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1. 发明授权

US4700217A Chrominance signal phase locked loop system for use in a digital television receiver having a line-locked clock signal 失效
标题翻译：色度信号锁相环系统，用于具有线锁时钟信号的数字电视接收机
公开(公告)号：US4700217A
公开(公告)日：1987-10-13
申请号：US893185
申请日：1986-08-05
申请人： Alvin R. Balaban , Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel
发明人： Alvin R. Balaban , Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel
IPC分类号： H04N9/45 , H04N9/66
CPC分类号： H04N9/45 , H04N9/66
摘要： A digital television receiver which uses a line-locked clock signal employs chrominance signal demodulation circuitry which produces a digital oscillatory signal that is locked in phase to the color reference burst signal component of the incoming video signals. An analog voltage controlled oscillator generates an oscillatory signal having a frequency of approximately twice the color subcarrier frequency. This signal is combined with the composite video signals and the combined signal is digitized by an analog to digital converter. The digitized oscillatory signal is separated from the combined digital signal and is used to synchronize a digital phase locked loop. The digital phase locked loop generates two quadrature phase related signals having frequencies that are one-half the frequency of the analog oscillatory signal. These two signals are used to synchronously demodulate the chrominance signal components of the incoming video signals to obtain two quadrature phase related color difference signals. The control signal for the voltage controlled oscillator is generated by subtracting the burst phase of the demodulated color difference signals from a reference phase and integrating the difference.
摘要翻译：使用线锁时钟信号的数字电视接收机采用色度信号解调电路，其生成与输入视频信号的颜色参考突发信号分量锁相的数字振荡信号。模拟压控振荡器产生具有大约是彩色副载波频率的两倍的频率的振荡信号。该信号与复合视频信号组合，组合信号由模数转换器数字化。数字振荡信号与组合数字信号分离，用于同步数字锁相环。数字锁相环产生频率为模拟振荡信号频率的一半的两个正交相位相关信号。这两个信号用于同步解调输入视频信号的色度信号分量，以获得两个正交相位相关的色差信号。压控振荡器的控制信号通过从参考相位减去解调色差信号的脉冲串相位而积分该差而产生。

2. 发明授权

US4694327A Digital phase locked loop stabilization circuitry using a secondary digital phase locked loop 失效
标题翻译：数字锁相环路稳定电路采用次级数字锁相环
公开(公告)号：US4694327A
公开(公告)日：1987-09-15
申请号：US845850
申请日：1986-03-28
申请人： Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel , Alvin R. Balaban
发明人： Walter H. Demmer , Leopold A. Harwood , Chandrakant B. Patel , Alvin R. Balaban
IPC分类号： H03L7/06 , H03L7/087 , H03L7/099 , H03L7/22 , H04N9/45
CPC分类号： H04N9/45 , H03L7/0994 , H03L7/22
摘要： A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the sampling clock signal and develops a digital signal that is phase locked to the color burst signal. This digital signal is used as a regenerated color subcarrier signal to synchronously demodulate the chrominance components of the composite video signals into I and Q color difference signals. To compensate for frequency instability in the regenerated subcarrier signal caused by frequency instabilities in the line-locked clock signal, a third digital phase locked loop develops an output signal which is phase locked to a reference signal generated by a crystal controlled oscillator. Control signals from the third phase locked loop are applied to the second phase locked loop to substantially compensate for frequency instabilities in the regenerated subcarrier signal that are induced by the clock signals.
摘要翻译：数字电视接收机包括第一锁相环，其产生锁定到复合视频信号的水平线同步信号分量的采样时钟信号。第二数字锁相环由采样时钟信号计时，并产生与色同步信号锁相的数字信号。该数字信号用作再生彩色副载波信号，以将复合视频信号的色度分量同步解调为I和Q色差信号。为了补偿由线锁定时钟信号中的频率不稳定性引起的再生子载波信号中的频率不稳定性，第三数字锁相环产生锁相到由晶体振荡器产生的参考信号的输出信号。来自第三锁相环的控制信号被施加到第二锁相环，以基本上补偿由时钟信号引起的再生子载波信号中的频率不稳定性。

