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1. 发明专利

JPS59148409A Amplifier 失效
标题翻译：放大器
公开(公告)号：JPS59148409A
公开(公告)日：1984-08-25
申请号：JP2158983
申请日：1983-02-14
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： SATOU TETSUO , ICHIKAWA YOSHIHISA
IPC分类号： H03F1/00
摘要： PURPOSE: To attain surely silencing operation with electronic circuit constitution by grounding an output of an amplifier in terms of AC before a transistor(TR) in the amplifier is driven into a saturated region after the interruption of power supply.
CONSTITUTION: When the power supply is interrupted, a power supply voltage +V
cc is decreased comparatively rapidly, but the potential at a common connecting point of bias resistors R
1 , R
2 is decreased slowly because a capacitor C
4 for power supply ripple elimination is connected to the connecting point. On the other hand, a potential at a terminal 2 (output terminal of amplifier) is made almost equal to that at a terminal 5 by negative feedback via resistors R
4 , R
5 . As a result, when the difference of potentials at terminals 2 and 3 reaches a prescribed value, a TRQ
11 is turned on, a base current flows to a TRQ
12 and the TRQ
12 is turned on. Thus, the rapid current change in an output signal being a cause to the generation of pop tone flows to ground via a capacitor C
3 .
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过在放大器的晶体管（TR）在电源中断之后将晶体管（TR）驱动到饱和区域之前，通过将放大器的输出端接地来实现电子电路结构的可靠的消音操作。构成：当电源中断时，电源电压+ Vcc相对较快地降低，但是偏置电阻R1，R2的共同连接点的电位缓慢下降，因为用于电源纹波消除的电容器C4连接到连接点。另一方面，端子2（放大器的输出端子）的电位与端子5的电位大致相等，通过电阻R4，R5的负反馈。结果，当端子2和3的电位差达到规定值时，TRQ11导通，基极电流流向TRQ12，TRQ12导通。因此，作为产生流氓音的原因的输出信号的快速电流变化经由电容器C3流到地。

2. 发明专利

JPS59182635A Communication circuit 失效
标题翻译：通讯电路
公开(公告)号：JPS59182635A
公开(公告)日：1984-10-17
申请号：JP5513883
申请日：1983-04-01
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： ICHIKAWA YOSHIHISA , SATOU TETSUO
IPC分类号： H04B3/06 , H03G3/20 , H04M1/76
CPC分类号： H03G3/3005 , H04M1/76
摘要： PURPOSE:To attain stable communication by providing an automatic gain control circuit to correct the attenuation of signal at signal transmission. CONSTITUTION:A sound signal fs of a transmission microphone 2 is applied to an amplifier 4 via an attenuator 3 and its output signal f0 is applied to an output circuit 5. Further, the signal f0 is applied to a diode D1 to obtain a control voltage Vd corresponding to the signal f0, a resistance value of the attenuator 3 is controlled so as to uniform an input signal fs of the amplifier 4 and also the signal f0 similarly. Thus, even if the signal fs of the amplifier 4 is small, the level of the signal f0 is not lowered. Then, the signal f0 is transmitted to a communication line l1, and when the line l1 is a long distance line and the signal f0 is attenuated, an output signal f0' is boosted by providing an AGC circuit 1'. The level change in the signal fs is uniformed by providing the AGC circuits 1, 1' in this way, the attenuation of the communication line is corrected also and the communication is attained by a unified signal level.
摘要翻译：目的：通过提供自动增益控制电路来实现稳定的通信，以纠正信号在信号传输时的衰减。构成：发送麦克风2的声音信号fs经由衰减器3被施加到放大器4，并且其输出信号f0被施加到输出电路5.此外，信号f0被施加到二极管D1以获得控制电压对应于信号f0的Vd，控制衰减器3的电阻值，使得放大器4的输入信号fs和信号f0类似。因此，即使放大器4的信号fs较小，也不会降低信号f0的电平。然后，信号f0被发送到通信线路l1，并且当线路l1是长距离线路并且信号f0被衰减时，通过提供AGC电路1'来提升输出信号f0'。通过以这种方式提供AGC电路1,1'来均衡信号fs中的电平变化，还校正通信线路的衰减，并且通过统一的信号电平来实现通信。

