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1.发明授权Controlled output composite keying signal generator for a television receiver 失效用于电视接收机的受控输出复合键控信号发生器
公开(公告)号：US4263610A
公开(公告)日：1981-04-21
申请号：US113371
申请日：1980-01-18
CPC分类号： H04N9/44
摘要： A circuit for generating a composite keying signal comprises a burst gate circuit and a voltage translating network in a color television receiver also including keyed signal processing circuits and means for deriving horizontal and vertical blanking signals and a horizontal sync signal from a composite color television signal containing a color burst component. The burst gate circuit responds to the horizontal sync signal to develop a burst gate pulse encompassing the burst interval. A voltage level developed by the translating network in response to the horizontal and vertical blanking signals is combined with the burst gate pulse to produce a composite keying signal. The composite keying signal comprises a first pulse component of a desired level as determined by the translating network and ocurring during the blanking intervals, and a second pulse cmponent as provided from the burst gate circuit, superimposed on the first pulse and encompassing the burst interval. Means are also included for inhibiting the output of the keying signal generator during picture intervals of the television signal, to prevent false keying of the keyed circuits in response to keying signals generated by the keying signal generator in the presence of spurious input signals occurring during picture intervals.
摘要翻译： 用于产生复合键控信号的电路包括彩色电视接收机中的脉冲串门电路和电压转换网络，其中还包括键控信号处理电路和用于从复合彩色电视信号中导出水平和垂直消隐信号和水平同步信号的装置， 颜色突发组件。 突发门电路响应于水平同步信号以产生包含突发间隔的脉冲串门脉冲。 由平移网络响应于水平和垂直消隐信号而产生的电压电平与脉冲串门脉冲组合以产生复合键控信号。 复合键控信号包括由翻译网络确定的期望电平的第一脉冲分量，以及在消隐间隔期间发出的第一脉冲分量，以及从突发门电路提供的第二脉冲组件，叠加在第一脉冲上并且包围脉冲间隔。 还包括用于在电视信号的图像间隔期间禁止键控信号发生器的输出的装置，以防止在存在在图像期间发生的寄生输入信号时由键控信号发生器产生的键控信号的键控电路的错误键控 间隔
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2.发明授权Predictable automatic brightness control circuit in a video signal image reproducing system 失效视频信号图像再现系统中可预测的自动亮度控制电路
公开(公告)号：US4203131A
公开(公告)日：1980-05-13
申请号：US8050
申请日：1979-01-31
CPC分类号： H04N17/04
摘要： Brightness control apparatus for a video signal image reproducing system including a video signal processing channel, a kinescope driver for supplying video signals to an image reproducing kinescope, and a source of substantially fixed potential to which signals processed by the kinescope driver are referenced. A comparator senses the substantially fixed reference potential and a blanking level which occurs during periodic blanking intervals of the video signal, and provides an output control signal indicative of the voltage difference between the reference potential and the blanking level. The control voltage is applied to the video channel for translating the blanking level in a direction to minimize the voltage difference, to thereby establish the conduction of the kinescope driver during image intervals of the video signal at a level corresponding to a desired image black level condition when such condition is manifested by the video signal.
