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1. 发明专利

JPH10125013A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH10125013A
公开(公告)日：1998-05-15
申请号：JP27770296
申请日：1996-10-21
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： SATO YASUAKI , TAKAHASHI SHIGERU , TAGASHIRA TERUHIKO , SUNOU YUUJI , NAKAMOTO TOSHIO , TACHIBANA HIROAKI , OBARA YASUNARI
IPC分类号： G11B20/00 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To avoid digital recording by mistake even when a tape that is not suited for digital recording is used by providing a digital signal generator and an error rate detection device, etc. SOLUTION: This device has a digital signal generator 14 for measuring an error rate and an error detection device 15 for detecting the recorded state of digital signal recording/reproduction. Further, a function is provided to automatically judge whether signal is recorded in digital or in analog according to the measurement result of the error rate. As a result, when it is judged that digital recording is not possible based on the measurement result of the error rate of a cassette tape 4, digital recording is switched to analog recording, thus preventing malfunction where an image and an audio that a user requires cannot be recorded.

2. 发明专利

JPH1021502A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH1021502A
公开(公告)日：1998-01-23
申请号：JP17372896
申请日：1996-07-03
申请人： HITACHI LTD , HITACHI VIDEO IND INF SYST INC
发明人： OBARA YASUNARI , NAKAMOTO TOSHIO , TAKAHASHI SHIGERU , TAGASHIRA TERUHIKO , SATO YASUAKI , TORII HIROYUKI , YAMADA YOSHIO , TACHIBANA HIROAKI
IPC分类号： H04N5/765 , G11B5/02 , G11B5/027 , G11B20/00 , H04N5/781
摘要： PROBLEM TO BE SOLVED: To automatically select a signal to be recorded in a magnetic recording/reproducing device for recording/reproducing both of digital broadcast signal and analog signal. SOLUTION: This device includes a recording mode determining means 60 for deciding a signal to be recorded based on the kind of an inserted cassette or the existence of a recording digital signal from a receiving unit, a magnetic recording/reproducing unit 1 for recording/reproducing digital and analog signals and a digital broadcast signal receiving unit 100. In this case, in order to notify a user of a recorded analog signal or digital signal, a video outputted to a monitor television 200 according to a recording mode is made to be non-signal when necessary.

3. 发明专利

JP2005269559A Video signal transmission system, video signal output device, and video signal receiving device 审中-公开
标题翻译：视频信号传输系统，视频信号输出设备和视频信号接收设备
公开(公告)号：JP2005269559A
公开(公告)日：2005-09-29
申请号：JP2004083045
申请日：2004-03-22
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NAKAMOTO TOSHIO , YAMASHITA KAZUYA
IPC分类号： H04N5/205 , H04N7/08 , H04N7/081
摘要： PROBLEM TO BE SOLVED: To provide a video signal transmission system, capable of reliably and automatically correcting frequency characteristics for coping with attenuation due to cables, without incurring S/N degradation.
SOLUTION: When the frequency characteristics are corrected, in order to cope with attenuation due to cables, the attenuated amount of a signal is detected at the video signal receiving device side, and the frequency characteristics with the result of the signal reflected are corrected at the video signal output device side.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种能够可靠和自动地校正频率特性以应对由于电缆引起的衰减的视频信号传输系统，而不会引起S / N劣化。解决方案：当频率特性被校正时，为了应对由于电缆引起的衰减，在视频信号接收装置侧检测到信号的衰减量，并且反射的信号的频率特性是在视频信号输出装置侧进行校正。版权所有（C）2005，JPO＆NCIPI

