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1. 发明专利

JPS615630A FM RECEIVER 失效
公开(公告)号：JPS615630A
公开(公告)日：1986-01-11
申请号：JP12524384
申请日：1984-06-20
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KAWAMOTO MIKIHIKO , SEKIGUCHI SATOSHI
IPC分类号： H04B1/16
摘要： PURPOSE:To decrease the number of capacitors which transmit a detection output by obtaining a either of S-curve detection outputs of the FM detection output by using the FM detection output and a reference voltage which are antiphase with each other. CONSTITUTION:When a switch SW is connected to a contact (a) and a current shown by an arrow is in the audio frequency band, current variation at a point A is grounded and an output signal V0 responding to an audio signal is obtained from an operational amplifier A1. Simultaneously, a voltage developed at one terminal of a capacitor CA is supplied as an AFC signal to a local oscillation circuit 14. When the switch SW is switched to a contact (b), on the other hand, an output signal V0 which has the same amplitude and is antiphase with the signal at the point A appears at an output terminal Z, and the voltage developed at one terminal of the capacitor CA is supplied as the AFC signal to the local oscillation circuit 14. The output signal V0 from a terminal 7 is supplied to an FM demodulating circuit through a coupling capacity to obtain an R and an L signal.

2. 发明专利

JPS60223348A FM MULTIPLEX DEMODULATING CIRCUIT 失效
公开(公告)号：JPS60223348A
公开(公告)日：1985-11-07
申请号：JP7856584
申请日：1984-04-20
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： NAKAGAWA TADASHI , KAWAMOTO MIKIHIKO
IPC分类号： H03D1/22 , H04H1/00 , H04H20/47 , H04H40/45 , H04H40/54
摘要： PURPOSE:To prevent decrease in degree of separation of an L signal and an R signal without changing the duty ratio by detecting a level when a power supply voltage is decreased to drive a switching means. CONSTITUTION:When a level of a +Vcc power supply is decreased to a prescribed level or below, transistors (TRs) Q5, Q6 are driven into ON state. As a result, bases of TRs Q3, Q4 are connected forcibly to GND and the TRs Q3, Q4 are both turned off. That is, even when either of the TRs Q3, Q4 is turned off, the other TR is operated and there is no inconvenience that the duty ratio of the Q and Q' outputs is different. When the level of the +Vcc power supply is decreased, the oscillation of a flip-flop circuit is prevented, a stereophonic switch 12 is turned off completely by an output of an inverter 21, then no subcarrier signal is fed to a decoder 11. Thus, the degree of separation between R and L signals is not decreased in the stereo demodulation circuit.

3. 发明专利

JPS6019130A CAMERA EXPOSURE CONTROLLER 失效
公开(公告)号：JPS6019130A
公开(公告)日：1985-01-31
申请号：JP12607783
申请日：1983-07-13
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KAWAMOTO MIKIHIKO
IPC分类号： G03B7/097 , G03B7/091
摘要： PURPOSE:To automatize the exposure while securing the number of degrees of freedom in selection of parameters for determining the exposure by changing the relation between the exposure time for obtaining a correct exposure and an aperture. CONSTITUTION:An exposure time setting part Rv, an aperture setting part Rf, an operation switch part Sx, a photosensor PS, etc. are connected as control input devices of a camera exposure controller 10, and a shutter control mechanism 40 and an aperture control mechanism 42 are connected as output devices. The controller 10 consists of A/D converters 12, 14, and 16, D/A converters 18 and 20, operating circuits 22 and 24, a counter 26, a control signal generating circuit 30, writable RAMs 32 and 34, switching circuits S11, S12, and S2, etc. The exposure time for determining the exposure and the aperture are controlled variably and the combination between the exposure time and the aperture is changed, thereby performing various photographing.

4. 发明专利

JPS60160732A RECEIVER 失效
公开(公告)号：JPS60160732A
公开(公告)日：1985-08-22
申请号：JP1523884
申请日：1984-02-01
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KAWAMOTO MIKIHIKO , SEKIGUCHI SATOSHI
IPC分类号： H04B1/16 , H04B1/10
摘要： PURPOSE:To make the deflection of a signal sensitivity meter coincident with the muting operation of a voice output by applying muting also to an output of the signal sensitivity meter. CONSTITUTION:A mute signal VM attaining two kinds of controls as level muting and band muting is obtained to attain the muting. On the other hand, the mute signal VM is applied to a base of a transistor (TR) Q20 via a resistor RA and acts on the S meter 19. That is, when the mute signal VM is at a high level, in other words, the muting operation is performed and a voice output is not obtained, the TRQ20 is turned on and the S meter 19 is not deflected. When the mute signal VM is at a low level on the other hand, an output signal VE is given to the S meter 19 and an indication corresponding to the voltage level is obtained. Thus, the S meter 19 is not deflected when no voice output is obtained.

