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1. 发明专利

DE3664240D1 STILL PICTURE REPRODUCING SYSTEM FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS 未知
公开(公告)号：DE3664240D1
公开(公告)日：1989-08-10
申请号：DE3664240
申请日：1986-02-13
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI VIDEO ENGINEERING CO
发明人： SEKIYA MASATAKA , NISHIJIMA HIDEO , OKAMOTO KANEYUKI , FUKUSHIMA ISAO , FUJII FUMIAKI , SERA KATSUMI , FURUTANI TAKASHI
IPC分类号： H04N5/93 , G11B15/18 , H04N5/783 , H04N5/937
摘要： The system sends one frame in order to shift a reproduction mode from ordinary reproduction to reproduction of a still picture by use of so-called "fine slow", sends one more frame if a noise is detected on a picture at this time, and stops if no noise is detected.

2. 发明专利

DE3571167D1 AUTO-TRACKING METHOD AND APPARATUS OF A MAGNETIC RECORDING/REPRODUCING APPARATUS 未知
公开(公告)号：DE3571167D1
公开(公告)日：1989-07-27
申请号：DE3571167
申请日：1985-07-16
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： KOBORI YASUNORI , NISHIJIMA HIDEO , OKAMOTO KANEYUKI , FUKUSHIMA ISAO , GOTO KATSUHIKO , TAKAHASHI TAKASHI
IPC分类号： G11B5/588 , G11B15/467
摘要： An auto-tracking method and apparatus of a magnetic recording/reproducing appartus are disclosed. The apparatus comprises: a reference signal generator (9) for generating a reference signal (REF); a rotary cylinder driver (3, 5) for rotating, synchronously with the reference signal, a rotary cylinder to which magnetic heads are attched; a head switching signal generator (16, 17) for detecting a rotational phase of the rotary cyliner and outputting a head switching signal (HS) representative of this detected rotational phase; a reproduction signal envelope level detection circuit (13, 14) for sampling and detecting the envelope levels of the reproduced signals derived by the magnetic heads at timings corresponding to the head switching signal; a tape running apparatus (2, 6) for driving a magnetic tape at a phase difference designated with respect to the rotational phase of the magnetic heads; a reference signal delay circuit (10, 11) for generating a delay reference signal (DREF) to control the tape running apparatus on the basis of the reference signal, in which the delay reference signal is derived by delaying the reference signal by an arbitrary time; and means for conrolling the reference signal delay circuit (12) on the basis of the head switching signal and the detected envelope levels of the reproduced signals in a manner that the reference signal delay circuit first changes the run of the magnetic tape at a rough step within a tracking phase range of 2 1 r and thereby detecting the roughly searched maximum envelope level of the reproduced signals, and then changes the run of the magnetic tape at a fine step within a tracking phase range which is narrower than 2π and which includes the running phase of the magnetic tape corresponding to the roughly searched maximum envelope level and thereby detecting the finely searched maximum envelope level, and thereby allowing the magnetic tape to run at the phase corresponding to the finely searched maximum envelope level. With this apparatus, the best tracking state can be accurately and certainly obtained in a short time.

3. 发明专利

DE3277105D1 SIGNAL VOLTAGE DIVIDING CIRCUIT 未知
公开(公告)号：DE3277105D1
公开(公告)日：1987-10-01
申请号：DE3277105
申请日：1982-05-05
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： FUKUSHIMA ISAO , KUWAHARA KAZUYOSHI , NISHIJIMA HIDEO , KOBORI YASUNORI , ITOIGAWA KEIICHI
IPC分类号： H03H19/00
摘要： A signal voltage dividing circuit in which two switched capacitors (7, 14) each including an input terminal (18, 10), an output terminal (19, 21) and a capacitor (8, 15) connected selectively to the input terminal (18, 10) or the output terminal (19, 21) are connected in series and driven in opposite phase with each other. A holding capacitor (17) is connected between the junction of the two switched capacitors (7, 14) and a reference potential. An input signal is supplied across the two switched capacitors (7, 14) to produce a divided output signal from the junction of the two switched capacitors (7, 14).

