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1. 发明专利

JPS61144114A DIGITAL FILTER 失效
公开(公告)号：JPS61144114A
公开(公告)日：1986-07-01
申请号：JP26522784
申请日：1984-12-18
申请人： HITACHI LTD
发明人： NISHIJIMA HIDEO , OKAMOTO CHIKAYUKI , SEKIYA MASATAKA , FUKUSHIMA ISAO , FUNASHIRO HIDEKAZU
IPC分类号： H03H17/04
摘要： PURPOSE:To decrease sufficiently a crossover frequency to a sampling frequency by using a feedback loop comprising a multiplier with a prescribed factor, a unit delay element and a subtractor so as to apply sequential moving means to an input signal. CONSTITUTION:The input signal X is fed to an adder 13. A unit delay element 15 retards an output of the adder 13. The multiplier circuit 17 multiplies an output signal of the unit delay element 5 with a prescribed factor. The subtractor 19 subtracts the output signal of the multiplier 17 from the output signal of the unit delay element 15. A multiplier 18 multiplies the output signal of the adder 13 with a prescribed factor. The output signal of the subtractor 19 is fed to the adder 13 to constitute a feedback loop. The output signal of the multiplier 18 is used as an output signal of a digital filter 12.

2. 发明专利

JPS6057274B2 失效
公开(公告)号：JPS6057274B2
公开(公告)日：1985-12-13
申请号：JP6504479
申请日：1979-05-28
申请人： HITACHI LTD
发明人： MIZUTANI KEIICHI , FUNASHIRO HIDEKAZU
IPC分类号： H04N9/793 , H04N9/79 , H04N9/80

3. 发明专利

JPS5942369B2 JPS5942369B2 - 失效
公开(公告)号：JPS5942369B2
公开(公告)日：1984-10-15
申请号：JP5637977
申请日：1977-05-18
申请人： Hitachi Ltd
发明人： SHIBATA AKIRA , FUNASHIRO HIDEKAZU
IPC分类号： H04N5/922 , G11B20/06 , H04N5/93

4. 发明专利

JPS59165581A Video recording and reproducing device 失效
标题翻译：视频录像和再现设备
公开(公告)号：JPS59165581A
公开(公告)日：1984-09-18
申请号：JP3733483
申请日：1983-03-09
申请人： Hitachi Ltd
发明人： FUNASHIRO HIDEKAZU , KUBOTA TAKASHI
IPC分类号： G11B5/027 , H04N5/783
CPC分类号： H04N5/783
摘要： PURPOSE:To obtain the field still reproduced pictures by setting the video track width A of a pair of the same azimuth heads at 2T-B
摘要翻译：目的：通过在2T-B

5. 发明专利

JPS5954396A Video recorder and reproducer 失效
标题翻译：视频录像机和复印机
公开(公告)号：JPS5954396A
公开(公告)日：1984-03-29
申请号：JP16383282
申请日：1982-09-22
申请人： Hitachi Ltd
发明人： FUKUSHIMA YOSHIMITSU , KANESAKI TAKAYUKI , KIMURA KAZUHIKO , FUNASHIRO HIDEKAZU
IPC分类号： H04N9/87 , H04N9/79
CPC分类号： H04N9/79
摘要： PURPOSE:To correct the phase difference of a color signal, by taking a switching signal of a circuit correcting 1/2H shift as a trigger and generating a switching signal of a circuit correcting the phase difference of the color signal and switching the phase of trigger in response to the direction of the variable speed reproduction. CONSTITUTION:A reproducing color signal 1 is delayed with a 1H delay line 2 to obtain a reproducing color signal 4 after changing over the color signal with delay at a switch 3 and a color signal without delay. At variable speed reproduction, a 1/2H shift switching pulse 5 triggers a flip-flop 6, and a switch 7 changes over outputs Q, Q' of the flip-flop 6 for the variable speed reproduction in the same direction as the normal reproduction and for the variable speed reproduction in an opposite direction, so as to attain a trigger of the flip-flop 8 and the outut of the flip-flop 8 is taken as the drive pulse of the switch 3.
摘要翻译：目的：为了校正彩色信号的相位差，通过将1 / 2H频移的电路的切换信号作为触发，并产生校正彩色信号的相位差并切换触发相位的电路的切换信号响应于可变速度再现的方向。构成：以1H延迟线2延迟重放彩色信号1，以便在开关3上延迟颜色信号和彩色信号无延迟地改变颜色信号后获得再现色信号4。在可变速度再现时，1 / 2H移位切换脉冲5触发触发器6，并且开关7在与正常再现相同的方向上改变触发器6的输出Q，Q'进行可变速度再现并且为了在相反方向进行可变速度再现，以获得触发器8的触发，并且将触发器8的跳闸作为开关3的驱动脉冲。

