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1. 发明专利

DE2020559A1 未知
公开(公告)号：DE2020559A1
公开(公告)日：1971-11-11
申请号：DE2020559
申请日：1970-04-27
申请人： HITACHI LTD
发明人： TSUBAKI TOSHIO , ICHIMURA SHINYA , SAITO KAZUNORI , TANIZOE TOSHIO
IPC分类号： G03B31/06

2. 发明专利

JPH0151120B2 失效
公开(公告)号：JPH0151120B2
公开(公告)日：1989-11-01
申请号：JP9229483
申请日：1983-05-27
申请人： HITACHI LTD
发明人： KUDO MITSURU , MIURA KUNIAKI , FUKUSHIMA ISAO , ICHIMURA SHINYA , KANO KENJI
IPC分类号： H04N9/83 , H04N9/87

3. 发明专利

JPS6259379B2 失效
公开(公告)号：JPS6259379B2
公开(公告)日：1987-12-10
申请号：JP13850482
申请日：1982-08-11
申请人： HITACHI LTD
发明人： KOBORI YASUNORI , NISHIJIMA HIDEO , FUKUSHIMA ISAO , GOTO KATSUHIKO , ICHIMURA SHINYA , OIKAWA TADAYOSHI , KAWABATA HIROMI
IPC分类号： H04N5/7826 , G11B15/467 , G11B15/52 , G11B27/02

4. 发明专利

JPS5992686A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS5992686A
公开(公告)日：1984-05-28
申请号：JP20191682
申请日：1982-11-19
申请人： HITACHI LTD
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , ICHIMURA SHINYA
IPC分类号： G11B20/06 , H04N5/94
摘要： PURPOSE:To obtain a signal processing circuit capable of compensating a dropout deteriorating a signal by using a video dropout compensating circuit in addition to a dropout compensating circuit which performs dropout compensation only by an FM signal. CONSTITUTION:A video signal recorded after FM modulation is passed through a magnetic head 1 and an amplifier 2 to obtain a reproduced FM signal, which is converted by a frequency converting circuit 3 into a high-frequency converted FM signal. At this time, a dropout in the signal reproduced from a tape is detected by a dropout detecting and electronic switch control circuit 6. An electric switch 7 is changed over from a terminal 7-1 to a terminal 7-2 by the detection signal and a dropout-free signal which is delayed by 1H (one horizontal scanning period) through a 1H delay line 9 is applied to a terminal 7-3. A demodulator 8 and the 1H delay line have characteristic time lag, so the electronic switch 11 is controlled with proper time lag after the dropout is detected.

5. 发明专利

JPS5922203A Signal reproducing circuit 失效
标题翻译：信号再现电路
公开(公告)号：JPS5922203A
公开(公告)日：1984-02-04
申请号：JP13030782
申请日：1982-07-28
申请人： Hitachi Ltd
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , HIROSE KOUICHI , ICHIMURA SHINYA
IPC分类号： H04N5/92 , G11B5/027 , G11B5/035
CPC分类号： G11B5/035
摘要： PURPOSE:To obtain highly efficient and unexpensive reproduction equalizing circuit and inversion preventing circuit by arranging a variable gain amplifier in an automatic gain controlling circuit in front of the 1st and the 2nd filters. CONSTITUTION:A signal from an output electrode 39 having low-pass peaking characteristics of a surface acoustic wave filter SAW 36 has less carrier components of an FM luminance signal and many lower band components. On the contrary, a signal from an output electrode 38 having high-pass peaking characteristics has many carrier components of the FM luminance signal. Therefore, a signal level is detected by the output electrode 38 in order to actuate the automatic gain controlling circuit AGC 33 effectively. The signal level is detected by an amplifier 33-3 and a detector 33-2 and the amplifier 33-3 is used to compensate a signal attenuated by the SAW filter 36. A generally used detector is used for the detector 33-2 to apply DC voltage corresponding to the detected signal level to the variable gain amplifier 33-1 and control the signal level.
摘要翻译：目的：通过在第1和第2滤波器前面的自动增益控制电路中设置可变增益放大器，获得高效率和低成本的再现均衡电路和反转防止电路。构成：来自具有声表面波滤波器SAW 36的低通峰值特性的输出电极39的信号具有较少的FM亮度信号和许多较低频带分量的载波分量。相反，来自具有高通峰值特性的输出电极38的信号具有FM亮度信号的许多载波分量。因此，输出电极38检测信号电平，以有效地启动自动增益控制电路AGC 33。信号电平由放大器33-3和检测器33-2检测，并且放大器33-3用于补偿由SAW滤波器36衰减的信号。通常使用的检测器用于检测器33-2应用 DC电压对应于检测到的信号电平到可变增益放大器33-1并控制信号电平。

