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1. 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。

2. 发明授权

US5168246A Error amplifier for multiple frequency oscillator control 失效
标题翻译：用于多频率振荡器控制的误差放大器
公开(公告)号：US5168246A
公开(公告)日：1992-12-01
申请号：US783446
申请日：1991-10-24
申请人： Kishan R. Pulluru , Gopal K. Srivastava
发明人： Kishan R. Pulluru , Gopal K. Srivastava
IPC分类号： H03L7/093 , H03L7/10 , H04N5/05 , H04N5/12
CPC分类号： H03L7/093 , H03L7/10 , H04N5/05 , H04N5/126
摘要： A multiple frequency scan oscillator control system includes a phase locked loop operative upon a scan oscillator to provide phase and frequency synchronization thereof to a periodic reference signal. A static phase error correction is operative to provide adjustment of the free-running or static frequency of the scan oscillator. An error amplifier includes a pair of intercoupled differential amplifier configurations one having a constant current source and the other having a frequency dependent current source which responds to a frequency dependent bias current to alter amplifier gain. A threshold detection circuit includes a differential amplifier pair coupled to a pair of switching circuits for establishing a threshold action in response to system error voltage to indicate large magnitude error voltages and signal the need for free-running frequency adjustment of the oscillator.
摘要翻译：多频扫描振荡器控制系统包括在扫描振荡器上工作的锁相环，以向周期性参考信号提供相位和频率同步。静态相位误差校正可用于提供扫描振荡器的自由运行或静态频率的调节。误差放大器包括一对相互耦合的差分放大器配置，一个具有恒定电流源，另一个具有频率相关电流源，其响应频率依赖偏置电流以改变放大器增益。阈值检测电路包括耦合到一对开关电路的差分放大器对，用于响应于系统误差电压建立阈值动作，以指示大的幅度误差电压，并且指示需要振荡器的自由运行频率调节。

3. 发明授权

US5455493A Multisync horizontal drive generator 失效
标题翻译：多相同步水平驱动发电机
公开(公告)号：US5455493A
公开(公告)日：1995-10-03
申请号：US132064
申请日：1993-10-04
申请人： Kishan R. Pulluru , Khosro M. Rabii
发明人： Kishan R. Pulluru , Khosro M. Rabii
IPC分类号： G09G1/04 , H03K3/0231 , H03K4/502 , H01J29/70 , H01J29/76
CPC分类号： G09G1/04 , H03K3/0231 , H03K4/502
摘要： A multisync horizontal drive generator for use in a television receiver or computer monitor display is operative in response to an applied horizontal scan synchronizing signal. A delay network couples the horizontal sync signal to a gated detector which compares the delayed horizontal sync signal to a differentiated horizontal scan flyback signal to produce an error signal. A gain adjustable error amplifier couples the error signal to a summing network which includes a nominal frequency input. A range control detects the frequency of the horizontal drive signal and applies a range control signal to the summing network. The combined signal inputs are coupled from the summing network to a signal controllable current source which drives a saw forming network to produce a horizontal scan signal. A multiscan decoder controls a pair of current mirrors in response to a multiscan code input to couple the output currents of the current mirror to the saw former to produce horizontal scan drive signals having frequency multiples of the horizontal sync frequency.
摘要翻译：响应于所施加的水平扫描同步信号，用于电视接收机或计算机监视器显示器的多相同水平驱动发生器是可操作的。延迟网络将水平同步信号耦合到门控检测器，其将延迟水平同步信号与差分水平扫描反激信号进行比较以产生误差信号。增益可调误差放大器将误差信号耦合到包括标称频率输入的求和网络。范围控制检测水平驱动信号的频率，并将范围控制信号施加到求和网络。组合信号输入从求和网络耦合到信号可控电流源，其驱动锯形成网络以产生水平扫描信号。多声道解码器响应于多声码输入来控制一对电流镜，以将电流镜的输出电流耦合到锯形器以产生具有水平同步频率的倍数的水平扫描驱动信号。

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