-
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。
-
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。
-
3.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。
-
公开(公告)号：US4623924A
公开(公告)日：1986-11-18
申请号：US702618
申请日：1985-02-19
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。
-
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。
-
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。
-
7.发明授权Chrominance signal phase locked loop system for use in a digital television receiver having a line-locked clock signal 失效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
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。
-
公开(公告)号：US4661853A
公开(公告)日：1987-04-28
申请号：US794222
申请日：1985-11-01
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。
-
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。
-
10.发明授权Amplifier incorporating gain distribution control for cascaded amplifying stages 失效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
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。
-
-
-
-
-
-
-
-
-
搜索结果
55 条记录 (耗时 0.037 秒)