6. 发明专利

JPS60214403A Video tape recorder 失效
标题翻译：录像机
公开(公告)号：JPS60214403A
公开(公告)日：1985-10-26
申请号：JP7082084
申请日：1984-04-11
申请人： Hitachi Ltd
发明人： KODAMA KOUJI , ICHIMURA SHINYA
IPC分类号： G11B20/02 , G11B5/027 , G11B25/10 , H04N5/937
CPC分类号： G11B25/10
摘要： PURPOSE:To attain multi-function and high performance of a VTR by providing a comparatively inexpensive frame memory comprising a turning body turned at a constant speed in the frame period of a developing signal, a magnetic recording disc and a fixed head. CONSTITUTION:A rotary cylinder 1 is driven at a constant speed in a period the same as the frame period of a video signal by a motor 2 subjected to drive control. Thus, the magnetic recording disc 3 loaded to the rotary cylinder 1 is driven at a constant speed in a period the same as the frame period of the video signal. A recording signal for one frame's share is recorded on a recording track 8 for one circumference's share on the magnetic recording disc 3 turned in the frame period by applying a recording signal current for one frame's share to the fixed head 5 from a recording and reproducing circuit 7 at the recording of the VTR. The recorded signal is extracted continuously in the frame period from the fixed head 5 at the reproduction of the VTR and the video signal for one frame's share is reproduced continuously by processing the recorded signal at the recording and reproducing circuit 7.
摘要翻译：目的：通过提供相对便宜的帧存储器来实现VTR的多功能和高性能，该帧存储器包括在显影信号的帧周期中以恒定速度转动的转动体，磁记录盘和固定头。构成：通过进行驱动控制的电机2，与视频信号的帧周期相同的周期，以恒定速度驱动旋转圆筒1。因此，与视频信号的帧周期相同的周期，以恒定的速度驱动装载到旋转圆筒1的磁记录盘3。一帧共享的记录信号通过从记录和再现电路施加一帧共享的记录信号电流到固定磁头5而被记录在记录磁道8上，以便在帧记录盘3中一周的共享 7录制录像机。在VTR的再现时，从固定头5的帧周期连续提取所记录的信号，并且通过在记录和再现电路7处理记录信号来连续地再现一帧共享的视频信号。

7. 发明专利

JPS60169286A MAGNETIC REPRODUCING DEVICE 失效
公开(公告)号：JPS60169286A
公开(公告)日：1985-09-02
申请号：JP2282084
申请日：1984-02-13
申请人： HITACHI LTD
发明人： MIURA KUNIAKI , FUKUSHIMA ISAO , SHIOMI MAKOTO , ICHIMURA SHINYA
IPC分类号： G11B20/06 , H04N5/95
摘要： PURPOSE:To obtain a jitter correcting means leading to low cost and high performance by using an oscillated frequency of a VCO so as to modulate a high frequency portion of a reproduced luminance signal and providing nearly same jitter component as that of the reproduced luminance signal to the oscillated frequency of the VCO. CONSTITUTION:An FM luminance signal reproduced from a head 3 is amplified by a preamplifier 4 and the frequency is corrected by a peaking circuit 5. After the high frequency of an output of the peaking circuit 5 is converted at a high frequency converting circuit 11, one frequency is extracted by a BPF12 and demodulated by a demodulation circuit 6. On the other hand, a horizontal synchronizing signal (h) separated from the luminance signal by a synchronizing separator circuit 9 is compared for the phase with a reference signal hr at a phase comparator 15 and its output (v) is fed to the VCO17 via an LPF16. As a result, an output of the VCO17 has nearly the same jitter component as the reproduced luminance signal and the reproduced luminance signal is subject to high frequency conversion by a high frequency converting circuit 11 based on the signal, then the luminance signal suppressed with jitter component is obtained.

8. 发明专利

JPS5229923A ROTATION DRIVING APPARATUS 失效
公开(公告)号：JPS5229923A
公开(公告)日：1977-03-07
申请号：JP10580975
申请日：1975-09-01
申请人： HITACHI LTD
发明人： ICHIMURA SHINYA
IPC分类号： H02P29/04
摘要： PURPOSE:To shorten the lock-in time for a motor at the throw-in of a power source, as well as shorten the time required for stopping the motor at the interruption of the power source by the provision to the time limiting device.

9. 发明专利

JPS525213A VOICE AND PICTURE REPRODUCER 失效
公开(公告)号：JPS525213A
公开(公告)日：1977-01-14
申请号：JP8088375
申请日：1975-07-02
申请人： HITACHI LTD
发明人： YUMITE YASUSHI , ICHIMURA SHINYA , SUGIMOTO TOSHITAKA
IPC分类号： H04N5/928 , G11B20/02 , H04N5/78
摘要： PURPOSE:Voice and picture reproducer which allows simultaneous reproducing of the voice information and time-lapse stationary picture information recorded on one track of narrow band recording media.

10. 发明专利

JPS51150229A SOUND AND PICTURE RECEIVING DEVICE 失效
公开(公告)号：JPS51150229A
公开(公告)日：1976-12-23
申请号：JP7320775
申请日：1975-06-18
申请人： HITACHI LTD
发明人： YUMITE YASUSHI , ICHIMURA SHINYA , SUGIMOTO TOSHITAKA
IPC分类号： H04N7/00 , H04N7/12 , H04N19/00
摘要： PURPOSE:A device for receiving picture information of the frame-dropped static type and sound information which has been transmitted through a general narrorband transmission line to be used for sound transmission, including radiobroadcasting and wire broadcasting.

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