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1. 发明授权

US4253110A Automatic kinescope beam current limiter with sequential control modes 失效
标题翻译：具有顺序控制模式的自动显象管光束限流器
公开(公告)号：US4253110A
公开(公告)日：1981-02-24
申请号：US103445
申请日：1979-12-14
申请人： Leopold A. Harwood , Erwin J. Wittmann , Robert L. Shanley, II
发明人： Leopold A. Harwood , Erwin J. Wittmann , Robert L. Shanley, II
IPC分类号： H04N5/59 , H04N9/535 , H04N5/58
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。

2. 发明授权

US4263610A Controlled output composite keying signal generator for a television receiver 失效
标题翻译：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
申请人： Robert L. Shanley, II , Leopold A. Harwood , Erwin J. Wittmann
发明人： Robert L. Shanley, II , Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H04N9/77 , H04N9/44 , H04N9/46
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

3. 发明授权

US4203131A Predictable automatic brightness control circuit in a video signal image reproducing system 失效
标题翻译：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
申请人： Leopold A. Harwood , Erwin J. Wittmann , Robert L. Shanley, II
发明人： Leopold A. Harwood , Erwin J. Wittmann , Robert L. Shanley, II
IPC分类号： H04N5/57 , H04N9/73 , H04N17/04 , H04N5/16
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。

4. 发明授权

US4318051A Symmetrically gain controlled differential amplifier 失效
标题翻译：对称增益控制差动放大器
公开(公告)号：US4318051A
公开(公告)日：1982-03-02
申请号：US107401
申请日：1980-01-15
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H03G1/00 , H03G3/10 , H03F3/45
CPC分类号： H03G1/0023 , H03G3/10
摘要： An arrangement for symmetrically gain controlling a differential amplifier is disclosed. A control circuit including first and second similarly arranged transistors coupled between points of operating potential develops first and second control voltages of prescribed magnitude at collector outputs of the transistors. The first transistor is biased to provide the first control voltage at a fixed, prescribed level related to the gain control bias requirements of the amplifier. The second control voltage varies symmetrically with respect to the first control voltage in response to the setting of a potentiometer coupled to a bias circuit of the second transistor. The potentiometer is connected directly between points of operating potential such that the control voltages are equal for a center potentiometer setting, and the second control voltage varies symmetrically with respect to the first control voltage as the potentiometer is adjusted between minimum and maximum extremes to thereby produce symmetrical amplifier gain control. Symmetrical gain control is predictable and independent of potentiometer tolerance effects and variations of the operating potentials associated with the control circuit.
摘要翻译：公开了一种用于对称增益控制差分放大器的装置。耦合在工作电位点之间的包括第一和第二类似布置的晶体管的控制电路在晶体管的集电极输出处产生预定幅度的第一和第二控制电压。第一晶体管被偏置以提供与放大器的增益控制偏置要求相关的固定的规定电平的第一控制电压。响应于耦合到第二晶体管的偏置电路的电位器的设置，第二控制电压相对于第一控制电压对称地改变。电位器直接连接在工作电位点之间，使得控制电压相对于中心电位器设置相等，并且第二控制电压相对于第一控制电压对称地变化，因为电位计在最小和最大极值之间被调节，从而产生对称放大器增益控制。对称增益控制是可预测的，与电位器公差效应和与控制电路相关的工作电位的变化无关。

5. 发明授权

US4143398A Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals 失效
标题翻译：自动亮度控制电路采用闭合控制环路，对大型放大器视频信号的破坏进行稳定
公开(公告)号：US4143398A
公开(公告)日：1979-03-06
申请号：US888932
申请日：1978-03-22
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H04N5/57 , H04N5/16 , H04N9/535
CPC分类号： H04N5/57
摘要： Brightness control apparatus in a video system employing a sample and hold circuit including a charge storage capacitor. The sample and hold circuit forms a closed control loop with a signal processing channel, and is keyed during periodic blanking intervals of the video signal to sample the magnitude of a reference voltage and a brightness representative blanking level of the video signal. The sample and hold circuit provides an output control signal indicative of the voltage difference between the reference voltage and the blanking level. The control signal is applied to the signal channel for translating the blanking level in a direction to minimize the voltage difference, so that a desired relationship between the reference voltage and the blanking level is preserved. In a preferred embodiment, a diode coupled between a sampling transistor and the capacitor assures that the capacitor is not charged improperly in the event the normal current conducting mode of the transistor is disrupted in the presence of large amplitude video signals, thereby preventing operation of the closed control loop from being disrupted.

