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1.发明授权
公开(公告)号：US4466015A
公开(公告)日：1984-08-14
申请号：US428591
申请日：1982-09-30
申请人： Robert A. Wargo , Stuart S. Perlman
发明人： Robert A. Wargo , Stuart S. Perlman
CPC分类号： H04N9/68
摘要： An automatic color burst magnitude control (ACC) for a digital television receiver is compatible with and is unaffected by variation of the phase of the color subcarrier signal introduced in demodulating the color subcarrier to effect control of tint. ACC is effectuated by digital gain control for scaling the digital words representing the sampled magnitudes of the color subcarrier burst signal. Quadrature demodulation of the color subcarrier signal produces color signal digital words I and Q which are each sampled and latched during the color subcarrier burst. The averages of the sampled I and Q digital words are applied as respective portions of the address of a read only memory (ROM). The ROM provides error words indicating whether the chroma burst amplitude is too large or too small. A control device responds to the error word to scale the color subcarrier digital words, and therefore scale the chroma burst amplitude to a predetermined magnitude.
摘要翻译： 用于数字电视接收机的自动色同步幅度控制（ACC）与在解调彩色副载波中引入的彩色副载波信号的相位的变化兼容并且不受影响，从而实现色调的控制。 ACC通过数字增益控制实现，用于缩放表示彩色副载波突发信号的采样幅度的数字字。 彩色副载波信号的正交解调产生在彩色副载波突发期间被采样和锁存的彩色信号数字字I和Q。 采样I和Q数字字的平均值被应用为只读存储器（ROM）的地址的相应部分。 ROM提供指示色度突发幅度是否太大或太小的错误字。 控制装置响应错误字以缩放彩色副载波数字字，并因此将色度脉冲串幅度缩放到预定的大小。
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公开(公告)号：US4686561A
公开(公告)日：1987-08-11
申请号：US760910
申请日：1985-07-31
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。
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公开(公告)号：US4716462A
公开(公告)日：1987-12-29
申请号：US934923
申请日：1986-11-25
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。
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公开(公告)号：US4636735A
公开(公告)日：1987-01-13
申请号：US724644
申请日：1985-04-18
申请人： Robert A. Wargo
发明人： Robert A. Wargo
摘要： Clocked control signals are applied from a source to the input of delay means having a plurality of successive signal takeoff points, with the delay between successive ones of said takeoff points being the same (e.g., a period at the signal clocking frequency, f.sub.CL). An "and" gate is provided with a plurality of inputs equal in number to the plurality of takeoff points. Each takeoff point is linked by a signal path to a respectively different one of the "and" gate inputs. A succession of two-input "or" gates is provided, with one input of each "or" gate coupled to receive the output of the "and" gate. The last of the succession of "or" gates is coupled to a control signal output terminal. The output of each of the remainder of said succession is coupled via a respectively different one of a plurality of similar delay devices to the other input of the next succeeding one of said succession of "or" gates. Each of the delay devices imparts a delay equal to a period at f.sub.CL. The other input of the first of said succession of "or" gates is coupled to directly receive the control signal source output.
摘要翻译： 时钟控制信号从源提供到具有多个连续信号起飞点的延迟装置的输入，所述起飞点的连续的相位之间的延迟是相同的（例如，信号时钟频率fCL的周期）。 “和”门具有与多个起飞点数相等的多个输入。 每个起飞点通过信号路径链接到“和”门输入中的相应不同的一个。 提供了一连串的双输入“或”门，每个“或”门的一个输入端耦合以接收“和”门的输出。 “或”门的连续的最后一个耦合到控制信号输出端子。 所述连续的剩余部分中的每一个的输出经由多个类似的延迟装置中的分别不同的一个耦合到所述一系列“或”门中的下一个后续的一个的另一个输入。 每个延迟装置产生等于fCL周期的延迟。 所述连续的“或”门中的第一个的另一个输入被耦合以直接接收控制信号源输出。
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公开(公告)号：US4670665A
公开(公告)日：1987-06-02
申请号：US760911
申请日：1985-07-31
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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公开(公告)号：US4630102A
公开(公告)日：1986-12-16
申请号：US659452
申请日：1984-10-10
CPC分类号： H04N9/68
摘要： A system for detecting overload conditions of a chrominance signal in which the chrominance signal is compared to a predetermined maximum desired amplitude value. Occurrences of the chrominance signal exceeding the predetermined amplitude are considered to be overload conditions only if the duration of the particular occurrence continues for an interval determined by the noise content of the chrominance signal. The average value of the chrominance signal over the internal is calculated to represent the overload signal.
