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1. 发明专利

JPS56128084A COLOR SIGNAL GAIN CONTROL CIRCUIT 失效
公开(公告)号：JPS56128084A
公开(公告)日：1981-10-07
申请号：JP3037580
申请日：1980-03-12
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： TONOMURA KENICHI , TAKAHASHI KIYOUICHI , FURUHATA MAKOTO
IPC分类号： H04N9/68
摘要： PURPOSE:To prevent the failure due to a variation of the ratio of a color burst signal to a chrominance signal, by selecting an input to the ACC detection circuit for forming a gain control signal of the first band amplifier circuit, by means of an output of the second band amplifier circuit connected to the output of said amplifier circuit, and an output which has been obtained by providing said output to the burst gate circuit. CONSTITUTION:A color burst signal and a chroma signal VIN, which have been applied to the first band amplifier circuit 1 having a variable gain function are amplified, and after that they become an output signal Vout through the second band amplifier circuit 2. The output of this second band amplifier circuit 2 is inputted to the burst gate circuit 3, and only a color burst signal B is drawn out. The input of the ACC circuit 4 for controlling the gain of the first band amplifier circuit 1 optionally selects an output of the second band amplifier circuit 2 or the burst gate circuit 3.

2. 发明专利

JPS56128083A PHASE DETECTION CIRCUIT 失效
公开(公告)号：JPS56128083A
公开(公告)日：1981-10-07
申请号：JP3037480
申请日：1980-03-12
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： TONOMURA KENICHI , TAKAHASHI KIYOUICHI
IPC分类号： H04N9/45 , H04N9/64
摘要： PURPOSE:To limit a control range of phase control by limiting the other phase detection operation by means of a level of one phase detection output, in the circuit for phase-detecting an input signal by the respective reference frequency signals having different phase each other. CONSTITUTION:A detection output V1 of the first phase detection circuit 1, to which an input signal VIN and the first reference signal Vref1 are inputted, is inputted to the level deciding circuit 3. On the other hand, the second phase detection circuit 2 is provided for inputting the input signal VIN, and the second reference signal Vref2 whose phase is different from that of the first reference signal. And, the threshold voltage of the level deciding circuit 3 is made Vr, and when the detection output V1 has exceeded the voltage Vr, operation of the second detection circuit 2 is inhibited by its decision output.

3. 发明专利

JPS60120687A TELEVISION RECEIVER 失效
公开(公告)号：JPS60120687A
公开(公告)日：1985-06-28
申请号：JP22845683
申请日：1983-12-05
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： TAKAHASHI KIYOUICHI , KADOKAWA SHIGERU
IPC分类号： H04N9/71
摘要： PURPOSE:To enable to prevent the fluctuation of the color saturation degree when the monochrome broadcast reception is switched to the color broadcast reception by holding the control voltage of a color control circuit to the required voltage level at the time of the monochrome broadcast reception. CONSTITUTION:A color television signal V0 from an image amplifier circuit 6 is added to an image signal amplifier system 9 and also to a chrominance signal processing system 20, and the chrominance signal whose Y signal is removed is added to an initial-stage band amplifier 22. a chroma signal from a burst gate 24 is supplied to a color control circuit 25 which adjusts the color saturation degree, and in addition, the signal is supplied to R-Y and B-Y demodulation circuits 30 and 31. Here, the output of a killer detection circuit 26 becomes the high level at the time of the monochrome broad reception, the output is added to a flush-over prevention circuit 41, and a transistor Q7 becomes the On condition. Then, the voltage level of a terminal T1 is lowered to the constant voltage forcedly. Thus, the occurrence of the flush-over phenomenon is prevented.

4. 发明专利

JPS55140330A CURRENT DIVISION UNIT 失效
公开(公告)号：JPS55140330A
公开(公告)日：1980-11-01
申请号：JP4795279
申请日：1979-04-20
申请人： HITACHI LTD
发明人： FURUHATA MAKOTO , TAKAHASHI KIYOUICHI
IPC分类号： H03K19/091
摘要： PURPOSE:To obtain a simplified current dividing circuit by providing plural emitters and collectors, where effective emitter and collector areas are set in respective division ratios, and a base biased commonly. CONSTITUTION:The effective emitter area ratio of P-type semiconductor regions 1a and 1b which constitute the injector of an I L circuit is set to, for example, 1:2, and effective collector areas of P-type semiconductor regions 2a1-2a3 and 2b1-2b4 which constitute collectors corresponding to them are divided into three and four equally respectively. N type semiconductor region 3 constitutes a practical base region and is biased to the earth potential. If emitter regions 1a and 1b are made common and constant current I0 is flowed, the current input from injector 1a to collectors 2a1-2a3 becomes I0/3X1/3=10/9. Meanwhile, the current input from injector 1b to collectors 2b1-2b4 becomes 2I0/3X1/4=I0/6. Consequently, different constant current loads can be obtained from one constant current source by a simplified circuit.

