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公开(公告)号：US5345272A
公开(公告)日：1994-09-06
申请号：US940878
申请日：1992-11-03
CPC分类号： H04N7/0122 , H04N3/223 , H04N3/27 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N9/641
摘要： Video luminance data from a video signal is selectably compressed and expanded in a first signal path including a first line memory. A second line memory in a parallel signal path processes video chrominance data from the video signal. A control circuit generates respective timing signals for writing data into each of the first and second memories and for reading data from each of first and second the line memories. A timing delay circuit for the control circuit, has video compression and expansion modes of operation. During the compression mode, reading of the second line memory is delayed relative to writing of the second line memory. During the expansion mode, writing of the first line memory is delayed relative to writing of the second line memory or reading of the second line memory is delayed relative to writing of the second line memory. The duration of the timing delays can be selected from a range of values. The line memories are first in first out (FIFO) devices having independently enabled write and read ports.
摘要翻译： PCT No.PCT / US91 / 03813 Sec。 371日期：1992年11月3日 102（e）1992年11月3日的PCT日期1991年5月30日提交。视频信号的视频亮度数据在包括第一行存储器的第一信号路径中被可选择地压缩和扩展。 并行信号路径中的第二行存储器从视频信号处理视频色度数据。 控制电路产生用于将数据写入第一和第二存储器的每一个并用于从第一和第二行存储器中的每一个读取数据的定时信号。 一种用于控制电路的定时延迟电路，具有视频压缩和扩展操作模式。 在压缩模式期间，相对于第二行存储器的写入，第二行存储器的读取被延迟。 在扩展模式期间，第一行存储器的写入相对于第二行存储器的写入而延迟，或者第二行存储器的读取相对于第二行存储器的写入而延迟。 时间延迟的持续时间可以从值的范围中选择。 行存储器是先进先出（FIFO）设备，具有独立使能的写和读端口。
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公开(公告)号：US5309111A
公开(公告)日：1994-05-03
申请号：US904632
申请日：1992-06-26
CPC分类号： H04N5/95
摘要： Apparatus for measuring skew in a clock signal for processing a video signal includes a cascade connection of a plurality of analog delay elements to which the clock signal is applied. The output connections of each analog delay element is coupled to a data input terminal of a respective storage element. A signal representative of the horizontal synchronizing signal is applied to the storage elements to simultaneously latch signal into the respective storage elements, thereby capturing a representative cycle of the sampling clock signal in the storage elements. Decoding circuitry is coupled to the storage elements for detecting the relative position of the e.g., leading transition of the sampling clock pulse immediately preceding the trailing transition of the horizontal pulse A ratio is calculated indicative of the skew error, which ratio corresponds to the position of the first transition, in units of delay, divided by the duration of the sampling clock period, in units of delay. In one embodiment presented, the ratio is a measure, as a fraction of a clock period, of the time interval between a predetermined transition of the horizontal synchronizing signal and the leading transition of the first sampling clock pulse following such predetermined transition.
摘要翻译： 用于测量用于处理视频信号的时钟信号中的偏斜的装置包括施加时钟信号的多个模拟延迟元件的级联连接。 每个模拟延迟元件的输出连接耦合到相应存储元件的数据输入端。 表示水平同步信号的信号被施加到存储元件，以将信号同时锁存到相应的存储元件中，由此捕获存储元件中的采样时钟信号的代表性周期。 解码电路耦合到存储元件，用于检测紧接在水平脉冲的拖尾转换之前的采样时钟脉冲的例如前导转变的相对位置，计算表示偏斜误差的比率，该比率对应于 以延迟为单位的第一个转换除以采样时钟周期的持续时间，以延迟为单位。 在所呈现的一个实施例中，该比率是水平同步信号的预定转变与这种预定转换之后的第一采样时钟脉冲的前导转变之间的时间间隔的时间周期的一小部分的度量。
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公开(公告)号：US5249049A
公开(公告)日：1993-09-28
申请号：US817236
申请日：1992-01-06
CPC分类号： H04N7/0122 , H04N21/4858 , H04N21/4882 , H04N21/814 , H04N3/223 , H04N3/27 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N9/641 , Y10S348/913
摘要： A video display control system, comprises a video display having a first format display ratio. A picture height circuit determines an active video picture height from an input video signal having a second format display ratio. A detector circuit identifies letterbox formats responsive to the active video picture height in the video signal and determines a format display ratio of the letterbox picture. A zoom control circuit is operable in a first mode of operation for enlarging the picture in size to fill the display substantially entirely, notwithstanding consequent cropping of the picture, and operable in a second mode of operation for enlarging the picture in size to substantially fill the display vertically, notwithstanding consequent unused portions of the display. A vertical pan control circuit automatically centers the picture in both modes of operation. The detector can identify the format display ratio of the letterbox format picture a circuit responsive to the identified format display ratio controls image aspect ratio distortion of the enlarged picture. A deflection system is controllable in vertical size by a variable vertical scan rate, in horizontal size by variable horizontal video expansion and compression, and in pan position by varying the vertical reset in phase.
