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1. 发明专利

JPS60223317A FILTER INTEGRATED CIRCUIT 失效
公开(公告)号：JPS60223317A
公开(公告)日：1985-11-07
申请号：JP7855484
申请日：1984-04-20
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： OKADA YOSHINORI , MIURA KUNIAKI , FUKUSHIMA ISAO , SASAKI MASAHIRO
IPC分类号： H03H11/12
摘要： PURPOSE:To attain miniaturization and light weight of an electronic circuit by combining a Twin-T circuit where the product between integrated circuit capacitance and integrated circuit resistance decides a trap frequency and an RC circuit where the product decides the cut-off frequency and using a variable capacitor as the integrated circuit capacitance. CONSTITUTION:In selecting resistors R1, R2, R3 of the Twin-T trap circuit 3 and variable capacitors C1, C2, C3 as R1=R2=2R3identicalR and C1=C2=C3/2identicalC, the trap frequency fT is expressed in Equation I. The cut-off frequency fc is expressed in Equation II in the positive feedback 2nd order LPF circuit 4. Thus, a signal outputted to an output pin 7 is the sum of response characteristics illustrated in Curves 8, 9 and a steep frequency characteristic is realized as shown in Curve 10. In changing a variable power supply V2 provided externally to the IC, since the n-channel potential of the variable capacitors C1-C6 is changed altogether via amplifiers K1, K2, a voltage VR across the variable capacitors C1-C6 is changed at the same time in the same rate.

2. 发明专利

JPH04207360A VTR-INTEGRATED CAMERA 失效
公开(公告)号：JPH04207360A
公开(公告)日：1992-07-29
申请号：JP32891890
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI MASAHIRO , UTO KAZUO , KUMAGAI TOSHIRO , KAMISAKI YASUNORI
IPC分类号： H04N5/232
摘要： PURPOSE:To match both of the picture contour of an electronic view finder and the picture contour recorded on a magnetic recording medium by detecting the difference between both picture contours and controlling the focal length of a lens. CONSTITUTION:A picture contour detecting circuit 9 is inputted with a video signal 13 of the picture contour of the electronic view finder 7 and outputs the picture contour signal 14. The presence or absence of the signals 12, 14 is discriminated by a picture contour signal discriminating circuit 10 and the result thereof is inputted as a control signal 15 to a control circuit 3. A lens driving circuit 2 is controlled in the control circuit 3 only when a switch 16 is on the side a. The picture contour of the electronic view finder when the switch 16 is on the side a can be set by previously determining the set value of the discrimination threshold value of the picture contour signal control circuit 10. The driving circuit 2 is put to the initial setting by putting the switch 16 to the side b at the time of recording. The picture contour of the video signal recorded on the magnetic recording medium and the picture contour view finder 7 are then matched or set at a certain ratio.

3. 发明专利

JPS6265578A LUMINANCE SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPS6265578A
公开(公告)日：1987-03-24
申请号：JP20429885
申请日：1985-09-18
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MITSUHAYASHI SHIYUNSUKE , OKADA YOSHINORI , SASAKI MASAHIRO , YONEYAMA TOSHIKATSU , SASAKI MOTOYOSHI
IPC分类号： H04N9/84 , H04N5/91 , H04N5/93
摘要： PURPOSE:To obtain a line correlation circuit in which the number of pins are reduced by giving a combination function to a IC pin. CONSTITUTION:A video signal inputted from a IC pin 1 is recorded on a magnetic tape through a video AGC circuit 15, a recording/reproducing change-over switch 9 and a LPF16, and passing through a trap circuit constituted with combination a trap and a recording/reproducing discrimination circuit 17 and a trapping block filter 12, and through a recording/reproducing change-over switch 11, an emphasis circuit 19, a frequency modulation circuit 20 and a magnetic head 13. A reproducing signal reproduced by a magnetic head 14 is introduced to a frequency demodulation circuit 21, a de-emphasis circuit 22, the switch 9, and the LPF16 and is outputted through a line correlation circuit 18, the switch 11 and a EE/PB AMP24. Since a IC pin 8 is used also as for a recording/reproducing, only one IC pin is enough for the IC pin that inputs the output signal of the IC pin 8.

4. 发明专利

JPS61292493A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS61292493A
公开(公告)日：1986-12-23
申请号：JP13448385
申请日：1985-06-20
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： OKADA YOSHINORI , FUKUSHIMA ISAO , MITSUHAYASHI SHIYUNSUKE , SASAKI MASAHIRO
IPC分类号： H04N9/793 , G11B5/027 , H04N9/79
摘要： PURPOSE:To require no adjustment of the recording current of a luminance signal and chrominance signal, to reduce adjusting process and to lower a cost by changing over the first and the second gain changeover means so as to increase and decrease the gain in reverse directions each other in accordance with an external mode changeover signal. CONSTITUTION:A luminance signal (b) separated from a video signal (a) is FM modulated in an FM modulating circuit 3, inputted to a variable gain amplifying circuit 16, and amplified by the gain according to an input control signal 17 in the circuit 16. An FM luminance signal is mixed with a low fre quency converting chrominance signal of an output of a chroma AGC circuit 23 in a mixing circuit 5, and supplied to magnetic heads 9, 10. In resistance 13, a recording current passing through the magnetic head 9 is detected, ampli fied by a fixed gain determined according to a mode change over signal 15 in the second gain change over circuit 19 and supplied to a synchronous period level detecting circuit 20. The output of the detecting circuit 20 is negatively fed back to the variable gain amplifying circuit 16 as a control signal 17 and an FM luminance signal level is controlled so as to be held at a certain level corresponding to a reference voltage source 22.

