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公开(公告)号：US4387390A
公开(公告)日：1983-06-07
申请号：US205820
申请日：1980-11-10
摘要： An automatic beam current limiting circuit for a color television receiver comprises means for individually monitoring the three cathode currents developed in response to the green, blue and red video drive signals. The video processing unit of the receiver is automatically adjusted in response to any one of the cathode currents exceeding a predetermined level for reducing the video drive signals to limit the excessive cathode current to the predetermined level. As a result, the individual cathode currents are limited to the predetermined level while the combined cathode currents are allowed to substantially exceed this level.
摘要翻译： 用于彩色电视接收机的自动光束电流限制电路包括用于单独监视响应于绿色，蓝色和红色视频驱动信号而产生的三个阴极电流的装置。 响应于任何一个阴极电流超过预定电平，接收器的视频处理单元被自动调整，以减少视频驱动信号，以将过量的阴极电流限制到预定的电平。 结果，单个阴极电流被限制到预定电平，同时允许组合的阴极电流基本上超过该电平。
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公开(公告)号：US4513320A
公开(公告)日：1985-04-23
申请号：US472785
申请日：1983-03-07
CPC分类号： H04N5/57 , H03F3/45071 , H03F3/68 , H04N5/208
摘要： A luminance peaking circuit includes a common and differential mode amplifier comprising a first differentially coupled pair of transistors coupled to a current source and functioning in a differential mode and a second differentially coupled pair of transistors functioning in a common mode. The bases of the second pair of transistors are connected together and to the base of one of the first pair of transistors. The inputs to the amplifier comprise a common mode signal and a differential mode signal and the outputs are matrixed to produce common mode signal components with opposite polarity differential mode components. The amplifier is characterized by a differential mode gain that is independent of common mode signal level and a common mode gain that is independent of differential signal level.
摘要翻译： 亮度峰化电路包括公共和差模放大器，其包括耦合到电流源并以差分模式工作的第一差分耦合的晶体管和在共模中工作的第二差分耦合的晶体管对。 第二对晶体管的基极连接在一起并连接到第一对晶体管之一的基极。 放大器的输入包括一个共模信号和一个差分模式信号，并且输出被矩阵化以产生具有相反极性差分模式分量的共模信号分量。 放大器的特征在于独立于共模信号电平的差分模式增益和独立于差分信号电平的共模增益。
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公开(公告)号：US4323917A
公开(公告)日：1982-04-06
申请号：US197861
申请日：1980-10-17
CPC分类号： H04N9/643
摘要： A tint control circuit is described for use in a color television receiver. The circuit generates four currents having substantially equal D.C. components, and having respective 3.58 MH.sub.z subcarrier components of four different quadrature phases. The phase of each such current is preferably variable over a range of .+-.45 degrees. In a preferred embodiment, the four currents are coupled to a matrixing network for developing a pair of subcarrier output voltages whose phases differ by more than 90 degrees and whose D.C. components are substantially equal. As the phases of the four currents are varied, the phases of the subcarrier output voltages vary accordingly, but maintain their phase relationship to each other.
摘要翻译： 描述了用于彩色电视接收机中的色调控制电路。 电路产生具有基本上相等的直流分量的四个电流，并且具有四个不同正交相位的各自的3.58MHz子载波分量。 每个这样的电流的相位优选在+/- 45度的范围内是可变的。 在优选实施例中，四个电流耦合到矩阵网络，用于开发相位相差超过90度并且其直流分量基本上相等的副载波输出电压。 随着四个电流的相位发生变化，副载波输出电压的相位相应变化，但是保持彼此的相位关系。
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公开(公告)号：US4766483A
公开(公告)日：1988-08-23
申请号：US57414
申请日：1987-06-02
摘要： An automatic color tuning system includes a counter controlled oscillator that is started in the middle of its controllable frequency range. If the counter counts around and no color burst signal is detected, the oscillator is stopped. Whenever the oscillator is sweeping, an automatic phase control circuit is operated at low gain for assuring that the oscillator will be close to the frequency of the color burst signal when lock-up occurs. Whenever the oscillator is stopped, the automatic phase control circuit gain is made high. Once the automatic phase control circuit locks up the oscillator to a color burst signal, a subsequent loss of the color signal does not re-initiate the counter.
摘要翻译： 一种自动色彩调节系统，包括在其可控频率范围中间启动的反控制振荡器。 如果计数器计数，并且没有检测到色同步信号，则振荡器停止。 每当振荡器扫描时，自动相位控制电路以低增益工作，以确保当锁定发生时振荡器将接近色同步信号的频率。 每当振荡器停止时，自动相位控制电路的增益都变高。 一旦自动相位控制电路将振荡器锁定为色同步信号，则颜色信号的随后丢失不会重新启动计数器。
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公开(公告)号：US4323923A
公开(公告)日：1982-04-06
申请号：US194170
申请日：1980-10-06
申请人： Daniel L. Reneau
发明人： Daniel L. Reneau
IPC分类号： H04N5/16
CPC分类号： H04N5/16
摘要： Disclosed is a DC-coupled video amplifier with AGC feedback having a stable operating point. Shifting of sync tip DC level resulting in a loss of synchronization of the video signal is compensated for by means of a feedback loop in the video amplifier thus providing a level video output signal.
