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1. 发明专利

JPS60258761A PULSE REPRODUCTION CIRCUIT FOR DIGITAL MAGNETIC RECORDING 失效
公开(公告)号：JPS60258761A
公开(公告)日：1985-12-20
申请号：JP11300084
申请日：1984-06-04
申请人： HITACHI LTD , HERCULES INC
发明人： MICHIKAWA YUUICHI , MITA SEIICHI , UMEMOTO MASUO , SHIONO HIROSHI , ETOU YOSHIZUMI
IPC分类号： G11B20/10 , H04N5/91 , H04N5/92

2. 发明专利

JPS61269532A PHASE LOCKED LOOP CIRCUIT 失效
公开(公告)号：JPS61269532A
公开(公告)日：1986-11-28
申请号：JP11043785
申请日：1985-05-24
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IZUMIDA MORIJI , DOI NOBUKAZU , MITA SEIICHI , ROKUTA MORIHITO , SHIONO HIROSHI
IPC分类号： H03L7/14 , H03L7/06 , H04L7/033 , H04N5/93
摘要： PURPOSE:To obtain a voltage controlled oscillation output signal with less affected by dropout by switching an input signal during dropout period into an output signal in a phase locked loop control circuit to which a discontinuous signal is inputted due to dropout. CONSTITUTION:A selector circuit 10 selecting the output of a tank circuit 2 and an output of a voltage controlled oscillation circuit 6 is added. The circuit 10 is phase-locked in loop by an output of an envelope detection circuit 7, the output of the circuit 2 while no dropout exists selects the output of the circuit 16 when dropout takes place. An output 11 of the circuit 10 and an output 12 of the circuit 6 input to a phase comparator 3 to generate an error voltage 13 proportional to the phase difference, after the voltage is smoothed by an LPF 5, the result is inputted to the circuit 6. The circuit 6 outputs a signal 12 having a frequency proportional to the input voltage 14 and feeds back it to the circuit 10 and the comparator 3.

3. 发明专利

JPS60667A DIGITAL SIGNAL MODULATING SYSTEM 失效
公开(公告)号：JPS60667A
公开(公告)日：1985-01-05
申请号：JP10788283
申请日：1983-06-17
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： IZUMIDA MORIJI , MITA SEIICHI , KOUNOUE AKIHIKO , TAKAGI HITOSHI , ROKUTA MORIHITO , KANEDA HIDEHIRO , FUJIMURA NOBUAKI , SHIONO HIROSHI
IPC分类号： H03M7/00 , G11B20/14
摘要： PURPOSE:To limit the consecution of a same code and also to eliminate a DC and a low frequency component by adding a slight redundancy bit in a circuit converting a data of input (2n-1)-bit into a data in 2n-bit. CONSTITUTION:The conversion of 7-bits into 8-bits is exemplified. In fig., 1 is a serial parallel converting circuit, 2 is read only memory ROM storing a conversion table, 3 is a parallel serial conversion circuit and 4 is a DSV calculating circuit. An input data is converted into a parallel data P (7-bit) by the serial parallel converting circuit 1 and this data is inputted to the ROM 2. Further, a data S representing the pluse or minus sign of an accumulated value DSV of the weight of past data is inputted to this ROM. The converted data Q and the weight R of the data are calculated and outputted based on 8 data. The converted data q is inputted to the parallel serial converting circuit 3, where the data is outputted after being converted into a serial data.