5. 发明专利

JPS60229417A FILTER INTEGRATED CIRCUIT 失效
公开(公告)号：JPS60229417A
公开(公告)日：1985-11-14
申请号：JP8402184
申请日：1984-04-27
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI MASAHIRO , OKADA YOSHINORI , MIURA KUNIAKI , FUKUSHIMA ISAO , KANARI SHIGEAKI
IPC分类号： H01L21/822 , H01L27/04 , H03H11/04 , H03H11/12
摘要： PURPOSE:To absorb the variance of integrated circuit capacitors and integrated circuit resistors and to ensure the performance by short-circuiting a collector layer and an emitter layer of n-channel semiconductor in the structure of integrated circuit capacitors C1, C2 and adopting the structure that a P-N junction capacitor is constituted between the short-circuit point and the base layer made of a P-channel semiconductor. CONSTITUTION:A variable capacitor is used as the integrated circuit capacitor and the structure of the variable capacitor is made difference so as not to produce a parasitic capacitor by the variable capacitor at the connecting point between two resistors and the variable capacitor in constituting a positive feedback secondary order LPF. For example, in a circuit of the positive feedback secondary LPF, the secondary LPF characteristic is realized by using resistors R1, R2, variable capacitors C1, C2 transistors Q2, Q5 and Q4, a constant current sources I1 and resistors R3, R4. A voltage VR impressed to the variable capacitors C1, C2 is changed from the outside of the IC by a voltage source V1 impressed to an IC pin 6, and the frequency is matched to a desired cut-off frequency by adjusting minutely the capacitors.

6. 发明专利

JPS60229416A INTEGRATED CIRCUIT FILTER 失效
公开(公告)号：JPS60229416A
公开(公告)日：1985-11-14
申请号：JP8402084
申请日：1984-04-27
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI MASAHIRO , OKADA YOSHINORI , MIURA KUNIAKI , FUKUSHIMA ISAO
IPC分类号： H03H11/12 , H03H3/04 , H03H11/04
摘要： PURPOSE:To correct accurately variance in the characteristic of the titled filter by trimming a module so as to correct the variance of the frequency characteristic of an integrated circuit filter and setting a trimming adjusting point between the cut-off frequency and the trap frequency. CONSTITUTION:In adjusting the trimming at the cut-off frequency fc of the LPF, when the LPF has a variance in the range between doted lines 7 and 8, the change in the response is a range shown in (a). In selecting the trimming adjusting point of a frequency ft between the cut-off frequency and the trap frequency, the change in the response is in the range shown in (b) and the response with a wide change is obtained. The change width of the response due to the variance in the filter characteristic is made wider by setting the trimming adjusting point to the vicinity of the trap frequency, but since the signal level is small, the measured error is apt to be produced and accurate adjustment becomes difficult. Thus, it is desirable to set the adjustment point of trimming nearly between the cut-off frequency and the trap frequency.

7. 发明专利

JPS6079815A FILTER INTEGRATED CIRCUIT 失效
公开(公告)号：JPS6079815A
公开(公告)日：1985-05-07
申请号：JP18691383
申请日：1983-10-07
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： OKADA YOSHINORI , MIURA KUNIAKI , FUKUSHIMA ISAO , SASAKI MASAHIRO
IPC分类号： H03H11/04 , H01L29/93 , H03H7/06 , H03H11/12
摘要： PURPOSE:To average variation in capacitance and resistance of an integrated circuit and also to ensure the performance by using a varicap diode as an integrated-circuit capacitor and also adopting different structure for at least one of three varicap diodes. CONSTITUTION:The trap characteristic is formed by resistors R1-R3 and varicap diodes C1-C3 in a Twin-T circuit. A collector layer 3 made of an n-channel semiconductor is connected to a Vcc in the structure of the varicap diodes C1, C2 and a junction between a base layer 2 comprising a p-channel semiconductor and an emitter layer 1 comprising an n-channel semiconductor is used as a capacitor. A structure different from the former structure is used as a varicap diode C3. Thus, a filter integrated circuit without parasitic capacitance to points 15, 16 to which the resistors R1-R3 and the varicap diodes C1-C3 deciding the trap characteristic are connected and without deterioration in the trap characteristic is obtained.

8. 发明专利

JPS63250841A MANUFACTURE OF MONOLITHIC INTEGRATED CIRCUIT 失效
公开(公告)号：JPS63250841A
公开(公告)日：1988-10-18
申请号：JP8474887
申请日：1987-04-08
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： MINAMI TOKUO , SASAKI MASAHIRO , KANARI SHIGEAKI
IPC分类号： H01L21/82 , H01L21/822 , H01L21/8222 , H01L21/8234 , H01L27/04 , H01L27/06 , H01L27/08 , H01L27/088 , H01L27/118
摘要： PURPOSE:To convert an analog circuit into a monolithic IC in a short time by a method wherein a wafer (master wafer) is allowed beforehand to be mounted with transistors so that an IC development work may dispense with the process of incorporating transistors into a wafer. CONSTITUTION:A wafer 20 is equipped only with transistors during a process ranging from a wafer stage 1 through emitter diffusion stage 13. For every IC developed, a master wafer 20 is used whereon transistors have uniformly been arranged on chips and whereon resistors 22 and wirings 15 have already been arranged suiting the respective circuits, which completes the wafer stage 1. This allows an IC development work, which conventionally incorporates a transistor building process, to dispense with such for the shortening of the wafer processing. Other processing stages may also be shortened, greatly reducing the time required for IC development.

9. 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

10. 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.

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