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1. 发明专利

DE3650110D1 未知
公开(公告)号：DE3650110D1
公开(公告)日：1994-12-01
申请号：DE3650110
申请日：1986-03-18
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , FUKUSHIMA ISAO , MORO EIJI , KANENARI SHIGEAKI
IPC分类号： H03L7/08 , H03H11/04 , H03L7/06

2. 发明专利

DE3650110T2 未知
公开(公告)号：DE3650110T2
公开(公告)日：1995-06-08
申请号：DE3650110
申请日：1986-03-18
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , FUKUSHIMA ISAO , MORO EIJI , KANENARI SHIGEAKI
IPC分类号： H03L7/08 , H03H11/04 , H03L7/06

3. 发明专利

JPH0644804B2 失效
公开(公告)号：JPH0644804B2
公开(公告)日：1994-06-08
申请号：JP25854885
申请日：1985-11-20
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI MASAHIRO , OKADA YOSHINORI , MIURA KUNIAKI , OTSUKA SUSUMU , MORO EIJI
IPC分类号： H04N5/208

4. 发明专利

JPS62120168A LUMINANCE SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS62120168A
公开(公告)日：1987-06-01
申请号：JP25854885
申请日：1985-11-20
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI MASAHIRO , OKADA YOSHINORI , MIURA KUNIAKI , OTSUKA SUSUMU , MORO EIJI
IPC分类号： H04N5/208
摘要： PURPOSE:To perform sync expansion and waveform shaping at the same circuit by adding a capacitance at the emitter end of an output terminal transistor in a sync expansion circuit connected to the input terminal of a quadratic differential type outline enhancement circuit. CONSTITUTION:An input compound video signal, before it is inputted to a quadratic differential type of outline enhancement circuit IC17, is inputted to a combination sync expansion and a waveform arrangement circuit 27. An input video signal is clamped with a transistor Q1, and a current is withdrawn only at a sync chip part with a differential amplifier consisting of transistors Q2 and Q3, and the sync expansion is performed. A resistor R and a capacitor C added on the emitter of an output transistor Q4 in the differential amplifier enhance the trailing edge of the sync chip part, and by adding the signal and the output signal of the IC17, the waveform of the sync chip part can be shaped.

5. 发明专利

JPS61214615A INTEGRATED CIRCUIT 失效
公开(公告)号：JPS61214615A
公开(公告)日：1986-09-24
申请号：JP5463685
申请日：1985-03-20
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , FUKUSHIMA ISAO , MORO EIJI , KANARI SHIGEAKI
IPC分类号： H03L7/08 , H03H11/04 , H03L7/06
摘要： PURPOSE:To make it unnecessary to execute an adjustment, and to secure a desired characteristic by using a variable capacity capacitor as a capacitor, controlling a variable capacitor of an electronic circuit by a phase detecting output obtained by a phase lock loop circuit, and absorbing a variance of a characteristic of the electronic circuit. CONSTITUTION:A reference signal of a prescribed frequency f0 outputted from a reference oscillator 16, and a signal of a frequency (f) outputted from a voltage control oscillator 18 are supplied to a phase detector and brought to a phase detection, a detected output voltage is smoothed by a lowpass filter 22 and an unnecessary component is eliminated, and it is supplied as a control voltage to the voltage control oscillator 18. In the voltage control oscillator 18, a variable capacity capacitor is controlled by this control voltage, and an electrostatic capacity of this variable capacity capacitor is set so that its oscillation frequency (f) becomes equal to the frequency f0 of the reference signal. That is to say, the electrostatic capacity of the variable capacity capacitor is varied by the control voltage, the frequency (f) and f0 are made to coincide with each other, and a variance of the resistance value and the electrostatic capacity is absorbed by the variable capacity capacitor. In this way, an electronic circuit which requires no adjustment from the outside can be converted to an IC.

6. 发明专利

JPS62249576A VIDEO SIGNAL REPRODUCING AND AMPLIFYING CIRCUIT 失效
公开(公告)号：JPS62249576A
公开(公告)日：1987-10-30
申请号：JP9216286
申请日：1986-04-23
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： OHASHI SHINICHI , SHIINA FUMIO , TOEDA HIROSHI , MORO EIJI
IPC分类号： G11B5/027 , H03F1/26 , H04N5/93
摘要： PURPOSE:To form a video signal reproducing and amplifying circuit reducing the generation of noise by using a capacitor element instead of a negative feedback resistor element to be a braking resistor element. CONSTITUTION:A capacitor C2 is used instead of the braking resistor. Generally, transmission characteristics are changed by substituting the resistor by the capacitor. Thereby, an amplifier having characteristics equivalent to the case using the braking resistor. To obtain the equivalent transmission characteristics, the frequency characteristics of the gain A of an amplifier are changed. Consequently, an amplifier having the characteristics equivalent to the case using the braking resistor can be obtained. In this case, since the braking registor is not used, the amplifier having no thermal noise is obtained. Since an input signal is not attenuated due to the braking resistor, the influence of the internal noise of the amplifier circuit can be reduced. Thus, the video signal reproducing and amplifying circuit reducing its noise can be formed.

