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    • 4. 发明专利
    • NOISE ELIMINATION CIRCUIT
    • JPS6310907A
    • 1988-01-18
    • JP15531386
    • 1986-07-02
    • MATSUSHITA ELECTRIC IND CO LTD
    • KAKIMOTO TAKASHI
    • H03F1/26H04N5/21H04N5/93
    • PURPOSE:To eliminate residual noise and distortion of waveform by providing the 1st H.P.F whose cut-off frequency is variable and the 2nd H.P.F whose cut-off frequency is fixed so as to mix each output signal in opposite phase close to that of an original input signal. CONSTITUTION:An output of a H.P.F 18 is multiplied by a factor of B by an amplifier circuit 19 and the noise is also amplified by B. An output signal of a limiter circuit 13 and an output signal of the amplifier circuit 19 are inputted to a mixer 14 in opposite phase respectively and subtracted with each other. As a result, a signal (f) is obtained, a large signal level of the input video signal is eliminated completely and a small signal level such as noise is attenuated by a multiple of (1-B). Further, the noise extracting band of the output signal from the mixer 14 is limited toward higher frequencies by an L.P.F 15. In giving the signal to a mixer 16, where it is mixed with the original input video signal in opposite phase, a video signal (g) is obtained. Thus, the signal distortion having a comparatively large signal change is eliminated and a large noise rejection effect is obtained.
    • 6. 发明专利
    • Clamping device
    • 夹紧装置
    • JPS59114972A
    • 1984-07-03
    • JP22445582
    • 1982-12-21
    • Matsushita Electric Ind Co Ltd
    • YAMAMOTO YOSHIYUKIKAKIMOTO TAKASHI
    • H04N5/93H04N5/04H04N5/16H04N5/18
    • PURPOSE: To ensure high responsiveness even though the potential has a sudden change at the tip part of a synchronizing signal of a composite video signal, by actuating forcibly a clamp circuit if the difference between a peak wave detection output and a reference potential exceeds the fixed value.
      CONSTITUTION: A composite video signal is applied to a clamp circuit 2 from an input terminal 1. if this video signal to be applied to the terminal 1 floats up, the output of a synchronism separating circuit 4 drops out. As a result, the output of a peak wave detecting circuit 6 is less than the reference potential of a reference voltage source 8. Thus the output of a comparator 7 is supplied to the circuit 2, and the circuit 2 is actuated regardless of a composite synchronizing signal. Therefore the signal of an output terminal 3 tries to converge rapidly toward the potential at the tip part of a synchronizing signal. Thus the output of the circuit 6 is larger again than the reference potential, and a normal operation is reset.
      COPYRIGHT: (C)1984,JPO&Japio
    • 目的:即使潜在的复合视频信号的同步信号的尖端部分发生突然变化,为了确保高响应性,如果峰值波检测输出和参考电位之间的差异超过固定值,则强制执行钳位电路 值。 构成:复合视频信号从输入端子1施加到钳位电路2.如果要施加到端子1的视频信号浮起,则同步分离电路4的输出退出。 结果,峰值波检测电路6的输出小于参考电压源8的参考电位。因此,比较器7的输出被提供给电路2,电路2被启动而不管复合 同步信号 因此,输出端子3的信号试图迅速地向同步信号的尖端处的电位收敛。 因此,电路6的输出比参考电位再次大,并且正常操作被复位。
    • 7. 发明专利
    • Monostable multivibrator
    • 单机多功能一体机
    • JPS5939119A
    • 1984-03-03
    • JP14967982
    • 1982-08-27
    • Matsushita Electric Ind Co Ltd
    • KAKIMOTO TAKASHIIKEGAMI ICHIROUHAYASHI TAKAHARUOOURA KENKICHI
    • H03K3/02H03K3/023
    • H03K3/023
    • PURPOSE:To attain a monostable multivibrator with high speed, by connecting a diode in parallel between the base and emitter of an inverter transistor (TR) of a bistable multivibrator. CONSTITUTION:Diodes D6-D9 are connected respectively in parallel between the base and emitter of the inverter TRs Q1-Q4 of the bistable multivibrator and the D6 and the Q1, the D7 and the Q2, the D8 and the Q3 and the D9 and the D4 are formed respectively as the current mirror coupling. In impressing a trigger pulse to a terminal T3, the same current flows to the D9 and the Q4, a potential at a point (b) is nearly at a ground potential, a TRQ7 is turned off, a capacitor Ct is charged with a resistor Rt, the current to the Q2, the Q7 is zero and the potential at a point (a) goes to a high level. When the potential at the Ct reaches a comparison voltage VREF of a voltage comparison circuit comprising TRs Q8, Q9, a current of a TRQ10 flows to the D5, the TRQ11 turns on, a current flows to the D6 and the Q1, the potential at the point (a) reaches nearly the ground potential, the current to the Q3 and the D7 is zero, and the potential at the point (b) is increased rapidly to turn on the TRs Q12, Q7 so as to discharge rapidly the charge of the Ct. Since the Q1-Q4 are unsaturated because of the D6-D9, high speed is attained.
    • 目的:通过在双稳态多谐振荡器的逆变器晶体管(TR)的基极和发射极之间并联二极管,以获得高速单稳态多谐振荡器。 构成:二极管D6-D9分别并联在双稳态多谐振荡器的反相器TRs Q1-Q4的基极和发射极之间,D6和Q1,D7和Q2,D8和Q3以及D9和 D4分别形成为电流镜耦合。 在向端子T3施加触发脉冲时,相同的电流流向D9和Q4,点(b)处的电位几乎处于接地电位,TRQ7截止,电容器Ct被电阻 Rt,电流到Q2,Q7为零,点(a)的电位变为高电平。 当Ct的电位达到包括TRs Q8,Q9的电压比较电路的比较电压VREF时,TRQ10的电流流向D5,TRQ11导通,电流流向D6和Q1,电位 点(a)达到接近电位,到Q3和D7的电流为零,并且点(b)的电位迅速增加,使TRs Q12,Q7导通,以便迅速放电 Ct。 由于D6-D9由于Q1-Q4是不饱和的,因此达到高速。