6. 发明专利

JPS57186891A PICTURE RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS57186891A
公开(公告)日：1982-11-17
申请号：JP7072581
申请日：1981-05-13
申请人： HITACHI LTD
发明人： KANESAKI TAKAYUKI , FUNASHIRO HIDEKAZU
IPC分类号： H04N9/80 , H04N9/82 , H04N9/83
摘要： PURPOSE:To switch a system without debasing its frequency control capacity, at a low cost, by using a simple quartz oscillator for a color signal processing circuit, and switching the PAL system and the NTSC system by turning on or off this oscillator. CONSTITUTION:When recording, outputs of a 40fh oscillating circuit 5 controlled by a horizontal synchronizing signal fh applied to a terminal 4, and a changeover switch 6 are added by a converter 3, and only the sum frequency passes through a BPF 2, is supplied to a converter 1, and the input signal is converted to a low band. When inputting the switch 6, an (fsc+fh/8) oscillator 8 and a voltage control type quartz fsc oscillator 8 are selected in case of the PAL system and the NTSC system, respectively. A phase comparing circuit 10 is switched by a changeover switch 9 so as to control the oscillator 8 and a circuit system of the circuit 5, when recording and reproducing respectively. When reproducing, outputs of the circuit 5 and the switch 6 are added by the converter 3, only the sum frequency passes through the BPF 2, and is converted to its original frequency fsc by the converter 1. In this case, the oscillator 8 is made to run freely.

7. 发明专利

JPS54100220A SYNCHRONOUS SIGNAL ISOLATOR CIRCUIT 失效
公开(公告)号：JPS54100220A
公开(公告)日：1979-08-07
申请号：JP620178
申请日：1978-01-25
申请人： HITACHI LTD
发明人： FUNASHIRO HIDEKAZU , ISHIKAWA SHIGERU
IPC分类号： H04N5/08
摘要： PURPOSE:To decrease the number of the component parts without lowering the performance of the synchronous isolator circuit by using the base saturation type clipping circuit instead of the clipping circuit using the differential amplifier. CONSTITUTION:The composite video signal supplied to input terminal 1 is amplified through transistor 9 and 12 forming amplifier circuit 2 and then applied to clamping circuit 3. The tip of the synchronous signal is clamped by the voltage which is obtained by lowering the video signal from constant voltage source 18 by the voltage of diode 16 via capacitor 15, diode 16 and resistance 17. The clamped video signal is then lowered by the rise voltage of diode 19 via diode 19 and resistance 20 and applied to the base of Tr21 which functions as the clipping and amplifier circuits. Thus, the synchronous pulse synchronized with the synchronous signal of the composite video signal is delivered through the collector of Tr21 via Tr21.

8. 发明专利

JPH04109404A MAGNETIC ERASING DEVICE FOR VIDEO TAPE RECORDER 失效
公开(公告)号：JPH04109404A
公开(公告)日：1992-04-10
申请号：JP22656890
申请日：1990-08-30
申请人： HITACHI LTD
发明人： OZAKI YUKIHIKO , MORO EIJI , OTSUKA SUSUMU , FUNASHIRO HIDEKAZU , YOSHINO MASANORI
IPC分类号： G11B5/024
摘要： PURPOSE:To give the operation of only erasure to a recorded magnetic tape, and to realize high-speed erasure by generating an erasing signal at an operation mode other than a recording mode, and erasing the magnetic tape by the erasing signal. CONSTITUTION:A VTR is provided with an erasure command button, and when a user operates it, a microcomputer supplies the control voltage of H from an input terminal 44, and a transistor 43 is turned on. Therefore, supply voltage Vcc is voltage-divided by resistors 29, 31, and is impressed to the base of the transistor 40, and the transistor 40 is turned on, and the erasing signal is supplied to a total width erasing head 2. Namely, even at the time of the mode other than the recording mode, the erasing signal can be supplied to the total width erasing head 2. Thus, the operation of only the erasure is executed for the recorded magnetic tape, and in addition, the high-speed erasure is realized.

9. 发明专利

JPS635804B2 失效
公开(公告)号：JPS635804B2
公开(公告)日：1988-02-05
申请号：JP11579078
申请日：1978-09-22
申请人： HITACHI LTD
发明人： ITO SATOSHI , FUNASHIRO HIDEKAZU
IPC分类号： H04N5/783 , G11B5/02 , G11B5/53

10. 发明专利

JPS6232867B2 失效
公开(公告)号：JPS6232867B2
公开(公告)日：1987-07-17
申请号：JP8587479
申请日：1979-07-09
申请人： HITACHI LTD
发明人： AZUMA NOBUO , MORI KATSUO , FUNASHIRO HIDEKAZU , KUBOTA TAKASHI
IPC分类号： G11B5/52 , H04N5/783

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