摘要翻译： 参考了包括视频信号处理通道的视频信号图像再现系统的亮度控制装置，用于向图像再现显像管提供视频信号的显像管驱动器以及由显像管驱动器处理的信号的基本上固定的电位源。 比较器感测基本固定的参考电位和在视频信号的周期性消隐间隔期间发生的消隐电平，并且提供指示参考电位和消隐电平之间的电压差的输出控制信号。 控制电压被施加到视频通道，用于沿着使电压差最小化的方向平移消隐电平，从而在对应于期望的图像黑电平条件的电平的视频信号的图像间隔期间建立显像管驱动器的导通 当这种情况由视频信号表现时。
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3.发明授权
公开(公告)号：US4253110A
公开(公告)日：1981-02-24
申请号：US103445
申请日：1979-12-14
CPC分类号： H04N5/59
摘要： An automatic kinescope beam current limiter for a television receiver comprises a source of signal representative of kinescope beam current conduction, a first transistor responsive to the representative signal over first, second and third ranges of excessive beam currents above a threshold level, and a second transistor. A first control signal derived from the first transistor modifies the video signal peak-to-peak amplitude (contrast level) when beam currents above the threshold level occur. The output of the first transistor is selectively coupled to an input of the second transistor when beam currents beyond the first range occur. A second control signal derived from the second transistor modifies the video signal D.C. component (brightness level) to limit beam currents beyond the first range, whereby both the peak amplitude and D.C. components are modified over the second range. The first control signal is clamped to a fixed level in response to beam currents beyond the second range, whereby the video signal D.C. component is modified alone to limit beam currents over the third range.
摘要翻译： 一种用于电视接收机的自动显像管光束电流限制器包括代表显像管束电流传导的信号源，第一晶体管响应于超过阈值电平的超过束电流的第一，第二和第三范围的代表信号，以及第二晶体管 。 当出现高于阈值电平的光束电流时，从第一晶体管导出的第一控制信号修改视频信号峰 - 峰幅度（对比度）。 当超过第一范围的束电流发生时，第一晶体管的输出选择性地耦合到第二晶体管的输入。 从第二晶体管导出的第二控制信号修改视频信号D.C.分量（亮度电平）以限制超出第一范围的波束电流，从而在第二范围上修改峰值振幅和直流分量。 响应于超过第二范围的束电流，第一控制信号被钳位到固定电平，从而单独修改视频信号D.C.分量以限制在第三范围上的电流。
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公开(公告)号：US4441121A
公开(公告)日：1984-04-03
申请号：US460985
申请日：1983-01-25
摘要： Signals to be cored are applied to the inputs of a linear signal amplifier, and of a multistage limiting amplifier having cascaded input and output amplifying stages. A cored version of the signals, corresponding to the difference between a linearly translated version of the signals and a doubly clipped version thereof, is developed by a signal combiner responsive to the outputs of both amplifiers. A variable coring level control voltage controls the distribution of gain between the input and output amplifying stages, substantially without disturbing the overall gain of the limiting amplifier, which is set to match the overall gain of the linear amplifier. In an illustrative embodiment, the signals which are adjustably cored are horizontal peaking signals derived from the received luminance signal in a color television receiver. An automatic peaking control system associated with output of the adjustable coring circuit opposes changes in peaking level that might otherwise accompany coring level adjustment.
摘要翻译： 作为核心的信号被应用于线性信号放大器和具有级联输入和输出放大级的多级限幅放大器的输入。 对应于信号的线性翻译版本与其双限幅版本之间的差异的信号的核心版本由响应于两个放大器的输出的信号组合器开发。 可变的取芯电平控制电压控制输入和输出放大级之间的增益分布，基本上不干扰限制放大器的总体增益，其被设置为与线性放大器的总增益相匹配。 在说明性实施例中，可调节地包围的信号是在彩色电视接收机中从接收到的亮度信号导出的水平峰值信号。 与可调节取芯电路的输出相关联的自动峰化控制系统反对峰值水平的变化，否则可能伴随取芯水平调整。
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5.发明授权Video signal peaking control system with provision for automatic and manual control 失效视频信号峰值控制系统，提供自动和手动控制
公开(公告)号：US4399460A
公开(公告)日：1983-08-16
申请号：US310139
申请日：1981-10-09
IPC分类号： A61K31/20 , A61K31/203 , A61K31/505 , A61P27/02 , A61P27/12 , H04N5/205 , H04N5/208 , H04N5/14 , H03K1/00 , H04N5/52
CPC分类号： H04N5/205
摘要： A DC coupled system for automatically controlling the high frequency peaking content of a video signal is disclosed. The system includes a DC coupled control path comprising a peak detector for developing a control voltage representative of the high frequency content of the video signal exclusive of video signal DC components, and is preceded by a video signal amplifier. A filter for shaping the frequency response of the control path is connected to the amplifier. A manually adjustable peaking control for controlling the DC bias of the amplifier is also connected to the amplifier. The filter and adjustable peaking control exhibit mutually independent operation, and are both connected to the amplifier via the same single terminal.
