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1. 发明授权

US4607283A Vertical picture centering circuit 失效
标题翻译：垂直图像中心电路
公开(公告)号：US4607283A
公开(公告)日：1986-08-19
申请号：US593341
申请日：1984-03-26
申请人： Gopal K. Srivastava , Julian E. Warrick
发明人： Gopal K. Srivastava , Julian E. Warrick
IPC分类号： H04N3/227 , H04N5/04
CPC分类号： H04N3/227
摘要： The present invention discloses a device and method for compensating for the time lag associated with circuitry within the television receiver when recognizing vertical sync. Accordingly, one aspect of the present invention introduces a static phase correction into the vertical drive sequence for a standard signal so that the television picture is more nearly vertically centered on the screen. Additional aspects of the invention provide for compatibility with other circuits in the television receiver. Specifically, a delay generator coordinates with the phase correcter and other phase and frequency monitoring circuits so that the receiver is not needlessly triggered into nonstandard operation.
摘要翻译：本发明公开了一种用于在识别垂直同步时补偿与电视接收机内的电路相关的时滞的装置和方法。因此，本发明的一个方面在标准信号的垂直驱动序列中引入静态相位校正，使得电视图像在屏幕上更靠近中心。本发明的另外的方面提供了与电视接收机中的其他电路的兼容性。具体来说，延迟发生器与相位校正器和其它相位和频率监视电路协调，使接收器不必要地被触发成非标准操作。

2. 发明授权

US5247229A Adaptive scan control having horizontal scan locked clock system 失效
标题翻译：具有水平扫描锁定时钟系统的自适应扫描控制
公开(公告)号：US5247229A
公开(公告)日：1993-09-21
申请号：US822476
申请日：1992-01-17
申请人： Duc Ngo , Kishan R. Pulluru , Gopal K. Srivastava
发明人： Duc Ngo , Kishan R. Pulluru , Gopal K. Srivastava
IPC分类号： H03L7/081 , H04N5/12
CPC分类号： H04N5/126 , H03L7/081
摘要： A television receiver includes conventional systems for receiving a broadcast type signal and displaying the received signal upon a cathode ray tube. Vertical and horizontal scan system oscillators and controls produce vertical and horizontal scan signal synchronized to the reference sync signals. A scan clock system cooperates with the horizontal oscillator and control system to produce horizontal scan related signals which are synchronized to the CRT scan.
摘要翻译：电视接收机包括用于接收广播型信号并在阴极射线管上显示接收信号的常规系统。垂直和水平扫描系统振荡器和控制器产生与参考同步信号同步的垂直和水平扫描信号。扫描时钟系统与水平振荡器和控制系统配合产生与CRT扫描同步的水平扫描相关信号。

3. 发明授权

US5121086A PLL including static phase error responsive oscillator control 失效
标题翻译： PLL包括静态相位误差响应振荡器控制
公开(公告)号：US5121086A
公开(公告)日：1992-06-09
申请号：US682484
申请日：1991-04-09
申请人： Gopal K. Srivastava
发明人： Gopal K. Srivastava
IPC分类号： H03L7/085 , H03L7/14
CPC分类号： H03L7/085 , H03L7/148
摘要： A static phase error responsive oscillator control includes a phase detector coupled to a source of horizontal synchronizing pulses, a low pass filter, an error amplifier, a voltage controlled oscillator having a frequency equal to a multiple of the horizontal scan frequency, and a corresponding frequency divider. A threshold detector responds to error signals in excess of predetermined upper and lower thresholds to indicate large magnitude frequency corrections. An averaging circuit determines the long term character of the large magnitude corrections to alter the free-running or static frequency of the oscillator. Once the free-running frequency is corrected, static phase error is substantially reduced or eliminated.
摘要翻译：静态相位误差响应振荡器控制包括耦合到水平同步脉冲源的相位检测器，低通滤波器，误差放大器，具有等于水平扫描频率的倍数的频率的压控振荡器，以及对应频率分隔线阈值检测器响应超过预定的上限和下限阈值的误差信号以指示大幅度频率校正。平均电路确定大幅度校正的长期字符以改变振荡器的自由运行或静态频率。一旦自由运行频率被校正，静态相位误差被显着地减少或消除。