摘要翻译： 一种用于检测色度信号的过载条件的系统，其中色度信号与预定的最大期望幅度值进行比较。 只有当特定发生的持续时间持续了由色度信号的噪声含量确定的间隔时，才将超过预定幅度的色度信号的出现视为过载状态。 计算内部色度信号的平均值，以表示过载信号。
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公开(公告)号：US4682213A
公开(公告)日：1987-07-21
申请号：US791145
申请日：1985-10-24
申请人： Robert A. Wargo
发明人： Robert A. Wargo
CPC分类号： H04N9/646
摘要： A hanging dot detector for a video signal processor including a comb filter is disclosed. The respective phases of the signals in the band of frequencies normally containing color representative information of both the comb filtered chrominance and luminance signals are detected. The magnitude of the changes of the respective comb filtered luminance and chrominance phase angle signals over a given time period are compared. A control signal is generated in response to the comparison of the changes over the period of time of the respective phases. A signal coupling unit couples the comb filtered luminance signal to the luminance processing channel. In response to the control signal, the signal coupling means alters the frequency composition of the comb filtered luminance signal so as to eliminate the color representative information. A further embodiment is disclosed to process a complementary-color vertical transition condition.
摘要翻译： 公开了一种用于包括梳状滤波器的视频信号处理器的悬点检测器。 检测通常包含梳状滤波色度和亮度信号两者的颜色代表信息的频带中的信号的各个相位。 比较在给定时间段内各个梳状滤波亮度和色度相位角信号的变化幅度。 响应于各相的时间段上的变化的比较而产生控制信号。 信号耦合单元将梳状滤波的亮度信号耦合到亮度处理通道。 响应于控制信号，信号耦合装置改变梳状滤波亮度信号的频率合成，以消除颜色代表信息。 公开了另一实施例来处理互补色垂直转变条件。
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公开(公告)号：US4413282A
公开(公告)日：1983-11-01
申请号：US328434
申请日：1981-12-07
申请人： Robert A. Wargo
发明人： Robert A. Wargo
CPC分类号： H04N5/211
摘要： A method and apparatus are presented for detecting the presence of ghost signal contamination of a video signal by examining the picture information interval of the video signal. A baseband video signal is detected and examined to detect signal transitions. Transitions of the main video signal of a given polarity will be followed by corresponding transitions of a ghost signal. The time intervals between ones of the transitions are measured and stored. If a ghost signal is present, the time interval between corresponding ghost and signal transitions will occur more frequently than the relatively random time intervals between transitions of the main signal and the ghost signal considered separately. By correlating the time interval measurements, the recurring time interval between corresponding main and ghost signal transitions can be identified. This information may then be used to adjust the delay of a delay line in a ghost cancellation system.
摘要翻译： 提出了一种通过检查视频信号的图像信息间隔来检测视频信号的重影信号污染的存在的方法和装置。 检测并检查基带视频信号以检测信号转换。 给定极性的主视频信号的转换将伴随着重影信号的相应转变。 测量并存储转换之间的时间间隔。 如果存在幽灵信号，相应的重影和信号转换之间的时间间隔将比分别考虑的主信号和重影信号的转换之间相对随机的时间间隔更频繁地发生。 通过关联时间间隔测量，可以识别相应的主信号和重影信号转换之间的循环时间间隔。 然后可以使用该信息来调整重影消除系统中的延迟线的延迟。
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公开(公告)号：US4402013A
公开(公告)日：1983-08-30
申请号：US328436
申请日：1981-12-07
申请人： Robert A. Wargo
发明人： Robert A. Wargo
CPC分类号： H04N5/211
摘要： Apparatus is provided which is responsive to a video signal for producing a position-modulated pulse train which is representative of the occurrence of transitions of the video signal. A transversal filter is responsive to the video signal and produces a differentiated replica of the video signal over a given band of frequencies. The output of the transversal filter contains transitional information of the video signal occupying a range of frequencies which is to be analyzed. Information representing transitions of positive, negative, or both polarities is then compared to a given threshold value. Signal transitions exceeding the threshold are converted to pulses, thereby producing a train of pulses representing significant transitions of a desired polarity or polarities. The times of occurrence of the pulses are then analyzed to generate a control signal for controlling a given characteristic of the video signal during processing.
摘要翻译： 提供了一种响应于视频信号以产生代表视频信号的转变的发生的位置调制脉冲串的装置。 横向滤波器响应于视频信号并且在给定频带上产生视频信号的差分复制品。 横向滤波器的输出包含占据要分析的频率范围的视频信号的过渡信息。 然后将表示正极性，负极性或两极性的跃迁的信息与给定的阈值进行比较。 超过阈值的信号转换被转换为脉冲，从而产生一系列脉冲，表示所需极性或极性的显着转变。 然后分析脉冲的发生次数以产生用于在处理期间控制视频信号的给定特性的控制信号。
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10.发明授权Signal filtering system having adaptively cascaded filter stages for developing a variable bandwidth frequency characteristic 失效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
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。
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