4. 发明专利

JPH11296967A RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH11296967A
公开(公告)日：1999-10-29
申请号：JP9783398
申请日：1998-04-09
申请人： HITACHI LTD
发明人： NAKAJIMA AKIHIRO , ONO SHOJI , NAKAMOTO TOSHIO
IPC分类号： G11B20/12 , G11B5/02 , G11B15/10 , G11B20/00
摘要： PROBLEM TO BE SOLVED: To make combinations among plural recording systems and recording modes selectable with a simple operation by setting executable combinations among recording systems and recording modes obtained by logically judging plural recording mode information, recording media class information and copy protection information and successively updating set combinations based on the input signal of a recording selecting switch. SOLUTION: An input signal processing means 10 to which an analog recording system is instructed supplies an analog video signal to an analog video signal processing means 11 and supplies an analog voice signal to an analog voice signal processing means 12. Moreover, a changeover switch 9 to which the analog recording system is instructed from a recording system selecting means 15 inputs an analog voice signal which is converted into a recording format to voice recording magnetic head pair 2a, 2b by the analog voice signal processing means 12. When a digital recording system is selected, the input signal processing means 10 to which a digital recording system is instructed from the means 15 supplies digital video and voice signals.

5. 发明专利

JPH1011845A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH1011845A
公开(公告)日：1998-01-16
申请号：JP16270996
申请日：1996-06-24
申请人： HITACHI LTD
发明人： AMADA NOBUTAKA , OBARA YASUNARI , NAKAMOTO TOSHIO
IPC分类号： H04N5/7826 , G11B15/473 , H04N5/92
摘要： PROBLEM TO BE SOLVED: To record and reproduce a digital image signal to/from a common recording medium with a head constitution common to also conventional one while securing the compatibility with a conventional analog VTR. SOLUTION: At the time of recording/reproducing the digital image signal, a signal S.Ref made to be the reference for the speed and phase of a rotary drum is inputted through a changeover switch 415, meanwhile a changeover signal SW30Hz-A of the magnetic head for recording/reproducing the digital image signal is inputted through a changeover switch 427 respectively to a phase servo circuit 422. The phase difference between the reference signal S.Ref and the head changeover signal SW30Hz-A is detected in the phase servo circuit 422, and the detected phase difference signal is added with the speed difference signal from a speed servo circuit 421 by an adding circuit 423 and is returned to a drum motor through a motor driver. Thus, the rotary drum is phase- synchronized to the reference signal S.Ref.

6. 发明专利

JPH0944930A RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0944930A
公开(公告)日：1997-02-14
申请号：JP18877495
申请日：1995-07-25
申请人： HITACHI LTD
发明人： ITO ATSUSHI , NAKAMOTO TOSHIO
IPC分类号： G11B15/02 , H04N5/76
摘要： PROBLEM TO BE SOLVED: To reduce the operation to be performed by user by leaving the information such as on the recording time of the reserved video recording of a program as control information and, at the time of reproducing the program, and automatically the reproduction using the above information, thereby, making the program searching of the part, where a recording is to be started, unnecessary, at the time of performing a recording immediately after the program preserved and recorded. SOLUTION: A signal supplied from an input terminal 10 is recorded by operating a recording signal processing circuit 30 while using the information shown by a reserved recorder 20. At the time of reproducing the program subjected to reserved video recording, a reproduction control signal is generated using the information on the reproduction time stored in a reproduction time controller 40, and in accordance with the signal, a reserved reproduction device 50 is operated to judge whether reproduction is to be done or not, and to control a reproduced signal processing circuit 60. The reproduced signals are outputted from a terminal 70. And, it is possible to inform the user of the remaining recordable time by leaving that time as control information.

7. 发明专利

JPH08125975A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH08125975A
公开(公告)日：1996-05-17
申请号：JP25832394
申请日：1994-10-24
申请人： HITACHI LTD
发明人： NAKAMOTO TOSHIO , KUROKI YOSHIAKI , YATSUGI FUMISHIGE
IPC分类号： H04N5/93 , G11B15/467 , G11B23/44 , H04N5/956
摘要： PURPOSE: To provide a stable synchronizing signal even in any running mode of a magnetic tape. CONSTITUTION: This device is provided with a cylinder servo circuit 6 equipped with a function for generating an additional vertical synchronizing signal from a head switching signal, adder 9 for adding the additional vertical synchronizing signal and an additional horizontal synchronizing signal outputted from a time base correcting circuit 7, and switching circuit 10 for selecting either a normal synchronizing signal or the additional synchronizing signal added by the adder. At the time of normal reproduction, a synchronizing signal extracted from a regenerative signal is selected but at the time of high-speed reproduction, the additional synchronizing signal is selected. Thus, since the stable synchronizing signal can be provided at all times, the best regenerative picture can be always reproduced and on-screen characters can be always displayed at correct positions as well.