6. 发明授权

US4485353A PLL Oscillator synchronizing system with matrix for phase correction 失效
标题翻译： PLL振荡器同步系统与矩阵进行相位校正
公开(公告)号：US4485353A
公开(公告)日：1984-11-27
申请号：US383263
申请日：1982-05-28
申请人： Ta-Fang Fang , Erwin J. Wittmann , Leopold A. Harwood , Jack Craft
发明人： Ta-Fang Fang , Erwin J. Wittmann , Leopold A. Harwood , Jack Craft
IPC分类号： H03B5/32 , H03B5/36 , H03L7/099 , H04N9/45 , H03L7/08
CPC分类号： H04N9/45 , H03L7/099
摘要： Color reference oscillator in a color television receiver comprises a non-inverting amplifier, with positive feedback from its output conveyed via a crystal filter to its input. A quadrature phase shift network, coupled to the filter output, develops phase shifted signals which are matrixed with signals derived directly from the non-inverting amplifier to form resultant signals with a phase intermediate the phases of the matrix inputs. Control voltage outputs of a phase comparator, responsive to oscillator signals and to received synchronizing bursts, determine the magnitude and polarity of the output of a controlled amplifier which has at its input the resultant signals produced by said matrixing. The controlled amplifier output, and the output of an inverting amplifier also responsive to said resultant signals, share the load resistor of the non-inverting amplifier. Matrixing parameters and magnitude of inverting amplifier output are selected to eliminate adverse effects of undesired phase lag associated with the load circuit of the non-inverting amplifier.
摘要翻译：彩色电视接收机中的彩色参考振荡器包括一个非反相放大器，其输出端通过晶体滤波器向其输入端输出正反馈。耦合到滤波器输出的正交相移网络产生相移信号，该信号由直接从非反相放大器导出的信号进行矩阵化，以形成具有中间相位矩阵输入的相位的合成信号。响应于振荡器信号和接收的同步脉冲串，相位比较器的控制电压输出确定受控放大器的输出的幅度和极性，该控制放大器在其输入端由所述矩阵产生的合成信号。受控放大器输出以及反相放大器的输出也响应所述合成信号，共享非反相放大器的负载电阻。选择反相放大器输出的矩阵参数和幅值，以消除与非反相放大器负载电路相关的不期望的相位滞后的不利影响。

7. 发明授权

US4249199A Phase compensated controlled oscillator 失效
标题翻译：相位补偿控制振荡器
公开(公告)号：US4249199A
公开(公告)日：1981-02-03
申请号：US82469
申请日：1979-10-09
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H03B5/00 , H03L7/099 , H04N9/45 , H04N9/455 , H04N9/46
CPC分类号： H04N9/455
摘要： A controlled oscillator comprises an amplifier including an active device, a filter network arranged in a feedback loop of the amplifier for providing regenerative feedback to sustain oscillation of the amplifier, and a source of control signals. Output oscillatory signals from the amplifier and output control signals from the control source are summed by a combining network to produce a resultant controlled signal, which is coupled to the filter network. Parasitic capacitances associated with output terminals of the amplifier and control source impart an unwanted phase shift to the controlled signal. A compensation signal derived from the oscillator is supplied to the combining network with a magnitude and phase to offset the unwanted phase shift, to thereby produce a phase compensated resultant controlled signal.
摘要翻译：受控振荡器包括放大器，其包括有源器件，布置在放大器的反馈环路中的滤波器网络，用于提供用于维持放大器的振荡的再生反馈和控制信号源。来自放大器的输出振荡信号和来自控制源的输出控制信号由组合网络相加，以产生耦合到滤波器网络的合成受控信号。与放大器和控制源的输出端相关联的寄生电容对受控信号施加不希望的相移。从振荡器得到的补偿信号被提供给具有幅度和相位的组合网络以抵消不想要的相移，从而产生相位补偿的合成受控信号。

