公开(公告)号：US4621289A

公开(公告)日：1986-11-04

申请号：US591741

申请日：1984-03-21

申请人： Stan Bart ,  Gopal K. Srivastava

发明人： Stan Bart ,  Gopal K. Srivastava

IPC分类号： H04N5/08

CPC分类号： H04N5/08

摘要： Composite sync is separated from video despite noisy, weak, or nonstandard signal conditions. Sync is separated from the composite video signal by comparing the video signal to a D.C. reference voltage which is generated depending upon the particular characteristics of the received video signal. Outputted sync signals during vertical sync and nonstandard periods are conditioned for proper phasing in other receiver circuits such as the Horizontal A.P.C.

摘要翻译： 复合同步与视频分离，尽管有噪声，弱或非标准的信号条件。 通过将视频信号与根据接收的视频信号的特定特性产生的直流参考电压进行比较，将同步与复合视频信号分离。 在垂直同步和非标准周期期间的输出同步信号被调节以适用于其它接收机电路，例如水平A.P.C.

公开(公告)号：US4322664A

公开(公告)日：1982-03-30

申请号：US184718

申请日：1980-09-08

申请人： Stan Bart ,  George J. Tzakis

发明人： Stan Bart ,  George J. Tzakis

IPC分类号： H03K4/50 ,  H03K4/502 ,  H01J29/70 ,  H01J29/76

CPC分类号： H03K4/502 ,  H03K4/50

摘要： A ramp generator is described for developing a ramp voltage for use in vertically deflecting the electron beam or beams of a television receiver. The ramp generator receives a vertical rate pulse developed by the receiver for developing a charging current during the occurrence of the vertical rate pulse. A discharging current is also generated, and both currents are applied to a capacitor for developing a ramp voltage which increases and then decreases in amplitude. A clamp circuit in the generator is enabled when the vertical pulse is received for clamping the ramp voltage on the capacitor to a predetermined peak voltage via low impedance path such that unwanted voltage components are substantially eliminated from the ramp voltage during the clamping action.

摘要翻译： 描述了斜坡发生器用于开发用于垂直偏转电视接收机的电子束或横梁的斜坡电压。 斜坡发生器接收由接收器开发的垂直速率脉冲，用于在垂直速率脉冲发生期间产生充电电流。 也产生放电电流，并且将两个电流施加到电容器，用于产生增加然后在幅度上减小的斜坡电压。 当接收到垂直脉冲以将电容器上的斜坡电压通过低阻抗路径钳位到预定峰值电压时，发生器中的钳位电路被使能，使得在钳位动作期间基本上消除了斜坡电压中的不需要的电压分量。

公开(公告)号：US4723165A

公开(公告)日：1988-02-02

申请号：US935425

申请日：1986-11-26

申请人： Stan Bart

发明人： Stan Bart

IPC分类号： H04N5/08 ,  H04N5/06

CPC分类号： H04N5/08

摘要： A novel method and apparatus of AC coupling composite video sync information to a sync separator circuitry with digital controlled filtered DC feedback is described. An AC coupling circuit such as a capacitor provides an intermediate signal in response to received composite video. The intermediate signal may be level adjusted and gain provided to provide a first input to a sync slicer and an input to a sync filter. The output of the sync filter may provide a second input to the sync slicer circuit which responsively varies the reference level for the sync slicer in repsonse to variations in the level of the received composite video. DC feedback from the filter to the AC coupling circuit provides for a stabilization in the intermediate signal and in the filter output signal. These two signals ultimately provide the input to the sync slicer so that the composite sync is provided in response to all sync signals in spite of level variations in the sync tips in the received composite video signal.

摘要翻译： 描述了将复合视频同步信息AC耦合到具有数字受控滤波DC反馈的同步分离器电路的新颖方法和装置。 诸如电容器的AC耦合电路响应于接收到的复合视频而提供中间信号。 可以对中间信号进行电平调整，并提供增益以提供同步限幅器的第一输入和到同步滤波器的输入。 同步滤波器的输出可以向同步限幅器电路提供第二输入，其响应于接收的复合视频的电平的变化响应地改变同步限幅器的参考电平。 从滤波器到AC耦合电路的DC反馈提供了中间信号和滤波器输出信号中的稳定性。 这两个信号最终提供给同步限幅器的输入，使得尽管接收到的复合视频信号中的同步提示中的电平变化，但是响应于所有同步信号来提供复合同步。

公开(公告)号：US4318036A

公开(公告)日：1982-03-02

申请号：US205819

申请日：1980-11-10

申请人： Stan Bart ,  Gopal K. Srivastava

发明人： Stan Bart ,  Gopal K. Srivastava

IPC分类号： H04N3/223 ,  H01J29/70 ,  H01J29/76

CPC分类号： H04N3/223

摘要： A pulse width modulator is described for width-modulating horizontal rate pulses developed in a television receiver and for applying the width-modulated pulses to the receiver's horizontal drive system. In the illustrated embodiment, the modulator includes a differential amplifier which senses the receiver's high voltage and beam current to develop a control signal which varies in accordance with variations in the beam current and the high voltage. A second differential amplifier receives the control signal and horizontal rate pulses for developing pulses whose width is varied in response to variations in the control signal. The width-modulated pulses cause the horizontal drive system to generate a substantially constant horizontal picture size despite variations in line voltage and brightness.

摘要翻译： 描述了用于在电视接收机中产生的宽度调制水平速率脉冲并且将宽度调制脉冲施加到接收机的水平驱动系统的脉冲宽度调制器。 在所示实施例中，调制器包括差分放大器，其感测接收机的高电压和波束电流，以产生根据波束电流和高电压的变化而变化的控制信号。 第二差分放大器接收用于显影脉冲的控制信号和水平速率脉冲，其宽度响应于控制信号的变化而变化。 尽管线路电压和亮度有变化，但宽度调制脉冲使得水平驱动系统产生基本上恒定的水平图像尺寸。