4. 发明授权

US4446482A System for generating 2H pulses in a television receiver 失效
标题翻译：用于在电视接收机中产生2H脉冲的系统
公开(公告)号：US4446482A
公开(公告)日：1984-05-01
申请号：US365421
申请日：1982-04-05
申请人： Gopal K. Srivastava , Stephen H. Lai
发明人： Gopal K. Srivastava , Stephen H. Lai
IPC分类号： H04N5/06 , H04N9/40
CPC分类号： H04N5/06
摘要： A system for generating 2H pulses by counting cycles of reference signals whose frequency is related to the frequency of a color subcarrier signal. In one embodiment, four such reference signals are provided, each phase separated from the other by ninety degrees. A counter receives one of the reference signals for counting its cycles up to a preselected integral count. When the preselected count is reached, further circuitry generates an output pulse for clearing the counter and holding it cleared while the next reference signal is applied to the counter. The cycle of counting reference signal cycles, clearing the counter, and applying the next reference signal to the counter continues such that the four reference signals are applied to the counter sequentially. By proper selection of the integral count reached by the counter and the duration of its cleared state, the output pulses are developed at a 2H rate.
摘要翻译：通过对频率与彩色副载波信号的频率相关的参考信号的周期进行计数来产生2H个脉冲的系统。在一个实施例中，提供四个这样的参考信号，每个相位彼此分开九十度。计数器接收一个参考信号，用于对其周期进行计数，直到预选的积分计数。当达到预选计数时，进一步的电路产生一个输出脉冲，用于清除计数器并保持清零，同时下一个参考信号施加到计数器。继续计数参考信号周期，清除计数器以及将下一个参考信号应用于计数器的周期，使得四个参考信号顺序地应用于计数器。通过适当选择计数器达到的积分计数和清除状态的持续时间，输出脉冲以2H速率显影。

5. 发明授权

US4360825A Vertical drive generator and horizontal rate gate generator for a television receiver 失效
标题翻译：用于电视接收机的垂直驱动发生器和水平速率门发生器
公开(公告)号：US4360825A
公开(公告)日：1982-11-23
申请号：US219086
申请日：1980-12-22
申请人： Gopal K. Srivastava
发明人： Gopal K. Srivastava
IPC分类号： H04N9/44 , H04N9/46 , H04N5/06
CPC分类号： H04N9/44
摘要： A vertical drive generator and a horizontal gating generator are described which time-share circuitry common to both generators to provide vertical drive pulses and horizontal gating pulses for use in a television receiver. The vertical drive generator converts variable width vertical rate pulses to constant width vertical drive pulses in a manner such that the duration of each drive pulse is determined by a digital counter. In the interval between the generation of successive vertical drive pulses, the counter is reset to provide timing control for the gating generator. In the preferred embodiment, the latter generator develops AGC gating pulses and burst gating pulses at selected times and for selected durations.
摘要翻译：描述了垂直驱动发生器和水平门控发生器，这两个发生器共用的时间共享电路提供用于电视接收机的垂直驱动脉冲和水平门控脉冲。垂直驱动发生器以可变宽度垂直速率脉冲转换为恒定宽度的垂直驱动脉冲，使得每个驱动脉冲的持续时间由数字计数器确定。在产生连续的垂直驱动脉冲之间的间隔中，计数器被复位以提供门控发生器的定时控制。在优选实施例中，后者发电机在所选择的时间和选定的持续时间内产生AGC门控脉冲和脉冲门控脉冲。

6. 发明授权

US4318036A Pulse width modulator for a television receiver 失效
标题翻译：用于电视接收机的脉宽调制器
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。