4. 发明专利

DE3370106D1 MOTOR DRIVING CIRCUIT 未知
公开(公告)号：DE3370106D1
公开(公告)日：1987-04-09
申请号：DE3370106
申请日：1983-03-30
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： NISHIJIMA HIDEO , SERA KATSUMI , FUKUSHIMA ISAO , KOBORI YASUNORI
IPC分类号： H02P3/06 , H02P6/04 , H02P6/06 , H02P6/08 , H02P6/24 , H02P3/12 , H02P3/22
摘要： A motor driving circuit in which the opposite ends of the motor driving coils (4) of a video tape recorder (VTR) capstan motor are shorted by a group of switching elements (12-17) when a control input voltage generated from a rotation detec- tion/oscillator (6) is in a predetermined range.

5. 发明专利

DE3373248D1 FREQUENCY-VOLTAGE CONVERTER 未知
公开(公告)号：DE3373248D1
公开(公告)日：1987-10-01
申请号：DE3373248
申请日：1983-04-21
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： KOBORI YASUNORI , FUKUSHIMA ISAO , NISHIJIMA HIDEO , MASUDA YOSHINORI , YAMAMOTO NORIHISA
IPC分类号： H02P29/00 , G11B15/46 , H03K9/06
摘要： A frequency-voltage converter comprising a feedback frequency generating means (3) associated with controlled means (2, 11), a saw-tooth wave generating means (5, SW17, SW 19, 20), a current source (7) for the saw-tooth wave (SAW), pulse generating means (NFC, PC1, PC2) and sample-and-hold means (SW 18, 21), the frequency-voltage converter being characterized by further provision of supply voltage switching means (VC, RV, R) for changing the feedback frequency of the controlled means by changing the voltage (V R ) to be supplied to the current source to change the current from the current source and to thereby the slope of the saw-tooth wave from the saw-tooth wave generating means.

6. 发明专利

JPS61269512A MONOSTABLE MULTIVIBRATOR 失效
公开(公告)号：JPS61269512A
公开(公告)日：1986-11-28
申请号：JP11040085
申请日：1985-05-24
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG , HITACHI VIDEO ENG
发明人： SERA KATSUMI , FURUYA TAKASHI , NISHIJIMA HIDEO , TAKAHASHI TAKASHI
IPC分类号： H03K3/0232 , H03K3/023
摘要： PURPOSE:To form an accurate delay time to a trigger signal even with a short period by providing a saturation preventing circuit to a change/discharge transistor (TR) for a capacitor of a time constant circuit setting a delay time. CONSTITUTION:When a monostable multivibrator changes from an astable state to a stable state, a Q output of an FF 1 changes from H to L. In this case, TR 3 is turned on to start discharging the electric charge stored in a capacitor 4 and the collector voltage is decreased. Since a series circuit comprising a diode 9 and a constant voltage power supply V3 10 is connected to the collector, the collector voltage is not decreased below V3-VF, where VF is an on-voltage of the diode 9. In setting the value of the power supply V3, the saturation of the TR 3 is prevented to be acted at the active region, thereby blocking the decrease in the current amplification factor of the TR 3. The discharge current is made constant, the terminal voltage of the capacitor 4 is decreased linearly and stays at a voltage V3-VF. Then the discharge time in this case is shortened sufficiently.

7. 发明专利

JPS5998341A DELAYING CIRCUIT 失效
公开(公告)号：JPS5998341A
公开(公告)日：1984-06-06
申请号：JP20612982
申请日：1982-11-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： NISHIJIMA HIDEO , OKAMOTO CHIKAYUKI , SERA KATSUMI
IPC分类号： H04N5/783 , G11B15/46 , G11B15/467
摘要： PURPOSE:To simplify the switching of a time constant circuit of a delaying circuit by dividing said circuit into the first delaying circuit part whose delay amount is changed by plural mode control signals, and the second delaying circuit for executing a delay of a fixed amount, and combining them suitably. CONSTITUTION:A delaying circuit of a control CTL signal of recording and reproducing is divided into the first delaying circuit whose delay amount is changed by a mode, and the second delaying circuit having a fixed delay amount. As a result, the delay amount of each mode of the first delaying circuit can be made to have regularity, therefore, by combining suitably the first and the second delaying circuits, a simple delaying circuit of the CTL signal of recording and reproducing can be formed. That is to say, in this way, the switching of a time constant circuit of the delaying circuit can be simplified. Also, points to be adjusted can be reduced remarkably.