3. 发明专利

JPS59208918A Current mirror circuit 失效
标题翻译：当前镜像电路
公开(公告)号：JPS59208918A
公开(公告)日：1984-11-27
申请号：JP8273683
申请日：1983-05-13
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： SATOU TETSUO , ICHIKAWA YOSHIHISA
IPC分类号： H03F3/343 , H03F3/34 , H03F3/347
摘要： PURPOSE: To flow a large current without increasing the emitter area by combining a vertical npn transistor TR to the output side of a current mirror circuit consisting of a lateral pnp TR.
CONSTITUTION: An output side circuit consists of a resistance R
2 , a lateral pnp TRQ
3 and a vertical npn TRQ
4 . When +Vcc power supply is applied, the VBE
2 of a TRQ
2 is applied between the collector and the base of a TRQ
1 . Thus the TRQ
1 is turned on, causing a current I
1 to flow. At the same time, a current I
0 flows by the logarithm characteristics of VBE
3 . The voltage V
1 shown in the diagram is decided by a resistance R
1 , the current I
1 and a collector saturated current IS. Then a current I
2 flows to the TRQ
4 when the current I
1 flows. The TRQ
4 is equal to an npn TR and therefore can have a vertical structure when it is converted into an IC. Therefore the voltage V
1 is decided, and the emitter area of the TRQ
4 can be increased despite a small level of the current I
0 . Thus it is possible for a large current I
2 to flow.
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过将垂直npn晶体管TR组合到由侧向pnp TR组成的电流镜电路的输出侧，来流过大电流而不增加发射极面积。构成：输出侧电路由电阻R2，侧向pnp TRQ3和垂直npn TRQ4组成。当施加+ Vcc电源时，TRQ2的VBE2被施加在TRQ1的集电极和基极之间。因此，TRQ1导通，导致电流I1流动。同时，电流I0流过VBE3的对数特性。图中所示的电压V1由电阻R1，电流I1和集电极饱和电流IS决定。那么当电流I1流动时，电流I2流向TRQ4。 TRQ4等于npn TR，因此在转换为IC时可以具有垂直结构。因此，决定电压V1，尽管电流I0的电平小，也可以增加TRQ4的发射极面积。因此，可以使大电流I2流动。

4. 发明专利

JPH11164317A VIDEO SIGNAL PROCESSING UNIT 失效
公开(公告)号：JPH11164317A
公开(公告)日：1999-06-18
申请号：JP32643897
申请日：1997-11-27
申请人： HITACHI LTD , HITACHI ULSI SYS CO LTD
发明人： MAYUZUMI SHIRO , YAMAZAKI KOICHI , HIRANO TOSHIAKI , KAMEGAKI KAZUYUKI , HOSHINO KATSUMI , NAKAGAWA TADASHI , ICHIKAWA YOSHIHISA , OKADA YOSHITAKA , MORI SHUNJI , TAKAYAMA ETSUTAKA , KITAMURA YUKINORI , KOBAYASHI YUJI , TAKEBUCHI KENJI , KURIHARA TAKASHI
IPC分类号： H04N9/793
摘要： PROBLEM TO BE SOLVED: To provide the technology that suppresses a crosstalk up to a practical level and attains one chip processing of a recording and reproducing preamplifier and a luminance signal and color signal processing circuit. SOLUTION: A recording and reproducing preamplifier 2 and a luminance signal and color signal processing circuit 3 are formed on one semiconductor chip. Then a mode changeover control circuit (logic circuit section having a changeover control circuit 4) consisting of an IIL (integrated injection logic) having been included in the circuits 2, 3 is placed between the recording and reproducing preamplifier 2 and the luminance signal and color signal processing circuit 3 to surround the IIL circuit around the recording and reproducing preamplifier 2.