7. 发明授权

US5187568A Video processor having improved clamping system for color television receivers 失效
标题翻译：视频处理器具有改进的彩色电视接收机的夹紧系统
公开(公告)号：US5187568A
公开(公告)日：1993-02-16
申请号：US770511
申请日：1991-10-03
申请人： Gopal K. Srivastava
发明人： Gopal K. Srivastava
IPC分类号： H04N9/72
CPC分类号： H04N9/72
摘要： A television receiver includes a frequency multiplexed video processor which processes chrominance and luminance signals in response to synchronously detected composite video information. The composite video signal is separated into a plurality of frequency spectra which are individually processed utilizing digital electronic circuitry to achieve high performance and cost effectiveness. A comb filter is operative within one of the processors to provide separation of the luminance and chrominance information within the chrominance signal bandpass to maintain high frequency luminance signal components. A separate processor and bandpass filter are operative to provide separate control of the luminance peaking within the system. Separation of chrominance band signals from the luminance signal prior to video clamping provides a burst-free backporch for improved video clamping in a digital video processor. Conventional luminance and chrominance processing converts the output signals of the multiplexed processor to RGB video signals which are applied to a conventional cathode ray tube display having a conventional deflection system associated therewith.
摘要翻译：电视接收机包括频率复用视频处理器，其响应于同步检测到的复合视频信息来处理色度和亮度信号。复合视频信号被分离成多个频谱，其使用数字电子电路单独处理以实现高性能和成本效益。梳状滤波器在一个处理器内工作，以提供色度信号带通内的亮度和色度信息的分离，以保持高频亮度信号分量。单独的处理器和带通滤波器可操作以提供对系统内的亮度峰值的单独控制。在视频钳位之前将色度带信号与亮度信号分离，提供了一种无突变的后向，用于改进数字视频处理器中的视频钳位。传统的亮度和色度处理将多路复用的处理器的输出信号转换成RGB视频信号，该RGB视频信号被应用于具有与之相关联的常规偏转系统的常规阴极射线管显示器。

8. 发明授权

US5126639A Sequential scan system changes for multiple frequency range oscillator and control 失效
标题翻译：多频率振荡器和控制的顺序扫描系统更改
公开(公告)号：US5126639A
公开(公告)日：1992-06-30
申请号：US724622
申请日：1991-07-02
申请人： Gopal K. Srivastava
发明人： Gopal K. Srivastava
IPC分类号： H03L7/189 , H04N5/12
CPC分类号： H03L7/189 , H04N5/126
摘要： An adaptive oscillator control system includes a phase locked loop together with a static phase error correction system and external scan system components. An oscillator range control includes a processor having a plurality of established oscillator frequency ranges which are identified by oscillator range code numbers. A first frequency approximation is provided based upon either an oscillator range code number or a known standard scan frequency. A frequency detector provides a second frequency approximation and a confidence circuit examines oscillator consistency and enables the phase locked loop. Thereafter, a lock detector responds to the occurence of frequency and phase lock by the phase lock loop to enable the static phase error corrector and deactivate the oscillator range control system. The lock detector upon detecting horizontal synchronization, for broadcast type video, increases the second frequency approximation range. The system changes oscillator frequency and tuning and adjusts external sweep components such as phase locked loop filter, horizontal yoke tuning, and drive signal applied to the horizontal output amplifier after lock.
摘要翻译：自适应振荡器控制系统包括锁相环以及静态相位误差校正系统和外部扫描系统组件。振荡器范围控制包括具有由振荡器范围代码号标识的多个已建立的振荡器频率范围的处理器。基于振荡器范围代码号或已知标准扫描频率来提供第一频率近似。频率检测器提供第二频率近似，置信电路检查振荡器的一致性并启用锁相环。此后，锁定检测器响应锁相环的频率和相位锁定的发生，以使静态相位误差校正器和停用振荡器范围控制系统。锁定检测器在检测水平同步时，对于广播型视频，增加了第二频率近似范围。系统改变振荡器频率和调谐，并调整锁定后施加到水平输出放大器的外部扫描部件，如锁相环滤波器，水平磁轭调谐和驱动信号。