3. 发明授权

US4686560A Phase locked loop system including analog and digital components 失效
标题翻译：锁相环系统包括模拟和数字组件
公开(公告)号：US4686560A
公开(公告)日：1987-08-11
申请号：US868567
申请日：1986-05-30
申请人： Alvin R. Balaban , Chandrakant B. Patel , Walter H. Demmer , Leopold A. Harwood
发明人： Alvin R. Balaban , Chandrakant B. Patel , Walter H. Demmer , Leopold A. Harwood
IPC分类号： H03L7/06 , H03L7/087 , H04L5/06 , H04N9/45 , H04N9/66
CPC分类号： H04N9/45 , H03L7/087
摘要： A digital television receiver, having a line-locked clock, includes a partly digital, partly analog phase locked loop. This phase locked loop regenerates two quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of the composite video signals into two color informaiton signals. The phase locked loop includes an analog voltage controlled oscillator which generates a signal that is independent of any frequency instability in the line locked clock signal. An analog-to-digital converter digitizes this signal to provide one of the subcarrier signals. This subcarrier signal is applied to a read-only memory to generate the second subcarrier signal. The two color information signals are obtained by multiplying the chrominance signals by the first and second subcarrier signals. A phase comparator determines the phase of the vector sum of the two color information signals and compares this against a desired phase value to generate a phase difference signal. The phase difference signal is filtered and applied to a digital-to-analog converter which provides the frequency control signal for the analog voltage controlled oscillator. In a second embodiment of the invention, a tracking filter is inserted at the output port of the analog-to-digital converter to allow the quantization resolution of the analog-to-digital to be reduced without affecting the performance of the phase locked loop.
摘要翻译：具有线锁时钟的数字电视接收机包括部分数字部分模拟锁相环。该锁相环再生两个相位相关的副载波信号，用于将复合视频信号的色度信号分量同步解调成两个彩色信号信号。锁相环包括模拟压控振荡器，其产生独立于线路锁定时钟信号中的任何频率不稳定性的信号。模数转换器对该信号进行数字化以提供副载波信号之一。该子载波信号被施加到只读存储器以产生第二副载波信号。通过将色度信号乘以第一和第二子载波信号来获得两个颜色信息信号。相位比较器确定两个颜色信息信号的矢量和的相位，并将其与期望的相位值进行比较以产生相位差信号。相位差信号被滤波并施加到数模转换器，该转换器为模拟压控振荡器提供频率控制信号。在本发明的第二实施例中，跟踪滤波器被插入在模数转换器的输出端口，以允许在不影响锁相环的性能的情况下降低模拟数字的量化分辨率。

4. 发明授权

US4703340A Frequency division multiplexed analog to digital converter 失效
标题翻译：频分复用模数转换器
公开(公告)号：US4703340A
公开(公告)日：1987-10-27
申请号：US858720
申请日：1986-05-02
申请人： Alvin R. Balaban , Leopold A. Harwood , Chandrakant B. Patel , Walter H. Demmer
发明人： Alvin R. Balaban , Leopold A. Harwood , Chandrakant B. Patel , Walter H. Demmer
IPC分类号： H04N5/14 , H04N9/64 , H04N11/04 , H04N5/00
CPC分类号： H04N9/64
摘要： A digital television receiver, having a line locked clock, includes a first digital phase locked loop which regenerates quadrature phase related subcarrier signals that are used to synchronously demodulate the chrominance signal components of composite video signals into color information signals. When nonstandard video signals (e.g., from a video tape recorder) are processed by the receiver, frequency instabilities in the line locked clock signal may cause the color information signals to be distorted. To compensate for this distortion, a second phase locked loop is synchronized to a reference signal generated by an analog oscillator. The analog reference signal is linearly added to baseband analog video signals provided by a tuner. The combined signals are digitized by an analog-to-digital converter and then filtered by parallel low-pass and band-pass filters to develop digital signals representing the video signals and the reference signal, respectively. The digital reference signal is used to synchronize the second phase locked loop, the control signals of which are used to compensate the first phase locked loop for frequency instabilities in the clock signal.
摘要翻译：具有线锁定时钟的数字电视接收机包括第一数字锁相环，其再生用于将复合视频信号的色度信号分量同步解调为彩色信息信号的正交相位相关副载波信号。当非标准视频信号（例如，来自录像机）由接收机处理时，线路锁定时钟信号中的频率不稳定性可能导致颜色信息信号失真。为了补偿这种失真，第二个锁相环与由模拟振荡器产生的参考信号同步。模拟参考信号线性地添加到由调谐器提供的基带模拟视频信号。组合的信号由模拟数字转换器数字化，然后通过并行低通和带通滤波器进行滤波，以分别开发表示视频信号和参考信号的数字信号。数字参考信号用于同步第二锁相环，其控制信号用于补偿第一锁相环中的时钟信号中的频率不稳定性。

