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1.发明授权Amplifier incorporating gain distribution control for cascaded amplifying stages 失效用于级联放大级的放大器并入增益分布控制
公开(公告)号：US4464633A
公开(公告)日：1984-08-07
申请号：US363869
申请日：1982-03-31
CPC分类号： H03G1/0023
摘要： A pair of differential amplifier stages are connected in cascade to form a multistage amplifier for signal amplification purposes. The base-emitter paths of current source transistors which establish the operating currents for the respective stages are connected in series across a common source of forward bias voltage. The collector-emitter path of an additional transistor is shunted across the base-emitter path of one of the current source transistors. As biasing of the additional transistor is varied, the distribution of gain between the respective cascaded stages is altered substantially without disturbance of the overall gain of the multistage amplifier.
摘要翻译： 一对差分放大器级级联连接形成用于信号放大的多级放大器。 建立各个级的工作电流的电流源晶体管的基极 - 发射极路径串联连接在共同的正向偏置电压源上。 附加晶体管的集电极 - 发射极路径跨过电流源晶体管之一的基极 - 发射极路径分流。 随着附加晶体管的偏置改变，各级联级之间的增益分布基本上改变，而不影响多级放大器的总体增益。
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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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3.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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4.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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5.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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6.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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8.发明授权Frequency selective DC coupled video signal control system insensitive to video signal DC components 失效频率选择性直流耦合视频信号控制系统对视频信号直流分量不敏感
公开(公告)号：US4388648A
公开(公告)日：1983-06-14
申请号：US310138
申请日：1981-10-09
CPC分类号： H04N5/205 , H03H11/1213
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. The detector is preceded in the control path by a frequency selective network comprising an amplifier and a filter for shaping the frequency response of the control path such that high frequency video signal components exclusive of DC video signal components are passed to the peak detector. The frequency selective network comprises the cascode combination of a video signal amplifier transistor and a current source transistor which provides quiescent operating currents for the amplifier transistor. The filter is coupled to the junction of the amplifier and current source transistors, and includes a DC blocking network coupled between the junction and a point of reference potential.
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，用于开发代表除了视频信号DC分量的视频信号的高频内容的控制电压。 检测器在控制路径之前由包括放大器和滤波器的频率选择网络在前，用于对控制路径的频率响应进行整形，使得排除DC视频信号分量的高频视频信号分量被传递到峰值检测器。 频率选择网络包括视频信号放大器晶体管和为放大器晶体管提供静态工作电流的电流源晶体管的共源共栅组合。 滤波器耦合到放大器和电流源晶体管的结，并且包括耦合在结点和参考点之间的DC阻挡网络。
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公开(公告)号：US4371896A
公开(公告)日：1983-02-01
申请号：US296823
申请日：1981-08-27
CPC分类号： H04N5/185
摘要： Input video signals are applied to a video signal processor via an AC coupling capacitor and an input impedance. A gated control circuit operates periodically to develop a DC control voltage for establishing the DC black reference level of the video signal, at which time the control circuit forms a feedback loop with the video processor. The DC feedback control voltage is coupled via a feedback impedance to the AC coupling capacitor, which stores the control voltage, at the video processor input. The AC coupling capacitor exhibits a low impedance at signal frequencies, such that the input and feedback impedances form a voltage divider for sufficiently reducing the AC signal gain of the feedback loop to prevent the feedback control loop from oscillating at AC signal frequencies.
摘要翻译： 输入视频信号通过AC耦合电容器和输入阻抗施加到视频信号处理器。 门控控制电路周期性地工作以产生用于建立视频信号的DC黑参考电平的DC控制电压，此时控制电路与视频处理器形成反馈回路。 直流反馈控制电压通过反馈阻抗耦合到视频处理器输入处的存储控制电压的交流耦合电容器。 AC耦合电容器在信号频率处呈现低阻抗，使得输入和反馈阻抗形成分压器，以充分降低反馈回路的AC信号增益，以防止反馈控制回路在交流信号频率下振荡。
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10.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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