4. 发明专利

JPS59186106A Digital signal recording circuit 失效
标题翻译：数字信号记录电路
公开(公告)号：JPS59186106A
公开(公告)日：1984-10-22
申请号：JP6084283
申请日：1983-04-08
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： IZUMIDA MORIJI , MITA SEIICHI , KOUNOUE AKIHIKO , TAKAGI HITOSHI , ROKUTA MORIHITO , SHIONO HIROSHI , KANEDA HIDEHIRO
IPC分类号： G11B20/14 , G11B20/10
CPC分类号： G11B20/10203
摘要： PURPOSE:To suppress an average DC component without prolonging consecution of 0 or 1 by adding a redundancy bit to decrease the consecution of 0 or 1 and a redundancy bit to eliminate a DC component so as to decrease the rate of rise of a data rate. CONSTITUTION:An NRZ signal is converted into an NRZI signal so as to prevent the expansion of error due to blocking. The 1st modulation circuit 20 adds the 1st redundancy bit and controls the block so that 1s share over a half of the block. The 2nd modulation circuit 30 adds the 2nd redundancy bit and controls the block so that the accumulative value of weight closes to 0. The NRZI data is a code where preceding and succeeding bits are related to each other and two degrees of freedom are given by inserting two redundancy bits between blocks. Thus, the DC component is eliminated by using comparatively less number of redundancy bits and further, the consecution of 1s and 0s is decreased.
摘要翻译：目的：通过添加冗余位来减少0或1的连续性来抑制平均直流分量，而不延长连续使用0或1，并且冗余位消除直流分量，以降低数据速率的上升率。构成：NRZ信号被转换成NRZI信号，以防止由于阻塞造成的误差扩大。第一调制电路20添加第一冗余位并控制块，使得1s共享该块的一半以上。第二调制电路30加上第二冗余位，并控制块，使得重量的累计值接近0. NRZI数据是前后位彼此相关的代码，并且通过插入来给出两个自由度块之间的两个冗余位。因此，通过使用相对较少数量的冗余位来消除DC分量，并且还减少了1s和0s的连续性。

5. 发明专利

JPH04207374A VIDEO SIGNAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04207374A
公开(公告)日：1992-07-29
申请号：JP32883290
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIONO HIROSHI , HIKITA YUKIHIRO , KUKITANI KENJI
IPC分类号： H04N5/765 , G11B27/36 , H04N5/782
摘要： PURPOSE:To monitor an external input video signal without interrupting a reproducing mode by selecting either the output video signal of a first switching circuit by which either a regenerative video signal or the external input video signal is selected or the external input video signal and providing a second switching circuit supplied to a monitoring section. CONSTITUTION:When a recording mode, etc., other than the reproducing mode are set with a microcomputer 9 by an operation in an operation switch group 10, the video signal from the switching circuit 3 is selected by the switching circuit 6 and supplied to an external output terminal 7. When the reproducing mode is set, a signal is regenerated from a recording medium on a reproducing circuit 5, the video signal from the reproducing circuit 5 is selected by the switching circuit 6 and supplied to the external output terminal 7. Then, either one of the output video signals of the switching circuits 3 and 6 is supplied to the monitoring section 8. Thus, the interruption of the reproducing mode is eliminated and the regenerative video signal and the external input video signal are switched and monitored only by operating the operation switch for the switching circuit 12.

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

JPS6025005A REGENERATIVE PREAMPLIFIER CIRCUIT 失效
公开(公告)号：JPS6025005A
公开(公告)日：1985-02-07
申请号：JP13276283
申请日：1983-07-22
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： SHIONO HIROSHI , MITA SEIICHI , KOUNOUE AKIHIKO , IZUMIDA MORIJI , KANEDA HIDEHIRO , TAKAGI HITOSHI , ROKUTA MORIHITO
IPC分类号： G11B5/02 , H04N5/92
摘要： PURPOSE:To reproduce both a digital signal and a conventional FM signal through the same circuit by switching a frequency compensating circuit automatically. CONSTITUTION:A switch 5 is off initially. When a frequency component of 4- 5MHz in an FM signal is detected in the output of a preamplifier, the switch 5 is turned on to lower a resonance frequency, and the FM signal is thus regenerated with a good S/N. Namely, the output of the preamplifier 3 is further amplified by an amplifier 17 and the frequency component of 4-5MHz shown in a figure (a) is extracted through a BPF8 from the output, rectified on full-wave basis by a rectifying circuit 9 as shown in a figure (b), and passed through an LPF10 to detect a waveform shown in a figure (c). This is passed through a buffer amplifier 18 and detected by a comparator 11, and a monostable multivibrator 19 generates a pulse in a figure (e), so that the switch 5 is turned on when the pulse is at a high level.