5. 发明专利

JPH10243338A VIDEO RECORDING SYSTEM 失效
公开(公告)号：JPH10243338A
公开(公告)日：1998-09-11
申请号：JP4226897
申请日：1997-02-26
申请人： HITACHI LTD , HITACHI CHIYOU LSI SYS KK
发明人： TAKEBUCHI KENJI , KANESHIRO KATSUMI , KURIHARA TAKASHI , ICHIKAWA YOSHIHISA
IPC分类号： H04N5/91
摘要： PROBLEM TO BE SOLVED: To inhibit normal recording of a video signal processed by a copy prevention device and to secure normal recording of a video signal not processed by the copy prevention device excluding the malfunction of copy guard by detecting a peak level only in a specific period for superposing a copy guard signal to the video signal. SOLUTION: A peak value type AGC circuit 11 detects a peak level obtained immediately after temporarily allowing the instantaneous level of a video signal Vs2 of which period pulse top is DC clamped to a reference level VCL to fall to the reference level VCL and restricts the amplitude of the video signal Vs2 so that the peak level is less than the prescribed limit level V1 of the reference level VCL. A recording circuit 23 records the video signal of which amplitude is limited by the AGC circuit 11 in a recording medium. A timing control means allows the AGC circuit 11 to detect the peak level only to a specific period for superposing a copy guard signal to the video signal Vs2.

6. 发明专利

JPS60123111A AMPLIFIYING CIRCUIT 失效
公开(公告)号：JPS60123111A
公开(公告)日：1985-07-01
申请号：JP22992683
申请日：1983-12-07
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： ICHIKAWA YOSHIHISA , SATOU TETSUO
IPC分类号： H03F1/00
摘要： PURPOSE:To prevent the occurrence of pop tone at a power-off time by driving an amplifying circuit with a reference voltage whose level falls in accordance with level fall of a power source voltage at the power-off time and reducing the level of an output voltage quickly. CONSTITUTION:When a power switch S1 is turned on to supply a power source voltage +VCC, a base voltage VC is supplied to a transistor TRQ11 to turn on this TR, and a current I1 is flowed to a resistance R14, And a TRQ13 is turned on, and a voltage VA of capacitor C1 rises. When the switch S1 is turned off, the voltage VC falls by the time constant of a filter F1. Since the TRQ13 continues to be in the turn-on state, the electric charge of the capacitor C1 is discharged through a resistance R15, and the voltage VA falls. Then, an output voltage VQ of a differential amplifier to which the voltage VA is supplied as the reference voltage is reduced gradually.

7. 发明专利

JPH10257522A SIGNAL PROCESSING CIRCUIT FOR VTR 失效
公开(公告)号：JPH10257522A
公开(公告)日：1998-09-25
申请号：JP7262097
申请日：1997-03-10
申请人： HITACHI LTD , HITACHI CHIYOU LSI SYS KK , VICTOR COMPANY OF JAPAN
发明人： KURIHARA TAKASHI , ICHIKAWA YOSHIHISA , ARAI IZUMI , KURABAYASHI NAOKI , KURAMOTO HIROSHI , MUROTANI TAKESHI
IPC分类号： G11B5/027 , G11B20/02 , H03D7/16 , H04N9/79 , H04N9/793 , H04N9/83 , H04N9/84
摘要： PROBLEM TO BE SOLVED: To stably enable crosstalk removing operation even at the time of shifting into special reduction by providing a clock generating circuit for generating a clock signal synchronized with a horizontal synchronizing signal separated from a regenerative brightness signal. SOLUTION: In the case of NTSC system, a color under signal is delayed by a CCD 3 as a delay element for one horizontal period, supplied to a 2nd frequency converting circuit (main converter) 2 and turned into standard color signal. The clock signal to be used for the delay operation of CCD 3 is formed by a clock signal generating circuit 22. When signals outputted from 1st and 2nd frequency converting circuits 1 and 2 are in-phase, at an arithmetic circuit 4, a double crosstalk component is extracted by subtraction, that component is attenuated just for -6dB, namely, leveled down into 1/2, a crosstalk component is recovered and that component is attenuated from one covered output signal so that the crosstalk component contained in such a converted output signal can be removed.