摘要翻译： 公开了一种用于自动控制视频信号的高频峰值内容的DC耦合系统。 该系统包括直流耦合控制路径，其包括峰值检测器，用于开发代表视频信号DC分量的视频信号的高频内容的控制电压，并且在视频信号放大器之前。 用于整形控制路径的频率响应的滤波器连接到放大器。 用于控制放大器的DC偏置的手动调节峰值控制也连接到放大器。 滤波器和可调峰值控制显示相互独立的操作，并且都通过相同的单个端子连接到放大器。
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公开(公告)号：US4555722A
公开(公告)日：1985-11-26
申请号：US561331
申请日：1983-12-14
CPC分类号： H04N9/44
摘要： Trilevel sandcastle pulse decoder includes a trio of voltage comparators for comparing incoming sandcastle pulses with reference potentials of respectively different levels. One of the voltage comparators, which is subject to change in operating state in response to appearance of a given level of the sandcastle pulse, is precluded from operating state change in response to the appearance of the next higher level of the sandcastle pulse by control circuitry responsive to the output of a second of the voltage comparators. One of the decoder outputs is developed by logic circuitry responsive to outputs of two of the comparators.
摘要翻译： Trilevel沙堡脉冲解码器包括三个电压比较器，用于将进入的沙堡脉冲与不同电平的参考电位进行比较。 响应于给定水平的沙堡脉冲的出现而经受操作状态变化的电压比较器中的一个被控制电路响应于下一个更高水平的沙堡脉冲的出现被排除在操作状态变化之外 响应于第二电压比较器的输出。 解码器输出之一由逻辑电路开发，响应于两个比较器的输出。
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公开(公告)号：US4426625A
公开(公告)日：1984-01-17
申请号：US296865
申请日：1981-08-27
CPC分类号： H03G3/10 , H03G1/0023 , H03G3/00
摘要： A circuit for linearly controlling the gain of a differential amplifier includes a differentially connected current splitter network biased by means of a symmetrical bias circuit coupled to a common operating potential and including first and second current sources with associated first and second impedances. The current splitter includes a diode exhibiting a non-linear voltage in response to linear current conduction, and a transistor. The bias circuit responds to a variable gain control voltage for causing the diode to conduct current which varies linearly with the gain control voltage. First and second mutually differential control voltages derived from the transistor and diode, including a non-linearly varying voltage exhibited by the diode, are applied to the differential amplifier for controlling the conduction of the differential amplifier linearly with respect to the original control voltage.
摘要翻译： 用于线性控制差分放大器的增益的电路包括通过耦合到公共工作电位的对称偏置电路偏置的差分连接的分流器网络，并且包括具有相关联的第一和第二阻抗的第一和第二电流源。 电流分路器包括响应于线性电流传导而呈现非线性电压的二极管和晶体管。 偏置电路响应于可变增益控制电压，以使二极管导通电流，其随着增益控制电压线性变化。 将由二极管显示的包括非线性变化电压的晶体管和二极管导出的第一和第二相互差分控制电压施加到差分放大器，用于相对于原始控制电压线性地控制差分放大器的导通。
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公开(公告)号：US4272778A
公开(公告)日：1981-06-09
申请号：US126783
申请日：1980-03-03
CPC分类号： H04N9/66
摘要： A first resistive current path is DC connected between respective output terminals of push-pull color demodulator. A second resistive current path is DC connected between respective output terminals of a second push-pull color demodulator. An output color-difference signal is formed by a differential amplifier having one input DC connected to an asymmetrically positioned point in first resistive current path, and a second input DC connected to an asymmetrically positioned point in second resistive current path. Output color-difference signal corresponds to a combination of the demodulated signals, with a polarity relationship and magnitude ratio determined by the asymmetry of positioning of the takeoff points in the respective current paths. Output quiescent voltage is independent of the asymmetry of positioning of the takeoff points.