5. 发明专利

JPS6038936A RECEIVER 失效
公开(公告)号：JPS6038936A
公开(公告)日：1985-02-28
申请号：JP14651383
申请日：1983-08-12
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： KAWAMOTO MIKIHIKO , NAKAGAWA TADASHI
IPC分类号： H04B1/16 , H03J5/02 , H03J7/28
摘要： PURPOSE:To save a narrow band filter or the like being an externally mounted component in case of circuit integration by obtaining a sound signal and a so- called stop signal for conducting digital tuning from a synchronism detecting circuit. CONSTITUTION:In receiving a certain broadcast radio wave corresponding to a frequency dividing ratio M of a programmable divider 10, when the level of an intermediate frequency signal obtained from a frequency mixing circuit 3 of a PLL circuit comprising 7, 8, 9, 3, 16 and 17 is large and the signal is locked accurately to the output of a reference frequency oscillating circuit 5, its lock detecting signal indicates the automatic search of a broadcast station. On the other hand, accurate locking is impossible, a central processing unit 20 changes the frequency dividing ratio of the divider 10. Since the PLL circuits have a prescribed lock-in range or capture range and the synchronism detecting circuits 18, 18' detect the said relation of synchronism, no narrow band filter is required.

6. 发明专利

JPH04192906A AMPLIFIER CIRCUIT WITH METER CIRCUIT 失效
公开(公告)号：JPH04192906A
公开(公告)日：1992-07-13
申请号：JP32679690
申请日：1990-11-27
申请人： HITACHI LTD , HITACHI MICRO SYSTEM KK
发明人： SEKIGUCHI SATOSHI , OKUBO YUICHI , KAWAMOTO MIKIHIKO , FURUYA TOMIO , MATSUDA KATSUHISA
IPC分类号： G11B27/36 , G05F3/22 , H01L21/822 , H01L27/04 , H03G1/00
摘要： PURPOSE:To realize the both functions of an amplifier circuit and a meter circuit with a small number of elements by obtaining the meter signal of a direct current level by utilizing a reference bias generating circuit for generating the reference bias voltage of the amplifier circuit. CONSTITUTION:An amplifier circuit 1 is constituted by connecting the multiple steps of differential amplifiers A. A reference bias generating circuit 2 divides a power supply voltage Vcc to Vcc/2 by resistors R1 and R2, executes the buffering and amplifying of this voltage and supplies this amplified voltage to the circuit 1 as the bias voltage. A current detection circuit 3 detects a current Ia for the circuit 2 to generate the prescribed bias voltage Vcc/2 and this current Ia is outputted by an emitter follower composed of a transistor Q11 and a resistor R4 after being converted to a voltage by a resistor R3. This output is applied to the outside as a meter signal Mout for driving a level meter M. Thus, by utilizing the circuit 2 provided for generating the reference bias voltage Vcc/2 of the circuit 1, the signal Mout can be easily obtained.

7. 发明专利

JPS59182624A Switch circuit 失效
标题翻译：开关电路
公开(公告)号：JPS59182624A
公开(公告)日：1984-10-17
申请号：JP5514383
申请日：1983-04-01
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： SEKIGUCHI SATOSHI , KAWAMOTO MIKIHIKO , KATOU NORIHISA
IPC分类号： H01H47/00 , H03K17/18
CPC分类号： H03K17/18
摘要： PURPOSE:To use all switches of a switch circuit for interruption and switching of a signal transmission path by installing an LED to an input side of the switch circuit and lighting the LED without using the switch of the switch circuit itself. CONSTITUTION:A power supply as a control signal is applied to a coil L1 by turning on a switch S0. A current I1 flows also to an LEDD1 and a resistor R1 to light the LEDD1. Then, a switch S1 is turned on by a magnetic field generated from the coil L1 and a moving contact (c) of a switch S2 is changed over from a fixed contact (b) to a fixed contact (a). The coil L1 is energized by this circuit and the LEDD1 is lighted at the same time when the switches S1, S2 are activated, then the operating state of the switch circuit is confirmed by observing visually the light of the LEDD1.
摘要翻译：目的：使用开关电路的所有开关，通过将LED安装到开关电路的输入端并点亮LED而不使用开关电路本身的开关来中断和切换信号传输路径。构成：通过接通开关S0将作为控制信号的电源施加到线圈L1。电流I1也流向LEDD1和电阻器R1以点亮LEDD1。然后，开关S1由线圈L1产生的磁场导通，开关S2的移动触头（c）从固定触头（b）转换成固定触点（a）。线圈L1由该电路通电，并且在开关S1，S2被激活的同时LEDD1点亮，然后通过目视观察LEDD1的光来确认开关电路的工作状态。