5. 发明授权

US4686561A Vertical detail information restoration circuit 失效
标题翻译：垂直细节信息恢复电路
公开(公告)号：US4686561A
公开(公告)日：1987-08-11
申请号：US760910
申请日：1985-07-31
申请人： Leopold A. Harwood , Robert A. Wargo , Chandrakant B. Patel
发明人： Leopold A. Harwood , Robert A. Wargo , Chandrakant B. Patel
IPC分类号： H04N9/78 , H04N5/208 , H04N9/64 , H04N9/77 , H04N5/21
CPC分类号： H04N9/646
摘要： In a composite color video signal, a portion of the signal spectrum is shared by high frequency vertical detail information, and high frequency modulated color difference (I) information. A circuit is described which determines whether the information in the shared frequency band is vertical detail information or color difference information without degradation in the presence of a step input signal, as, for example, in the presence of lettering in the image. A composite video signal is comb filtered to generate comb filtered chrominance and luminance signals. A baseband color difference signal is produced from the comb filtered chrominance signal and the presence of high frequency information in the baseband color difference signal is detected. The bandwidth of the low frequency portion of the comb filtered chrominance signal (i.e. the vertical detail information) which is restored to the comb filtered luminance signal is varied in response to the control signal.
摘要翻译：在复合彩色视频信号中，信号频谱的一部分由高频垂直细节信息和高频调制色差（I）信息共享。描述了一种电路，其确定在共享频带中的信息是垂直细节信息还是色差信息，而不存在步进输入信号的劣化，例如在图像中存在刻字。梳状滤波复合视频信号以产生梳状滤波色度和亮度信号。从梳状滤波色度信号产生基带色差信号，并检测基带色差信号中是否存在高频信息。梳状滤波色度信号的低频部分的带宽（即垂直细节信息）被恢复到梳状滤波的亮度信号，响应于控制信号而变化。

6. 发明授权

US4651196A Adaptive control of the chrominance signal frequency response in a video signal processing system 失效
标题翻译：视频信号处理系统中色度信号频率响应的自适应控制
公开(公告)号：US4651196A
公开(公告)日：1987-03-17
申请号：US713753
申请日：1985-03-19
申请人： Leopold A. Harwood , Chandrakant B. Patel
发明人： Leopold A. Harwood , Chandrakant B. Patel
IPC分类号： H04N9/64 , H04N9/77
CPC分类号： H04N9/646
摘要： A digital television receiver, which uses a comb filter to separate the luminance and chrominance components of composite video signals, includes an adaptive band-pass filter for processing the comb filtered chrominance signals. Comb filtered chrominance signals may include luminance vertical detail information at the relatively high frequencies also occupied by chrominance information. The adaptive band-pass filter is controlled to have a narrow bandwidth when significant amounts of this relatively high frequency vertical detail information are present and to have a wide bandwidth otherwise. Consequently, the bandwidth of the chrominance signal provided by this filter is restricted only when it is necessary to prevent distortion, and vertical detail is added to the luminance signal only when it is not likely to be contaminated with chrominance information.
摘要翻译：使用梳状滤波器分离复合视频信号的亮度和色度分量的数字电视接收机包括用于处理梳状滤波色度信号的自适应带通滤波器。梳状滤波的色度信号可以包括也被色度信息占据的相对高的频率的亮度垂直细节信息。当存在大量这种相对高频率的垂直细节信息并且否则具有宽带宽时，自适应带通滤波器被控制为具有窄带宽。因此，仅当需要防止失真时才限制由该滤波器提供的色度信号的带宽，并且仅当不可能被色度信息污染时才将亮度信号添加到亮度信号。