8. 发明授权

US4229759A Signal detector including sample and hold circuit with reduced offset error 失效
标题翻译：信号检测器包括采样和保持电路，减少偏移误差
公开(公告)号：US4229759A
公开(公告)日：1980-10-21
申请号：US936039
申请日：1978-08-23
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H03L7/06 , G11C27/02 , H03D13/00 , H03L7/091 , H04N9/45 , H04N9/455 , H04N9/46 , H03B3/04
CPC分类号： H04N9/455 , G11C27/024 , H03D13/008 , H03L7/091
摘要： A sample and hold detector arrangement suitable for construction in integrated circuit form as an automatic chroma gain control detector, or a color oscillator AFPC detector, or the like. A wide bandwidth analog multiplier circuit is supplied with an intermittent reference signal and a second signal, the phase or amplitude of which is to be sampled. In a preferred embodiment, the reference signal corresponds to the burst component of a composite color television signal and the second signal corresponds to a locally generated color subcarrier signal. The multiplier provides oppositely phased output signals which are coupled to first and second sample and hold circuits. Each sample and hold circuit is keyed to concurrently sample the respective multiplier outputs for the same sampling interval, and each provides substantially symmetrical bidirectional conduction to associated filter capacitors during the sampling interval and a high holding impedance during the remainder of each cycle.
摘要翻译：适用于集成电路形式的采样和保持检测器装置，作为自动色度增益控制检测器或彩色振荡器AFPC检测器等。宽带模拟乘法器电路被提供有间歇参考信号和第二信号，其相位或幅度将被采样。在优选实施例中，参考信号对应于复合彩色电视信号的突发分量，第二信号对应于本地产生的彩色副载波信号。乘法器提供相反的相位输出信号，其耦合到第一和第二采样和保持电路。每个采样和保持电路都被键入，以便以相同的采样间隔对相应的乘法器输出进行采样，并且每个采样和保持电路在采样间隔期间提供基本对称的双向导通到相关滤波电容器，并且在每个周期的剩余时间内提供高保持阻抗。

9. 发明授权

US4385311A Filter and phase shift circuit for a television automatic flesh color correction system 失效
标题翻译：用于电视自动肉色校正系统的滤波器和相移电路
公开(公告)号：US4385311A
公开(公告)日：1983-05-24
申请号：US249947
申请日：1981-04-01
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H04N9/64 , H04N9/535
CPC分类号： H04N9/643
摘要： A frequency selective signal translating circuit is disclosed for use in a color television receiver including an automatic flesh tone color correction network which provides a reference signal for color demodulators of the receiver. The circuit comprises an input bandpass filter for attenuating unwanted frequency components from the reference signal output of the correction network. The filter is followed by a phase shifter for shifting the phase of the filtered reference signal as required for proper demodulator operation. The filter comprises a fixed alignment, single-tuned, series resonant circuit coupled in series between the correction network output and the demodulator reference signal inputs.
摘要翻译：公开了一种用于彩色电视接收机的频率选择信号转换电路，包括为接收机的彩色解调器提供参考信号的自动肤色调色网络。该电路包括用于从校正网络的参考信号输出衰减不需要的频率分量的输入带通滤波器。滤波器之后是移相器，用于根据滤波的参考信号的相位移位以适当的解调器操作。滤波器包括串联在校正网络输出和解调器参考信号输入之间的固定对准单调谐串联谐振电路。

10. 发明授权

US4325076A Electronic filter for generating a third harmonic signal 失效
标题翻译：用于产生三次谐波信号的电子滤波器
公开(公告)号：US4325076A
公开(公告)日：1982-04-13
申请号：US147580
申请日：1980-05-08
申请人： Leopold A. Harwood , Erwin J. Wittmann
发明人： Leopold A. Harwood , Erwin J. Wittmann
IPC分类号： H04N9/44 , G01S13/53 , H03B19/00 , H03B21/00 , H03B21/02 , H04N9/78 , H04N11/04 , H04N9/535
CPC分类号： H04N9/78 , G01S13/53 , H03B19/00
摘要： An integratable third harmonic signal generator comprises an amplitude limiting amplifier, a linear amplifier, and a signal combining network. A sinusoidal input signal is coupled to the limiter and linear amplifiers. The limiting amplifier generates a square wave signal containing a first harmonic (fundamental) component at the frequency of the input signal, and higher order odd harmonics including a desired third harmonic frequency. The signal gain of the linear amplifier is set so that the magnitude of the output signal from the linear amplifier is sufficient to cancel with the first harmonic of the square wave output signal from the limiter amplifier, when these output signals are combined in the combining network. A resulting signal developed at the output of the combining network contains the desired third harmonic component, as well as higher order harmonics at acceptably reduced levels relative to the third harmonic component, to the substantial exclusion of the first harmonic component.
摘要翻译：可积分的三次谐波信号发生器包括限幅放大器，线性放大器和信号组合网络。正弦输入信号耦合到限幅器和线性放大器。限幅放大器产生包含输入信号频率的一次谐波（基波）分量的方波信号，以及包括期望的三次谐波频率的高阶奇次谐波。线性放大器的信号增益被设定为使得来自线性放大器的输出信号的幅度足以抵消来自限幅放大器的方波输出信号的一次谐波，当这些输出信号组合在组合网络中时。在组合网络的输出处产生的产生的信号包含期望的三次谐波分量以及相对于三次谐波分量可接受地降低的电平的高次谐波到基本排除第一谐波分量。

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