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1. 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。

2. 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。

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

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。

5. 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。

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

US4716462A Motion adaptive television signal processing system 失效
标题翻译：运动自适应电视信号处理系统
公开(公告)号：US4716462A
公开(公告)日：1987-12-29
申请号：US934923
申请日：1986-11-25
申请人： Robert A. Wargo , Leopold A. Harwood , Dalton H. Pritchard , Michael S. Chartier
发明人： Robert A. Wargo , Leopold A. Harwood , Dalton H. Pritchard , Michael S. Chartier
IPC分类号： H04N5/14 , H04N5/44 , H04N9/78 , H04N11/04 , H04N5/21
CPC分类号： H04N5/144 , H04N7/012 , H04N9/78
摘要： A motion adaptive television signal processing system is disclosed. An image change estimator estimates the image change over an image time interval. A television signal processor adaptively processes the signal in response to a control signal. A control signal generator is coupled between the image change estimator and the adaptive television signal processor. The control signal generated exhibits a function substantially described by: K=Ae.sup.-b/x where K is the value of the control signal, A is the maximum value the control signal can attain, x is the estimated image change, and b is a constant. In a second embodiment, a second estimator estimates a parameter of the television signal. The relationship of the control signal to the estimated image change is varied as a function of the estimated parameter.
摘要翻译：公开了一种运动自适应电视信号处理系统。图像变化估计器估计图像时间间隔上的图像变化。电视信号处理器响应于控制信号自适应地处理信号。控制信号发生器耦合在图像改变估计器和自适应电视信号处理器之间。所产生的控制信号具有基本描述的功能：K = Ae-b / x其中K是控制信号的值，A是控制信号可以获得的最大值，x是估计的图像变化，b是不变。在第二实施例中，第二估计器估计电视信号的参数。控制信号与估计图像变化的关系作为估计参数的函数而变化。

8. 发明授权

US4626894A Signal filtering system having adaptively cascaded filter stages for developing a variable bandwidth frequency characteristic 失效
标题翻译：具有自适应级联滤波器级的信号滤波系统，用于开发可变带宽频率特性
公开(公告)号：US4626894A
公开(公告)日：1986-12-02
申请号：US657592
申请日：1984-10-04
申请人： Leopold A. Harwood , Robert A. Wargo
发明人： Leopold A. Harwood , Robert A. Wargo
IPC分类号： H04N9/78 , H03H21/00 , H04N9/64
CPC分类号： H03H21/0012 , H04N9/646
摘要： An adaptive filtering system is disclosed. The system is used in a digital television receiver to extract low frequency vertical detail information from a comb filtered chrominance signal. This system provides wide bandwidth vertical detail information when the amplitude of the chrominance component of the composite video signal is low and narrower bandwidth vertical detail signals as the amplitude of the chrominance component increases. Adaptive filtering is accomplished by passing the comb filtered chrominance signal through a first low-pass filter, developing two reduced amplitude replicas of the filtered signal which are mutually supplementary. The ratio of the amplitudes of these two replicas is variable with a control signal. One replica is passed through a second low-pass filter and combined with the other replica to produce a vertical detail signal. The embodiment of the system that is disclosed includes means for developing a control signal that is proportional to the instantaneous amplitude of the chrominance component of the composite video signal.
摘要翻译：公开了一种自适应滤波系统。该系统用于数字电视接收机，从梳状滤波色度信号中提取低频垂直细节信息。当复合视频信号的色度分量的幅度低时，该系统提供宽带宽垂直细节信息，随着色度分量的幅度增加，带宽垂直细节信号变窄。通过将梳状滤波后的色度信号通过第一低通滤波器来实现自适应滤波，从而形成两个相互补充的滤波信号的两个降幅复制品。这两个副本的振幅比可以用控制信号来变化。一个副本通过第二个低通滤波器并与其他副本组合以产生垂直细节信号。所公开的系统的实施例包括用于开发与复合视频信号的色度分量的瞬时幅度成比例的控制信号的装置。

9. 发明授权

US4623924A Video signal auto peaking circuitry 失效
标题翻译：视频信号自动峰值电路
公开(公告)号：US4623924A
公开(公告)日：1986-11-18
申请号：US702618
申请日：1985-02-19
申请人： Robert A. Wargo , Leopold A. Harwood
发明人： Robert A. Wargo , Leopold A. Harwood
IPC分类号： H04N5/208 , H04N5/205 , H04N5/14
CPC分类号： H04N5/205
摘要： A peaking circuit for use in a digital video signal processing system includes a digital peak detector which produces a peak magnitude whenever the slope of the video signal changes polarity. The peak magnitudes, and the absences of peaks are summed in an accumulator over a field period. The accumulated peaks are applied to a gain calculating circuit which develops a peaking control signal having three regimes. For low valued accumulated peaks the gain or peaking control signal is constant and relatively large. For high valued accumulated peaks the gain is constant and negative. In between the gain is in inverse porportion to the value of the accumulated peaks.
摘要翻译：用于数字视频信号处理系统的峰化电路包括数字峰值检测器，每当视频信号的斜率改变极性时产生峰值幅度。峰值的幅度和峰值的缺席在场周期的累加器中求和。累积的峰值被施加到增益计算电路，其产生具有三个方案的峰值控制信号。对于低值累积峰值，增益或峰值控制信号是恒定的并且相对较大。对于高价值累积峰值，增益是恒定的和负的。在两者之间，增益与累积峰值的数值成反比。

10. 发明授权

US4670665A Digital pulse width detector 失效
标题翻译：数字脉宽检测器
公开(公告)号：US4670665A
公开(公告)日：1987-06-02
申请号：US760911
申请日：1985-07-31
申请人： Leopold A. Harwood , Robert A. Wargo
发明人： Leopold A. Harwood , Robert A. Wargo
IPC分类号： H04N9/68 , G01R23/15 , G01R29/027 , H03K5/00 , H03K5/1252 , H03K5/153 , H03K5/19 , H03K5/22 , H03K5/13
CPC分类号： G01R29/0273 , G01R23/15
摘要： Apparatus for passing digital pulses from a bilevel digital signal source having widths wider than a given minimum and narrower than a given maximum is described. A first duration sensitive signal gate is coupled to the signal source and passes only signals having widths wider than the given minimum duration. A second duration sensitive signal gate is also coupled to the signal source and passes only signals having widths equal to or wider than the given maximum duration. A signal selection means is coupled to the first and second duration sensitive signal gates, and passes pulses which have been passed by the first but not the second duration sensitive signal gate.
摘要翻译：描述了用于从二维数字信号源传递数字脉冲的装置，其宽度大于给定最小值并且比给定最大值更窄的宽度。第一持续时间敏感信号门耦合到信号源，并且仅传递宽度大于给定最小持续时间的宽度的信号。第二持续时间敏感信号门也耦合到信号源，并且仅传递具有等于或大于给定最大持续时间的宽度的信号。信号选择装置耦合到第一和第二持续时间敏感信号门，并且通过已被第一但不是第二持续时间敏感信号门通过的脉冲。

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