择要获取的数据。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JPS63184966A INDENTIFICATION CLOCK GENERATING CIRCUIT 失效
公开(公告)号：JPS63184966A
公开(公告)日：1988-07-30
申请号：JP1605287
申请日：1987-01-28
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , ETO YOSHIZUMI , SAWAMURA HIDEHIKO , IZUMIDA MORIJI , KATAYAMA HITOSHI
IPC分类号： G11B20/14 , H03K5/00
摘要： PURPOSE:To always correctly set the phase between a clock and a data by using a variable point between specified 1st and 2nd points controlling the clock-generating circuit based on the informations between a second variable point and a first variable point, and between the first variable point and a subsequent second variable point to generate an identification clock. CONSTITUTION:The clock-generating circuit 400 consists of a variable frequency oscillator 11. In the circuit 400, the 1st variable point of a reproduced digital signal which is not latched by an identifying clock, and the 2nd variable point which is a rising or falling point a clock C are used, and the circuit is controlled based on the information between the second variable point and the first variable point and between the first variable point and the subsequent second variable point to generate the identification clock. Hence the raising or descending the regenerated data is always set at the center of a period of the clock even if the jitter in a running system or the variable speed irrespective of the modulation regulation.

4. 发明专利

JPS6364603A DIGITAL SIGNAL REPRODUCING DEVICE 失效
公开(公告)号：JPS6364603A
公开(公告)日：1988-03-23
申请号：JP20786686
申请日：1986-09-05
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , KANEDA HIDEHIRO , ETO YOSHIZUMI , SAWAMURA HIDEHIKO , KATAYAMA HITOSHI
IPC分类号： G11B5/09 , G11B20/18 , H04N5/92
摘要： PURPOSE:To observe or watch the state of error of each magnetic head by totaling information indicating error of code of reproduced digital signals for each head of plural magnetic heads. CONSTITUTION:Television signals are distributed from an input terminal 1-1 to three channels in a distributor circuit 1-3 through an A/ converter 1-2, and error detection codes are added in an ECC adder circuit 1-4 and recorded by magnetic heads A-D. Record pattern of a magnetic tape 1-7 is reproduced by magnetic heads A-D, and decoded to digital signals by an equivalent circuit 1-9 through a pre-amplifier 1-8. The signals are inputted to a TBC1-10, and the variation of time axis is corrected, and the code errors are detected by an ECC1-11, and the errors that can be corrected are corrected. The corrected signals are put together by an integrating circuit 1-12 and returned to TV signals by a D/A converter 1-13. On the other hand, the output signals of the ECC1-11 are inputted to a counter 2-2 through a switcher 2-1, and the error pulses are counted and displayed in a display 2-3.

5. 发明专利

JPS62121905A RECORDING CURRENT SETTING METHOD IN DIGITAL SIGNAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS62121905A
公开(公告)日：1987-06-03
申请号：JP26129685
申请日：1985-11-22
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： UMEMOTO MASUO , ETO YOSHIZUMI , TAKESHITA KAZUYUKI , KATAYAMA HITOSHI , SAWAMURA HIDEHIKO
IPC分类号： G11B5/09 , G11B5/027 , H04N5/91 , H04N5/92
摘要： PURPOSE:To eliminate setting errors due to the instability of the butting of a magnetic tape with a head and to set a highly reliable optimum recording current by keeping a magnetic tape in a still state so as to set the recording current. CONSTITUTION:With the magnetic tape in a still state, the magnetic tape 9 is rotated, and a switch 3 is switched to the side of a fixed pattern generator 4. Through the use of a pulse train at a maximum bit rate frequency with a 50% duty ratio, a switch 8 is set to a setting side. At the time of setting an optimum recording current, the switch 8 is forcibly synchronized with the cylinder rotation of a VTR, and recording and reproducing are switched for each rotation of the cylinder. The control pulse signal C1 of the generator 19 changes the amplitude of the recording current at every two scans in synchronization with the rotation. A reproducing side detects 11 at every recording current value so as to transmit to a latch circuit 16, and compares 17 it. If said amplitude is larger, the recording current becomes the new data of a latch circuit 18. Accordingly the recording current is changed, whereby the maximum value of a reproduction signal turns out to be the data of the circuit 18.