8. 发明专利

JPS6282751A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS6282751A
公开(公告)日：1987-04-16
申请号：JP22183185
申请日：1985-10-07
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： ICHIKAWA YOSHIHISA , KURIHARA TERUMI , TAKESHITA RITSUJI
IPC分类号： H04M1/64 , H03F1/00 , H03G3/00 , H03G3/02
摘要： PURPOSE:To reduce noise and power consumption by providing an output circuit respectively to the final stage of plural signal transmission paths and providing a standby circuit controlling the current of each output circuit. CONSTITUTION:The output circuits 62-69 are provided respectively to the final stage of plural signal transmission paths and muting circuits 52-54 are provided respectively to each output circuit. Then a mute control signal is fed from an external connection terminal of an IC 1 synchronously with the changeover of switches S1-S4 provided to plural signal transmission paths in the muting circuit and each output is made inoperative tentatively at the changeover of the switches to reduce generation of pop noise attended with the changeover of switches. When the amplifier circuit 1 is inoperative, a minute idling current flows to each output circuit and a standby circuit 100 supplying a desired current at operation is provided to drive the amplifier circuit at a low power consumption.

9. 发明专利

JPS6282750A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS6282750A
公开(公告)日：1987-04-16
申请号：JP22183085
申请日：1985-10-07
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： ICHIKAWA YOSHIHISA , KURIHARA TERUMI , TAKESHITA RITSUJI
IPC分类号： H04M1/64 , H03F1/00 , H03G3/00 , H03G3/02
摘要： PURPOSE:To decrease a noise signal attended with the changeover of a switch provided to plural signal transmission paths by applying a muting control signal from an external connection terminal of a semiconductor integrated circuit so as to make each output circuit inoperative at the same time. CONSTITUTION:A mute signal Vm is fed to a terminal 18 from a CPU 3 nearly synchronously with the changeover of a switch circuit by the CPU 3. Then a mute control circuit 51 is driven at a time tw to give a mute signal Vm' to mute circuits 52-54, then the output circuits 62-64 are make inoperative temporarily at the same time. The time width is nearly equal to the time width tw of the mute control signal Vm and larger than the generated time width of a noise signal. Thus, even when the noise signal is generated in any signal path depending on the changeover of switches S1-S4, since the output circuit being the final stage is made inoperative temporarily, unpleasant pop noise to a listener is reduced or prevented.

10. 发明专利

JPS61269519A TWO-WAY SWITCH CIRCUIT 失效
公开(公告)号：JPS61269519A
公开(公告)日：1986-11-28
申请号：JP11046685
申请日：1985-05-24
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： ICHIKAWA YOSHIHISA , KURIHARA TERUMI , SATO TETSUO
IPC分类号： G11B5/027 , H03K17/76
摘要： PURPOSE:To decrease generation of distortion at signal transmission by providing a diode bridge composing of a bipolar transistor (TR) and a switch circuit so as to incorporate them with other electronic circuit for circuit integration. CONSTITUTION:Diode bridges 1, 2 composing of TRs Q1-Q4, Q1'-Q4' of diode connection are provided to the two-way switch circuit and a control circuit 3 controls the bridges 1, 2 at recording. A voice signal from a microphone MIC is fed to the bridge 1 via amplifiers 4, 5 while being converted into a current (i) and an output current i' from the bridge 1 is fed to a recording/ reproducing head 6. Further, the current (i) from the head 6 is fed to the bridge 2 at signal reproduction and the output current i' from the bridge 2 is fed to a speaker SP via amplifiers 11, 12. Then the bridges 1, 2 and the control circuit 3 are incorporated in the IC circuit together with other amplifiers 4, 5, 11, 12 to decrease generation of distortion at signal transmission.

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