8. 发明专利

JPS59186114A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS59186114A
公开(公告)日：1984-10-22
申请号：JP6084183
申请日：1983-04-08
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： KOUNOUE AKIHIKO , MITA SEIICHI , IZUMIDA MORIJI , KANEDA HIDEHIRO , SHIONO HIROSHI , ROKUTA MORIHITO , TAKAGI HITOSHI
IPC分类号： G11B5/187
CPC分类号： G11B5/1871
摘要： PURPOSE:To obtain a head of a long service life by providing plural grooves in parallel with a recording track to a sliding face of the magnetic head so as to decrease the spacing between the head and a tape. CONSTITUTION:To the sliding face of the magnetic head, >=2 grooves in parallel with the recording track are provided. Since the air placed between the tape and the sliding face of the head is moved as shown in arrows 4-6 and most of the air enters the grooves or passes through the head side face, the spacing between the head and tape is decreased. Although the depth of gap of the head is decreased because the sliding face is worn as being operated long, the effect of the grooves is kept until the service life of the head ends by making the depth of the grooves deeper than the depth of the gap.
摘要翻译：目的：为了通过在磁头的滑动面上设置与记录轨道平行的多个凹槽来获得长使用寿命的头部，以减小磁头和磁带之间的间隔。构成：提供磁头的滑动面，与记录轨道平行的> = 2个凹槽。由于放置在磁带和头部的滑动面之间的空气如箭头4-6所示移动，大部分空气进入凹槽或通过磁头侧面，磁头和磁带之间的间距减小。虽然由于滑动面的磨损长时间而使头部的间隙深度减小，但是通过使凹槽的深度比间隙的深度更深地保持凹槽的效果直到头部的使用寿命终止。

9. 发明专利

JPH04290388A LIQUID CRYSTAL DEVICE 失效
公开(公告)号：JPH04290388A
公开(公告)日：1992-10-14
申请号：JP7837191
申请日：1991-03-19
申请人： HITACHI LTD , HITACHI VIDEO & INF SYST
发明人： TAKASHIMIZU SATOSHI , INOUE FUMIO , SHIONO HIROSHI , HIKITA YUKIHIRO
IPC分类号： G02F1/133 , G09G3/20 , G09G3/36 , H04N5/66
摘要： PURPOSE:To prevent the display of an unnecessary video signal part as well as to save power consumption by controlling horizontal scanning as well as vertical scanning at the time of special reproduction for VTR. CONSTITUTION:A video signal V is applied to a synchronizing separation circuit 12, and a horizontal synchronizing signal Hs and a vertical synchronizing signal Vs is outputted from the synchronizing separation circuit 12. The signal Hs and signal Vs are applied to a control circuit 13. Here, the control circuit 13 forms various kinds of timing signals necessary for controlling a horizontal shift register 2, a sample-and-hold circuit 3, an output circuit 4, and a vertical shift register 5 by taking the signal Hs and signal Vs as reference. In this case, a control means for vertical scanning and a control means for horizontal scanning stop their scanning operation during the period of unnecessary video signals generated at the time of special reproduction.

10. 发明专利

JPH0324874A POWER SOURCE CONTROLLER FOR VIDEO SIGNAL REGENERATING DEVICE 失效
公开(公告)号：JPH0324874A
公开(公告)日：1991-02-01
申请号：JP15816789
申请日：1989-06-22
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： HIKITA YUKIHIRO , SHIONO HIROSHI , INOGUCHI YUICHI , HAMADA HARUYUKI
IPC分类号： H04N5/63 , H04N5/64 , H04N5/66
摘要： PURPOSE:To eliminate unrequired power consumption by providing a means to detect the fact that the monitoring part of a video signal is housed or covered with a protecting device, and a means to control the connection/interruption of a power source with the above-mentioned means. CONSTITUTION:When it is recognized that the monitoring part is closed by judging the housing state of the monitoring part with a switch 4, the operating mode of a video tape recorder is confirmed, and the operation of the tape recorder is stopped by interrupting a main power source 9 at a case other than that the operating mode shows recording, reproduction, or in rewinding. Also, when the mode shows the recording, the reproduction, or the in-rewinding, only the power source 10 of the monitoring part is interrupted. When the monitoring part is opened, the opening/closing state of the monitoring part last time is confirmed, and when the state of the monitoring part last time shows the closing state i.e., it is changed from the closing state to the opening state, the power source 10 of the monitoring part is connected. In such a manner, it is possible to enjoy only sound (music) only by interrupting the power source of an LCD television even when a television picture is hidden in performing a reproduction operation, which saves the power consumption when the power source is forgotten to interruption.

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