7. 发明授权

US4661853A Interfield image motion detector for video signals 失效
标题翻译：用于视频信号的场间图像运动检测器
公开(公告)号：US4661853A
公开(公告)日：1987-04-28
申请号：US794222
申请日：1985-11-01
申请人： Barbara J. Roeder , Leopold A. Harwood , Hermann J. Weckenbrock
发明人： Barbara J. Roeder , Leopold A. Harwood , Hermann J. Weckenbrock
IPC分类号： H04N7/32 , H04N5/14 , H04N5/21 , H04N9/77 , H04N9/78 , H04N11/04 , H04N7/18 , H04N5/213
CPC分类号： H04N5/21 , H04N5/144
摘要： A motion detector for determining image motion in a video signal develops an array of signals representing the difference between pixels from adjacent frames. The array of signals are grouped into subarrays, each of which include the signal corresponding to the pixel under examination for motion. Each of the subarrays are independently examined to determine if the magnitude of all of the pixel differences represented in a particular subarray exceed a predetermined threshold and/or the pixel differences have like polarity. If these conditions are met in any one of the subarrays, a motion signal is produced.
摘要翻译：用于确定视频信号中的图像运动的运动检测器产生表示来自相邻帧的像素之间的差异的信号阵列。信号阵列被分组成子阵列，每个子阵列包括对应于正在检查的运动像素的信号。独立地检查每个子阵列以确定在特定子阵列中表示的所有像素差异的大小是否超过预定阈值和/或像素差异具有相似的极性。如果在任何一个子阵列中满足这些条件，则产生运动信号。

8. 发明授权

US4562460A Manual hue control as for a digital TV 失效
标题翻译：数字电视的手动色调控制
公开(公告)号：US4562460A
公开(公告)日：1985-12-31
申请号：US487082
申请日：1983-04-21
申请人： Leopold A. Harwood
发明人： Leopold A. Harwood
IPC分类号： H04N9/64
CPC分类号： H04N9/643
摘要： A TV receiver arranged to process video signals in PCM binary format includes a manual hue control circuit which operates on the PCM color mixture signals to effectively rotate the vector sum of the color mixture signals while maintaining the magnitude of the sum substantially constant. The magnitude of the received vector sum is calculated and the angle between the sum and one of the color mixture signal components is determined. Circuitry under user control increments or decrements the angle to rotate the vector sum. Corrected color mixture signals are then generated by multiplying the magnitude of the calculated vector sum by the sine and cosine of the incremented angle.
摘要翻译：以PCM二进制格式处理视频信号的电视接收机包括手动色调控制电路，其操作PCM混色信号以有效地旋转混色信号的矢量和，同时保持总和的大小基本恒定。计算接收矢量和的大小，并确定和与混合信号分量之一之间的角度。用户控制下的电路增量或减小角度以旋转向量和。然后通过将计算的矢量和的大小乘以递增角度的正弦和余弦来产生校正的混合色彩信号。

9. 发明授权

US4464633A Amplifier incorporating gain distribution control for cascaded amplifying stages 失效
标题翻译：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
申请人： Leopold A. Harwood , Robert L. Shanley, II
发明人： Leopold A. Harwood , Robert L. Shanley, II
IPC分类号： H03G3/10 , H03G1/00 , H03G3/30
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。

10. 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.

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