8. 发明专利

JPS6276816A POWER SUPPLY CIRCUIT FOR IIL CIRCUIT 失效
公开(公告)号：JPS6276816A
公开(公告)日：1987-04-08
申请号：JP21507085
申请日：1985-09-30
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： ITO TAKAYASU , NISHIJIMA HIDEO , TAKAHASHI TAKASHI , JINNO KEIJIRO
IPC分类号： H01L27/04 , H01L21/822 , H01L21/8222 , H01L21/8226 , H01L27/08 , H01L27/082 , H03K19/00 , H03K19/091
摘要： PURPOSE:To obtain a power supply circuit having a required minimum supply power with high efficiency by providing a means controlling a variable voltage source and a start means of the variable voltage source to constitute a feedback loop and supplying the require minimum power to an IIL circuit section placed in the same integrated circuit as a voltage controlled oscillator. CONSTITUTION:Since the propagation delay time of an IIL inverter is in variation by the current supplied to an injector terminal 6, when the current is decreased, the oscillated frequency is changed in the decreasing direction and this output is inputted to one of phase comparison means 23. A reference frequency in response to the maximum operating frequency used in the IIL circuit section 17 is inputted to a terminal 19 as other input to the phase comparison means 23 and the oscillated frequency of the voltage controlled oscillator 16 is matched with a reference frequency 35, the oscillating frequency of the voltage controlled oscillator 16 is set with high accuracy. Thus, the propagation delay time per gate of the IIL circuit section 17 is controlled with high accuracy and the circuit including the IIL circuit section is subject to power saving greatly.

9. 发明专利

JPS60241328A INTERFACE CIRCUIT 失效
公开(公告)号：JPS60241328A
公开(公告)日：1985-11-30
申请号：JP9653384
申请日：1984-05-16
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： SEKIYA MASATAKA , KOBORI YASUNORI , OKAMOTO CHIKAYUKI , NISHIJIMA HIDEO , TAKAHASHI TAKASHI
IPC分类号： H03K19/018
摘要： PURPOSE:To make a driving current equal to an injector current by using the current of a constant current source circuit when the driving current is supplied to a logic circuit in accordance with the input signal from a linear circuit. CONSTITUTION:When an NPN transistor (TR) 12 is turned on in accordance with the input signal supplied to an input terminal 20, a driving current equal to the injector current of an I L circuit 16 having injector is supplied to an I L circuit 15 having no injector. As the result, a duty ratio of the inut signal supplied to the I L circuit 15 having no injector and that of the output signal of the I L circuit 16 having injector are equal to each other.

10. 发明专利

JPS5997283A CONTROL CIRCUIT OF MAGNETIC RECORDER AND REPRODUCER 失效
公开(公告)号：JPS5997283A
公开(公告)日：1984-06-05
申请号：JP20613082
申请日：1982-11-26
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： OKAMOTO CHIKAYUKI , KOBORI YASUNORI , NISHIJIMA HIDEO , FUKUSHIMA ISAO , SERA KATSUMI
IPC分类号： H04N5/783 , G11B15/18 , G11B15/467
摘要： PURPOSE:To prevent the malfunction at switching when a single monostable multivibrator is operated by plural trigger sources, by producing a pulse train eliminating one pulse at a point of time of switching. CONSTITUTION:A magnetic tape is driven intermittently by utilizing a control signal representing track position to realize slow motion reproduction. The circuit includes trigger pulse generators 1, 2, monostable multivibrators 4, 37, output detectors 6, 7, flip-flops 20, 35, a pulse generator 36, a capstan motor 39 and its drive circuit 38. A control signal is considered as an output of the pulse generator 1, a switch 8 changes over the standard reproduction and the slow motion reproduction. A signal missing a control pulse only determining the switching timing of a control signal 24 is produced as an output of an OR gate 34. This control signal is applied to a monostable multivibrator as a slow control means.

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