摘要翻译： 一种视频显示控制系统，包括具有第一格式显示比率的视频显示器。 图像高度电路从具有第二格式显示比的输入视频信号确定有效视频图像高度。 检测器电路根据视频信号中的有效视频图像高度识别信箱格式，并确定信箱图像的格式显示比。 变焦控制电路可操作在第一操作模式中，用于放大图像的大小以便基本上完全填充显示器，尽管随后裁剪了图像，并且可在第二操作模式中操作以放大图像尺寸以基本上填充 尽管显示器的未被使用的部分也是垂直显示的。 垂直摇摄控制电路在两种操作模式下自动使画面居中。 检测器可以识别信箱格式图像的格式显示比，响应于所识别的格式显示比率控制放大图像的图像宽高比失真的电路。 偏转系统在垂直尺寸上可控垂直扫描速率可变，水平尺寸可变水平视频展开和压缩，并可通过相位垂直复位改变在平移位置。
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公开(公告)号：US5309234A
公开(公告)日：1994-05-03
申请号：US7390
申请日：1993-01-21
CPC分类号： H04N7/0122 , H04N3/22 , H04N5/45 , H04N7/007 , Y10S348/913
摘要： A video display control system automatically controls a video display responsive to detection of letterbox format input video signals having varying format display ratios. A detection circuit continuously detects the first and last lines of active video in a video signal. A memory stores scan line numbers corresponding to the first and last lines of active video. The height of the picture is determined from the scan line numbers of the first and last lines of active video. The picture height is indicative of the format display ratio of the letterbox input. A comparator circuit compares the picture height to a threshold corresponding to the widest expected format display ratio of a letterbox input signal. A control circuit, for example a microprocessor, is operable in a first mode of operation for enabling the memory to continuously update the stored scan line numbers unless the picture height exceeds the threshold, and operable in a second mode of operation for enabling the memory to update the stored scan line numbers when active video is detected in a video line corresponding to a scan line number less than the stored first line or greater than the stored last line. At least one of picture size and picture cropping on the display means is controlled responsive to the picture height. A circuit for initiating the first mode of operation after the second mode of operation can operate automatically or manually.
摘要翻译： 视频显示控制系统响应于具有变化的格式显示比率的信箱格式输入视频信号的检测而自动控制视频显示。 检测电路连续地检测视频信号中的有效视频的第一行和最后一行。 存储器存储对应于活动视频的第一行和最后一行的扫描行号。 图像的高度由活动视频的第一行和最后一行的扫描行号决定。 图片高度表示信箱输入的格式显示比率。 比较器电路将图像高度与对应于信箱输入信号的最宽预期格式显示比的阈值进行比较。 控制电路（例如微处理器）可操作在第一操作模式中，以使得存储器能够连续地更新所存储的扫描线号，除非图像高度超过阈值，并且可在第二操作模式中操作以使存储器 在对应于小于存储的第一行的扫描行号或大于存储的最后一行的视频行中检测到活动视频时，更新存储的扫描行号。 响应于图像高度来控制显示装置上裁剪的图像尺寸和图像中的至少一个。 用于在第二操作模式之后启动第一操作模式的电路可以自动或手动操作。
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