7. 发明专利

JPS61276492A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS61276492A
公开(公告)日：1986-12-06
申请号：JP11646185
申请日：1985-05-31
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , OKADA YOSHINORI , MORO EIJI , KANARI SHIGEAKI
IPC分类号： H04N9/78 , H04N9/79 , H04N9/793 , H04N9/83 , H04N9/84
摘要： PURPOSE:To make it possible to widen band of luminance signals using necessary minimum IC pin by using a comb-shaped filter and an amplifier for processing carrierchrominance signals and for widening band of luminance signals. CONSTITUTION:In a VTR, when switches 70, 71 of an IC 60 for processing luminance signal and an IC 61 for processing carrier chrominance signal are connected to a contact R side at the time of recording, a Y type comb-shaped filter is formed of an amplifier 35, a comb-shaped filter 32, an attenuator 49, an amplifier 36 and an extending device 53, and the band of an LPF 3 is widened and the band of luminance signals is widened. On the other hand, at the time of reproduction, switches 70, 71 are connected to a contact P, and reproduced carrier chrominance signals from a burst signal reducing circuit 31 are processed by the amplifier 35, filter 32 and amplifier 36 etc. Accordingly, by increasing three necessary minimum pins 62-64 and increasing switches 70, 71 etc., without increasing the number of IC, parts are used in common, and widening process of band of luminance is made possible, and constitution of the VTR can be simplified.

8. 发明专利

JPH02266689A GAIN CONTROL CIRCUIT 失效
公开(公告)号：JPH02266689A
公开(公告)日：1990-10-31
申请号：JP8683789
申请日：1989-04-07
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MORO EIJI , ARIMA HIROAKI
IPC分类号： H04N9/83 , H03H17/08 , H04N5/205 , H04N9/793 , H04N9/87
摘要： PURPOSE:To correct the deterioration in the band characteristic of an orthogonal biphase modulation chroma signal by changing the gain at other desired frequency properly while the gain at a desired frequency is kept constant. CONSTITUTION:The gain control circuit consists of an input terminal 1, an output terminal 2, delay elements 3, 4, an attenuator 5, an amplifier 6, and adders 7-9. In the transmission characteristic Ha(jomega) represented in equation I, the same phase versus frequency characteristic as that of the signal of a delay time of Tsec with respect to an input signal is provided and a group delay versus frequency characteristic is made flat and equal to the delay time T, then phase characteristic and the group delay characteristic of the signals formed by the addition and substraction of the signals show the similar characteristic. Then the characteristic is used to change the band characteristic of the orthogonal biphase modulation chroma signal. Then the deterioration in the band of the orthogonal biphase modulation chroma signal is corrected without causing a disadvantage such as deterioration in the group delay characteristic.

9. 发明专利

JPS62143521A PHASE LOCKED LOOP 失效
公开(公告)号：JPS62143521A
公开(公告)日：1987-06-26
申请号：JP28292985
申请日：1985-12-18
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MORO EIJI , SHIOMI MAKOTO , KANARI SHIGEAKI
IPC分类号： H03L7/085 , H03L7/06 , H03L7/08 , H03L7/10
摘要： PURPOSE:To sufficiently suppress high-frequency ripples, by using an operation type filter composed of two phase shifting circuits, two multipliers, and an adder or subtractor as a phase comparator. CONSTITUTION:The output signal upsiloni of a reference oscillator 1 and output signal upsilon0 of a VCO 8 are supplied to a multiplier 4 and a multiplied output upsilona is obtained. Moreover, these output signals upsiloni and upsilon0 are also supplied to another multiplier 5 after their phases are respectively shifted by +90 deg. by phase shifting circuits 2 and 3 and a multiplied output upsilonb is obtained. These multiplied outputs upsilona and upsilonb are added to each other by an adder 6 and a phase-difference voltage upsilone is obtained. Since the phase-difference voltage upsilone has the frequency difference component between the output signals upsiloni and upsilon0 only, it is sufficient to consider the passing characteristic to the frequency difference component at an LPF 7. Therefore, a reference oscillator is never affected by high-frequency ripples and the characteristic of the low pass filter 7 can be set by considering only loop characteristics, such as locking characteristic, transient response characteristic, frequency pulling-in range, etc., and PLL characteristics can be improved.

10. 发明专利

JPS621321A NONADJUSTABLE VOLTAGE CONTROLLED OSCILLATOR 失效
公开(公告)号：JPS621321A
公开(公告)日：1987-01-07
申请号：JP13917985
申请日：1985-06-27
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SHIOMI MAKOTO , MIURA KUNIAKI , FUKUSHIMA ISAO , MORO EIJI , KANARI SHIGEAKI
IPC分类号： H03L7/08 , H03B1/00 , H03B5/12 , H03L7/099
摘要： PURPOSE:To attain nonadjustment of an oscillation center frequency by using a system correcting automatically the variation of resistance values and capacitance values in an IC deciding the oscillated center frequency and the oscillation frequency sensitivity so as to correct autonomously the variation of the capacitance and resistance in the IC. CONSTITUTION:The oscillation frequency F of a voltage controlled oscillator (VCO) 75 depends on the ratio of the resistance in the inside to an internal resistance of a reference potential generating circuit 91 and a product CR (R=R1//R2) obtained by multiplying the capacitance by the resistance. On the other hand, the oscillation frequency (f) of the VCO 73 is equal to a reference frequency f0 and the oscillation frequency F of the VCO 75 depends on the ratio of 1/R0 to (1/R1+1/R2). Further, the oscillation frequency sensitivity depends on the said resistance ratio and the product CR2 between the capacitance and the resistance. The variation in the CR2 is corrected by using the said self-correction system.

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