8. 发明专利

JPH10302345A ROTARY HEAD RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH10302345A
公开(公告)日：1998-11-13
申请号：JP10856397
申请日：1997-04-25
申请人： HITACHI LTD
发明人： NAKAMOTO TOSHIO , OBARA YASUNARI
IPC分类号： H04N5/91 , G11B15/14 , G11B15/473
摘要： PROBLEM TO BE SOLVED: To record/reproduce a digital signal in a control circuit for recording/ reproducing an analog signal by converting the reference signal of a frame cycle into a field cycle by using the omission correction of a vertical synchronous signal and comparing the phase of the reference signal with that of the frequency-divided reference signal. SOLUTION: A synchronous signal outputted from a digital signal processing circuit 33 is supplied through a changeover switch 10 to a vertical synchronous signal detector 4. A digital signal inputted to a recording/reproducing amplifier 34 is passed through a magnetic head 1 and then recorded in a magnetic tape. A complement pulse generator 5 determines the omission of a synchronous signal because an output from the vertical synchronous signal detector 4 is longer than the cycle of a vertical synchronous signal and generates a complement pulse in a position of about 16.68 mS from the edge of a 30 Hz signal. The complement pulse is added to the output from the vertical synchronous signal detector 4 and then its result is added to a frequency divider 6, and then digital signal recording is performed.

9. 发明专利

JPH06319101A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH06319101A
公开(公告)日：1994-11-15
申请号：JP1879593
申请日：1993-02-05
申请人： HITACHI LTD
发明人： TADA YUKINOBU , OKAMOTO CHIKAYUKI , NISHIJIMA HIDEO , KITADE TAKESHI , NAKAMOTO TOSHIO
IPC分类号： G11B5/027 , G11B15/18 , H04N5/783 , H04N5/93
摘要： PURPOSE:To attain the search reproduction at a higher speed by which a stable reproduced picture is obtained with simple configuration. CONSTITUTION:A reproduced video signal from a magnetic tape 26 running at a high speed is fed to a memory 12 and a synchronizing signal HS is separated from the video signal by a synchronizing signal detection circuit 5 and a write clock phiw synchronously with the synchronizing signal HS is obtained from an oscillator 8 being a component of a PLL. An oscillated frequency of the oscillator 8 is suitably equivalent to a running speed of the magnetic tape 26 based on speed information representing the running speed of the magnetic tape 26 from a tape speed arithmetic circuit 29. The write in the memory 12 is executed based on the write clock phiw and the read from the memory 12 is executed based on a read clock phir having a predetermined frequency from an oscillator 15. Moreover, the magnetic tape 26 is subject to reel drive from a drive source 21 in the high speed search reproduction mode and controlled by a reel control circuit 17 so that its running speed is made constant.

10. 发明专利

JPH04274045A TRACKING DEVICE 失效
公开(公告)号：JPH04274045A
公开(公告)日：1992-09-30
申请号：JP3583991
申请日：1991-03-01
申请人： HITACHI LTD
发明人： KANIWA KOUJI , NISHIJIMA HIDEO , NAKAMOTO TOSHIO
IPC分类号： G11B5/588 , G11B15/467
摘要： PURPOSE:To make the device highly integrated and to prevent the degradation of the performance by the dispersion of the constructing parts and secular change by performing all the digitalized processing for ATF control system including the pilot signal processing. CONSTITUTION:A sample and hold circuit 6 sample and holds the reproducing pilot signal supplied from LPE4 at the frequency of a common multiple of four-frequency pilot signal frequencies (example: 189fH) with the use of the clock from a clock generation circuit 8. An AD converter 7 digitalizes the sample and hold signal and data thinning circuits 9-12 thin out the reproduced pilot data so that they may become the sample frequencies of 1/29, 1/25, 1/20 and 1/18, respectively. fH-BPF 13-16 extract the fH signal component in the reproduced pilot signal where the sampling frequency is converted and supplies the component to a switch 18.

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