5. 发明专利

JPS59191908A Amplifier circuit 失效
标题翻译：放大器电路
公开(公告)号：JPS59191908A
公开(公告)日：1984-10-31
申请号：JP6533383
申请日：1983-04-15
申请人： Hitachi Ltd , Hitachi Micro Comput Eng Ltd
发明人： UEDA SEIICHI , MAMETA JIYUNICHI , KADOKAWA SHIGERU , TAKAHASHI KIYOUICHI
IPC分类号： H03F1/00 , H03F3/343
CPC分类号： H03F3/343
摘要： PURPOSE:To attain a high-speed response to a level change of an input signal by supplying a current forcibly to an output terminal in response to the rise of the input signal and at the same time sucking the current forcibly in response to the fall of the input signal. CONSTITUTION:When an input signal Vin is supplied to an input terminal T1, transistors (TR) Q7, Q1 and Q12 are turned on. Then a current route is formed from a +VCC power supply to a resistance R12, a diode D2 and TRs Q5, Q11 and Q12 respectively to flow a large current. As a result, a base current is supplied to a TRQ13 from the +VCC power supply via a resistance R11 and a TRQ3. Then a TRQ13 is turned on, and a current is flowed to an output terminal T2 from the +VCC power supply. When the voltage level of the signal Vin drops, a diode D11 is turned on to form a current route to the terminal T2, the diode D11 and the collector of a TRQ14 respectively. Thus the voltage level of an output signal Vout is dropped forcibly.
摘要翻译：目的：通过响应于输入信号的上升而强制地向输出端子提供电流来实现对输入信号的电平变化的高速响应，并且同时响应于下降而强制吸入电流输入信号。构成：当输入信号Vin被提供给输入端子T1时，晶体管（TR）Q7，Q1和Q12导通。然后，分别从+ VCC电源到电阻R12，二极管D2和TRs Q5，Q11和Q12形成电流路径，以流过大电流。结果，基极电流通过电阻R11和TRQ3从+ VCC电源提供给TRQ13。然后，TRQ13导通，电流从+ VCC电源流向输出端子T2。当信号Vin的电压下降时，二极管D11导通，分别形成到端子T2，二极管D11和TRQ14的集电极的电流路径。因此，输出信号Vout的电压电平被强制地下降。

6. 发明专利

JPS60217785A TELEVISION RECEIVER 失效
公开(公告)号：JPS60217785A
公开(公告)日：1985-10-31
申请号：JP7284484
申请日：1984-04-13
申请人： HITACHI MICROCUMPUTER ENG , HITACHI LTD
发明人： TAKAHASHI KIYOUICHI
IPC分类号： H04N9/68
摘要： PURPOSE:To obtain a television receiver which can prevent surely color saturation phenomena, by controlling the gain of a band amplifier, of the first stage in accordance with amplitudes of a color burst signal and a cross signal. CONSTITUTION:A signal Y is removed from a color television signal VV by a Y signal filter circuit 21, and the cross signal and the color burst signal are applied to a band amplifier 22 of the first stage. The cross signal C and the color burst signal B are amplified by the second band amplifier 23 and are supplied to a burst gate circuit 24 of the next stage. The burst gate circuit 24 separates the burst signal B and the cross signal C from each other and supplies the burst signal B and the cross signal C to a burst amplifier 25 and a color control circuit 26 respectively. The gain of the band amplifier 22 of the first stage is controlled by the amplitude level of the color burst signal B, which is detected by an ACC detector 27, and a control voltage VA from an adder 32 which is generated on a basis of the cross signal C.

7. 发明专利

JPS58142689A HUE ADJUSTING CIRCUIT 失效
公开(公告)号：JPS58142689A
公开(公告)日：1983-08-24
申请号：JP2444082
申请日：1982-02-19
申请人： HITACHI LTD , HITACHI MICROCUMPUTER ENG
发明人： TAKAHASHI KIYOUICHI , TONOMURA KENICHI
IPC分类号： H04N9/45 , H04N9/64
摘要： PURPOSE:To enable free selection of the range of hue adjustment by adding two signals that synchronize with color subcarrier to the first and the second differential amplifier circuit, and making gains of the two amplifier circuits different. CONSTITUTION:The first frequency signal V1 that synchronizes with color subcarrier formed in a color subcarrier generating circuit 8 and the second frequency signal V2 formed by phase shifting the signal by 90 deg. are formed by the first differential amplifier circuits Q5, Q6. A pair of output signals of the amplifier circuits Q5, Q6 are combined by a balancing differential circuits Q1-Q4 according to a hue controlling signal T. Common loading device R6 is provided for an output signal of the second differential amplifier circuits Q7, Q8 that receives the first frequency signal V1 and one of output signal of the first differential amplifier circuit that passed corresponding balancing differential circuit. Gains of the first differential amplifier circuits Q5, Q6 and of the second differential amplifier circuits Q7, Q8 are made different.

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