6. 发明专利

JPS60263512A WAVEFORM COMPENSATING SYSTEM 失效
公开(公告)号：JPS60263512A
公开(公告)日：1985-12-27
申请号：JP11948784
申请日：1984-06-11
申请人： HITACHI LTD , HITACHI ELECTRONICS , HITACHI VIDEO ENG
发明人： MITA SEIICHI , IZUMIDA MORIJI , MICHIKAWA YUUICHI , KATAYAMA HITOSHI , SHIONO HIROSHI , TAKAGI HITOSHI , ROKUTA MORIHITO , DOI NOBUNORI
IPC分类号： G11B20/10 , H03K5/01
摘要： PURPOSE:To compensate the waveform degradation, which is generated in a recording/reproducing system or a transmission system, to an optimum value by processing a digital signal, where the intercode interference is generated by frequency break, with an open loop. CONSTITUTION:When the digital signal where the intercode interference is generated is inputted, a discriminating circuit 12 discriminates it as ''1'' or ''0'', and required frequency components are extracted through a band pass filter 4. Meanwhile, a delay circuit 6 is so adjusted that transmission times of two routes to an adder 9 are equalized, and only frequency components which have complementary relations to those passing the filter 4 are allowed to pass a filter 5, and both of frequency components are applied to the adder 9. The output of the adder 9 is equal to the original recording or reproduced signal or transmission signal by relations of Q(f)+P(f)=1. Thereafter, a discriminating circuit 13 discriminates it as ''1'' or ''0'', and the signal is outputted. The waveform degradation is compensated to an optimum value because the digital signal is processed with the open loop in this manner.

7. 发明专利

JPS60182056A SYSTEM FOR DETECTING DETERIORATION OF SIGNAL 失效
公开(公告)号：JPS60182056A
公开(公告)日：1985-09-17
申请号：JP3606984
申请日：1984-02-29
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： MITA SEIICHI , IZUMIDA MORIJI , UMEMOTO MASUO , MICHIKAWA YUUICHI , KATAYAMA HITOSHI
IPC分类号： G11B20/10
摘要： PURPOSE:To attain simple automatic equalizing system with high accuracy by detecting the deterioration of an amplitude characteristic of a recording and reproducing system form a level difference between a peak level of an envelope of a frequency in a signal reproduced from a burst signal and a level at a DC period. CONSTITUTION:Circuits comprising an integrator 3 - an AD converter 7 process a signal and display the deterioration of the frequency characteristic of the recording and reproducing system in a binary number. A data processing section 8 generates a control signal required to control a frequency characteristic compensating device 2 based on the binary data. The basic operation of the data processing section 8 is as follows: A false sample value is eliminated and the mean value of samples of frequency corresponding to the same frequency of a multi-burst signal is obtained. Then each frequency ratio of the ideal characteristic satisfying the Nyquist condition is obtained in advance and incorporated in the memory. The ratio of each frequency is obtained by using a data obtained from the recording and reproducing system and subject to the said processing. The error (square mean error) between the ratio and the said ideal value is obtained and the frequency characteristic compensating circuit 2 is set so as to minimize the mean square error E.

8. 发明专利

JPS6057504A SIGNAL TRANSMITTING CIRCUIT 失效
公开(公告)号：JPS6057504A
公开(公告)日：1985-04-03
申请号：JP16501583
申请日：1983-09-09
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： MICHIKAWA YUUICHI , KATAYAMA HITOSHI , UMEMOTO MASUO
IPC分类号： G11B5/02 , H03H7/38
摘要： PURPOSE:To use a rotary transformer, which is used with a resonance frequency or lower, in a wide band by determining the value of a terminal resistance so that frequencies up to a frequency higher than the resonance frequency of the rotary transformer single substance can be used as a transmission band. CONSTITUTION:An emitter follower Tr1 which transmits a signal Ein from a preamplifier with a low impedance, an emitter follower Tr2 which receives the signal from the rotary transformer with a high impedance, and a terminal resistance R0 are provided, and an output signal E0 is outputted. The terminal resistance value R0 is set to satisfy R0>(L/Cni) /2 where Cin is the input capacity of a buffer amplifier and L is the inductance value of the rotary transformer viewed from the secondary side. With respect to a level A of the resonance point normalized with the value of a middle band, 60MHz band is realized by optimizing the value R0.

9. 发明专利

JP2003282284A Lamp power supply and projection image display device using the same 审中-公开
标题翻译：灯泡电源和投影图像显示装置使用它
公开(公告)号：JP2003282284A
公开(公告)日：2003-10-03
申请号：JP2002082324
申请日：2002-03-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATAYAMA HITOSHI , IKEDA MIYUKI
IPC分类号： G03B21/00 , G03B21/14 , H05B41/16 , H05B41/282
摘要： PROBLEM TO BE SOLVED: To prevent explosion failure of a high pressure mercury lamp due to a short-circuit failure of a power supply of the high pressure mercury lamp. SOLUTION: This lamp power supply driving the high pressure mercury lamp is provided with a cutoff switch in an input side or an output side of a step-down chopper circuit, a difference between the input and output voltage of the step-down chopper circuit is detected, and when the detected input/output voltage difference is a prescribed voltage difference or less, it is determined to be the short-circuit failure and the power supply to the lamp is cut off by the cutoff switch. COPYRIGHT: (C)2004,JPO

10. 发明专利

JP2559457B2 失效
公开(公告)号：JP2559457B2
公开(公告)日：1996-12-04
申请号：JP9153288
申请日：1988-04-15
申请人： HITACHI LTD
发明人： UMEMOTO MASUO , KATAYAMA HITOSHI
IPC分类号： G11B5/09 , G11B5/024 , G11B5/53

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