8. 发明专利

JPH098580A REPRODUCTION EQUALIZER CIRCUIT 失效
公开(公告)号：JPH098580A
公开(公告)日：1997-01-10
申请号：JP17537595
申请日：1995-06-19
申请人： HITACHI LTD , HITACHI MICROCOMPUTER SYST
发明人： WATANUKI YUJI , YONETANI HIROYUKI , KAWAMOTO MIKIHIKO
IPC分类号： H03G5/24 , H03H11/48
摘要： PURPOSE: To incorporate a reproduction equalizer circuit into a semiconductor integrated circuit by including a feedback circuit by constituting the reproduction equalizer circuit by providing the feedback loop of a first operational amplifier circuit receiving the voice reproduction signal from a magnetic head with the capacity multiplying circuit composed by using a second operational amplifier circuit. CONSTITUTION: A reproduction equalizer circuit is composed by providing the feedback loop of a first operational amplifier circuit 2 receiving the voice reproduction signal from a magnetic head 1 with the capacity multiplying circuit 5 composed by using a second operational amplifier circuit 6. In order to obtain a desired equalizing characteristic with feedback resistances R1 and R2, an AC feedback circuit 3 is provided between the inversion input terminal and the output terminal of the operational amplifier circuit 2. In this AC feedback circuit 3, a resistance R3 and the capacity multiplying circuit 5 are used to realize the relatively large time constant corresponding to a voice signal by using the element which is possible to be formed in a semiconductor integrated circuit. Thus, the reproduction equalizer circuit can be incorporated into the semiconductor integrated circuit by including the feedback circuit.

9. 发明专利

JPS55100735A OSCILLATION CIRCUIT 失效
公开(公告)号：JPS55100735A
公开(公告)日：1980-07-31
申请号：JP707979
申请日：1979-01-26
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： KAWAMOTO MIKIHIKO , IENAKA MASANORI
IPC分类号： H03K3/013 , H03K3/0231
摘要： PURPOSE:To prevent a disturbance signal from mixing by forming in IC a method of stopping oscillation operation, by providing a switching transistor which supplies forcibly an OFF voltage to the base of a differential transistor on the output side. CONSTITUTION:When control signal Vc is low in level and transistor TrQ6 is OFF, an oscillation circuit composed of a couple of differential transistors TrQ1 and TrQ2, a current Miller circuit (TrQ3 and TrQ4), TrQ5, and capacitor C oscillates because the inverted voltage of the differential transistor circuit has hysteresis characteristics (Vvand VL). With control circuit Vc at a high level, TrQ6 is ON and differential transistor Q2 is forced to conduct, so that oscillation operation will stop.

10. 发明专利

JPH10241105A REPRODUCTION EQUALIZER CIRCUIT 失效
公开(公告)号：JPH10241105A
公开(公告)日：1998-09-11
申请号：JP5554697
申请日：1997-02-24
申请人： HITACHI LTD , HITACHI CHIYOU LSI SYS KK
发明人： YONETANI HIROYUKI , WATANUKI YUJI , KAWAMOTO MIKIHIKO
IPC分类号： G11B5/027 , G11B5/035 , H03G5/02
摘要： PROBLEM TO BE SOLVED: To provide a reproduction equalizer circuit realizing a simplified circuit while suppressing noise occurrence upon switching. SOLUTION: With respect to a negative feedback loop of a first operational amplifying circuit 2 which receives an audio reproduction signal from a magnetic head 1 for reproduction and recording, a capacitance duplicate circuit 4 is provided to include a first capacitor C1 and a second operational amplifying circuit 6 and equivalently double a capacitance value of the first capacitor C1. A second capacitor C2 and a switching element SW are further provided between an output node of the first capacitor C1 constituting the capacitance duplicate circuit 4 and an AC ground point. When the switching element SW is in an OFF state, an NAB characteristic c orresponding to a high position tape is set by the first capacitor C1 and the capacitance duplicate circuit 4. When the switching element SW is in an ON state, another NAB characteristic corresponding to a normal position tape is set by allowing a high frequency feedback amount to pass by the second capacitor C2.

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