摘要翻译： 第一电阻电流路径是直流连接在推挽色彩解调器的相应输出端之间。 第二电阻电流路径是DC连接在第二推挽彩色解调器的相应输出端之间。 输出色差信号由具有连接到第一电阻电流路径中的非对称定位点的一个输入DC的差分放大器和连接到第二电阻电流路径中的非对称定位点的第二输入DC形成。 输出色差信号对应于解调信号的组合，具有由相应电流路径中的取样点的定位的不对称性确定的极性关系和幅度比。 输出静态电压独立于起飞点定位的不对称性。
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9.发明授权PLL Oscillator synchronizing system with DC control of free-running frequency 失效PLL振荡器同步系统，具有自由运行频率的直流控制
公开(公告)号：US4485354A
公开(公告)日：1984-11-27
申请号：US383303
申请日：1982-05-28
摘要： Color reference oscillator comprises a non-inverting amplifier, with positive feedback via a crystal filter linking its output and input. A quadrature phase shift network, coupled to the filter output, delivers phase shifted signals to a pair of independently controlled amplifiers. One of the controlled amplifiers is responsive to control voltage outputs of a burst-responsive phase detector so as to inject phase shifted signals into the oscillator loop, as and when required, to effect synchronization of oscillator with burst component of incoming color television signal. The second of the controlled amplifiers is responsive to a reference DC voltage and to a manually adjustable DC control voltage, and develops a phase shifted signal output, of a magnitude and polarity dependent upon the magnitude and sense of the difference, if any, between the respective DC voltages, for combination with the non-inverting amplifier's output. Variation of the manually adjustable control voltage effects an adjustment of the free-running frequency of the oscillator.
摘要翻译： 颜色参考振荡器包括非反相放大器，通过连接其输出和输入的晶体滤波器具有正反馈。 耦合到滤波器输出的正交相移网络将相移信号传送到一对独立控制的放大器。 受控放大器中的一个响应于脉冲串响应相位检测器的控制电压输出，以便在需要时将相移信号注入到振荡器环路中，以实现振荡器与输入彩色电视信号的突发分量的同步。 受控放大器中的第二个响应参考直流电压和手动可调节的直流控制电压，并产生一个幅度和极性的相移信号输出，取决于两者之间的差异（如果有的话）的大小和感觉 各直流电压，用于与非反相放大器的输出相结合。 手动可调控制电压的变化会影响振荡器自由运行频率的调整。
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公开(公告)号：US4404593A
公开(公告)日：1983-09-13
申请号：US296863
申请日：1981-08-27
CPC分类号： H04N9/645
摘要： An image brightness control circuit is included in a television receiver which also includes a video signal black level clamp comprising a charge storage capacitor. The clamp operates during video signal blanking intervals, between picture intervals, for establishing a video signal black reference level. A variable brightness control voltage is applied to the clamp-controlled video signal only during picture intervals of the video signal. Brightness control is thereby achieved without introducing a visible gradual change in the brightness of a reproduced image, which would otherwise be produced by the action of the clamp charging or discharging the storage capacitor.
摘要翻译： 图像亮度控制电路包括在电视接收机中，该电视接收机还包括包括电荷存储电容器的视频信号黑电平钳位电路。 在图像间隔期间的视频信号消隐间隔期间钳位操作，用于建立视频信号黑色参考电平。 仅在视频信号的图像间隔期间将可变亮度控制电压施加到钳位控制的视频信号。 由此可以实现亮度控制，而不会引起再现图像的亮度的可见的逐渐变化，否则可能由夹持器对存储电容器充电或放电的作用产生。
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