摘要翻译： 公开了具有AGC反馈的DC耦合视频放大器，其具有稳定的工作点。 通过视频放大器中的反馈回路补偿导致视频信号的同步丢失的同步尖端直流电平的移位，从而提供电平视频输出信号。
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公开(公告)号：US4298884A
公开(公告)日：1981-11-03
申请号：US135947
申请日：1980-03-31
申请人： Daniel L. Reneau
发明人： Daniel L. Reneau
CPC分类号： H04N9/71
摘要： A chroma amplifier and color killer are described for use in a color television receiver. In a preferred embodiment, the chroma amplifier comprises a first pair of emitter-coupled transistors receiving a current source which has a D.C. operating component and an A.C. chroma signal component. A second pair of emitter-coupled transistors receives another current source which has only a D.C. operating component substantially equal to that received by the first pair of transistors. A variable ACC voltage and a substantially fixed bias voltage are applied to selected base terminals of the transistors such that one of the first pairs of transistors develops a gain controlled A.C. chroma signal output and one of the second pair of transistors develops an ACC-varied D.C. output signal free of chroma component. The latter signal drives a low power color killer for quenching color reproduction when the color component of the broadcast signal is missing or is of very low amplitude.
摘要翻译： 彩色放大器和彩色抑制器被描述用于彩色电视接收机。 在优选实施例中，色度放大器包括接收电流源的第一对发射极耦合晶体管，其具有直流工作分量和交流电场色度信号分量。 第二对发射极耦合晶体管接收另一个电流源，其仅具有基本上等于由第一对晶体管接收的直流工作分量的直流工作分量。 可变ACC电压和基本上固定的偏置电压施加到晶体管的选定基极，使得第一对晶体管中的一个晶体管产生增益受控AC色度信号输出，第二对晶体管之一产生ACC变化的DC 输出信号没有色度分量。 当广播信号的颜色分量丢失或幅度非常小时，后一种信号驱动低功率彩色抑制器来淬灭色彩再现。
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公开(公告)号：US4293874A
公开(公告)日：1981-10-06
申请号：US118127
申请日：1980-02-04
申请人： Daniel L. Reneau
发明人： Daniel L. Reneau
IPC分类号： H04N5/18
CPC分类号： H04N5/185
摘要： A DC restoration circuit for an AC coupled television receiver includes means for converting an input video voltage signal to a corresponding video current signal and for abstracting from the video current signal a DC current feedback signal, the remaining video current signal being reconverted to a corresponding output video voltage having a DC voltage component. A feedback loop including a clamp capacitor is operable during the back porch of the horizontal blanking interval for establishing the level of the DC current feedback signal to equalize the values of the DC component of the output video voltage and a black level reference voltage derived from a manually operable brightness control.
摘要翻译： 用于AC耦合电视接收机的DC恢复电路包括用于将输入视频电压信号转换为相应的视频电流信号的装置，并且从视频电流信号中提取DC电流反馈信号，剩余的视频电流信号被重新转换为对应的输出 视频电压具有直流电压分量。 包括钳位电容器的反馈回路在水平消隐间隔的后沿期间可操作，以建立直流电流反馈信号的电平以均衡输出视频电压的直流分量的值和从 手动可操作的亮度控制。
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公开(公告)号：US4535256A
公开(公告)日：1985-08-13
申请号：US488889
申请日：1983-04-26
申请人： Daniel L. Reneau
发明人： Daniel L. Reneau
摘要： A PNP turnaround circuit includes a common base lateral PNP transistor connected to the output of a high gain amplifier having a resistor coupled thereacross. The input is supplied from a differential pair of NPN transistors havng their emitters connected to a current source. One transistor of the differential pair has its collector connected to the collector of the PNP for supplying a push/pull output. In another embodiment the collector of the PNP is returned to ground through a load resistor and a DC level shifted output signal is developed.
摘要翻译： PNP周转电路包括连接到具有耦合到其上的电阻器的高增益放大器的输出的公共基极横向PNP晶体管。 该输入由NPN晶体管的差分对提供，连接到电流源的发射极。 差分对的一个晶体管的集电极连接到PNP的集电极，用于提供推/拉输出。 在另一个实施例中，PNP的集电极通过负载电阻器返回到地，并且开发了DC电平移位的输出信号。
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