9. 发明授权

US4507682A Self-gated AGC detector 失效
标题翻译：自门AGC检测器
公开(公告)号：US4507682A
公开(公告)日：1985-03-26
申请号：US441124
申请日：1982-11-12
申请人： Gopal K. Srivastava
发明人： Gopal K. Srivastava
IPC分类号： H04N5/53 , H04N5/52
CPC分类号： H04N5/53
摘要： An AGC gate signal generating circuit for a television receiver comprises a series RC circuit having a time constant for developing a charging current at a relatively slow rate in relation to a horizontal scanning line of a video signal and at a relatively fast rate in relation to a field of the video signal. The AGC gate signal is developed at the collector of a transistor whose base is coupled for receiving the video signal and whose emitter is coupled to the node formed between the resistor and capacitor of the RC circuit. The transistor is responsive to a nomimal level video signal for assuming a non-conductive state during horizontal scanning lines for charging the capacitor to a level below the video black level and for assuming a conductive state during horizontal sync intervals for discharging the capacitor to produce the collector current AGC gate signal. The transistor further assumes a conductive state for producing the AGC gate signal in response to a number of horizontal scanning lines of a reduced level video signal substantially less than a full field.
摘要翻译：一种用于电视接收机的AGC门信号产生电路，包括一个串联RC电路，具有时间常数，用于相对于视频信号的水平扫描线以相对较慢的速率显影充电电流，并以相对较快的速率相对于视频信号的字段。 AGC栅极信号在其基极耦合用于接收视频信号并且其发射极耦合到形成在RC电路的电阻器和电容器之间的节点的晶体管的集电极处显影。晶体管响应于等级视频信号，以在水平扫描线期间假设非导通状态，以将电容器充电到低于视频黑电平的电平，并且在水平同步间隔期间假定导通状态以放电电容器以产生集电极电流AGC门控信号。晶体管进一步采取导通状态，以响应于基本上小于全场的降低电平视频信号的水平扫描线的数量来产生AGC门信号。

10. 发明授权

US4344084A VIR Correction system 失效
标题翻译： VIR校正系统
公开(公告)号：US4344084A
公开(公告)日：1982-08-10
申请号：US231635
申请日：1981-02-04
申请人： Christopher M. Engel , Gopal K. Srivastava , George J. Tzakis
发明人： Christopher M. Engel , Gopal K. Srivastava , George J. Tzakis
IPC分类号： H04N9/64 , H04N9/535
CPC分类号： H04N9/64
摘要： A VIR Correction system is disclosed for use in a system such as a color television receiver. Television signals of the type under consideration include a plurality of video lines, each line having a standard color burst and video chrominance. On line 19 of each television field, a VIR signal is transmitted which includes a VIR color burst and a VIR chrominance reference. The correction system includes an amplitude comparator for sensing the difference in amplitude between the VIR color burst and the VIR chrominance reference, and for developing an amplitude error signal indicative of the sensed difference. A phase comparator develops a phase error signal on sensing a phase difference between the VIR color burst and the VIR chrominance reference. A phase controller receives at least the standard color burst portion of the television signal and responds to the phase error signal for correcting the phase of the standard color burst. A gain controller receives at least the video chrominance portion of the television signal and responds to the amplitude error signal for correcting the amplitude of the video chrominance.
摘要翻译：公开了用于诸如彩色电视接收机的系统中的VIR校正系统。正在考虑的类型的电视信号包括多条视频线，每行具有标准色同步信号和视频色度。在每个电视场的线路19上，发送包括VIR彩色脉冲串和VIR色度参考的VIR信号。该校正系统包括一个振幅比较器，用于感测VIR色同步脉冲和VIR色度参考之间的幅度差，并用于产生一个表示感测差值的振幅误差信号。相位比较器在感测VIR色同步信号和VIR色度参考之间的相位差时产生相位误差信号。相位控制器至少接收电视信号的标准彩色脉冲串部分，并响应相位误差信号以校正标准色同步信号的相位。增益控制器至少接收电视信号的视频色度部分，并响应于用于校正视频色度幅度的幅度误差信号。

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