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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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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：US5345270A
公开(公告)日：1994-09-06
申请号：US63480
申请日：1993-05-19
IPC分类号： H04N5/262 , H04N3/223 , H04N3/27 , H04N5/445 , H04N5/45 , H04N7/00 , H04N7/01 , H04N7/08 , H04N9/64 , H04N21/488 , H04N7/04 , H04N5/278
CPC分类号： H04N21/4884 , H04N3/223 , H04N3/27 , H04N5/44513 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N7/0122 , H04N7/08 , H04N9/641 , Y10S348/913
摘要： A video display control system comprises: a video display having a wide format display ratio; a letterbox detector for sampling video information in pictures represented by input video signals having a letterbox format and generating a control signal for enlarging the pictures for substantially filling the video display means with active video; and, a first control circuit for restricting operation of the letterbox detector to a vertical range of horizontal lines in each field of the video signal; and, a second control circuit for restricting operation of the letterbox detector to a horizontal range of video data in each of the horizontal lines.
摘要翻译： 视频显示控制系统包括：具有宽格式显示比率的视频显示器; 信箱检测器，用于对由具有信箱格式的输入视频信号表示的图像中的视频信息进行采样，并生成用于放大用于基本上用活动视频填充视频显示装置的图像的控制信号; 以及用于将信箱检测器的操作限制在视频信号的每个场中的水平线的垂直范围的第一控制电路; 以及用于将信箱检测器的操作限制在每条水平线中的视频数据的水平范围的第二控制电路。
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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：US5430494A
公开(公告)日：1995-07-04
申请号：US171141
申请日：1993-12-21
CPC分类号： H04N7/0122 , H04N3/223
摘要： A video display system comprises: a video display; first and second signal processors for cropping first and second video signals representative of first and second pictures; a circuit for generating a side-by-side display format of the pictures on the video display; and, a panning control circuit, responsive to panning command signals, for positioning said pictures in the side-by-side display format and for independently panning the pictures, as positioned. The panning control circuit generates independent fixed and variable delays for controlling line memories in the signal processors. Fixed delays control picture positions and variable delays control panning.
摘要翻译： 视频显示系统包括：视频显示器; 第一和第二信号处理器，用于裁剪表示第一和第二图像的第一和第二视频信号; 用于在视频显示器上产生图像的并排显示格式的电路; 以及响应于平移命令信号的平移控制电路，用于以并排显示格式定位所述图像，并且用于独立地平移作为定位的图像。 平移控制电路产生用于控制信号处理器中的线路存储器的独立固定和可变延迟。 固定延时控制图像位置和可变延迟控制平移。
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公开(公告)号：US5565928A
公开(公告)日：1996-10-15
申请号：US257980
申请日：1994-06-10
摘要： In a synchronizing circuit, an oscillator provides an output signal at a frequency that is a higher integral multiple than that of a synchronizing input signal. A control circuit, responsive to the input signal and a feedback signal representative of the output signal, generates a control signal that is indicative of a difference in phase or frequency between the input and output signals. The oscillator is responsive to the control signal for synchronized tracking of the output signal to the input signal. The control signal exhibits a periodic variation which tends to result in a deviation of the oscillator output signal from its synchronized tracking condition in accordance with the periodic variation. The phase of the output signal is offset relative to a corresponding phase of the periodic variation of the control signal for counteracting this deviation.
摘要翻译： 在同步电路中，振荡器以比同步输入信号高的整数倍的频率提供输出信号。 响应于输入信号和表示输出信号的反馈信号的控制电路产生指示输入和输出信号之间的相位或频率差的控制信号。 振荡器响应于控制信号，用于同步跟踪输入信号到输入信号。 控制信号表现出周期性变化，其倾向于导致振荡器输出信号与其同步跟踪条件根据周期性变化的偏差。 输出信号的相位相对于用于抵消该偏差的控制信号的周期性变化的相应相位偏移。
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公开(公告)号：US5625406A
公开(公告)日：1997-04-29
申请号：US674666
申请日：1996-07-02
CPC分类号： H04N5/4401 , H04N21/42638 , H04N21/42653 , H04N21/4345 , H04N21/435 , H04N5/44543 , H04N7/0887 , H04N5/44504
摘要： Analog and digital video signals are each representative of a picture and each may carry program guide information. A demultiplexer has the digital video signal as an input and the program guide information as an output. A demodulator has at least a luminance component of the analog video signal as an input and the program guide information as an output. A microprocessor, a video graphics adapter, the demultiplexer and the demodulator are interconnected by a data bus. Either of the program guide outputs is transferable to the video graphics adapter, which formats a graphics video signal representative of the program guide information. The graphics video signal and a selected one of the video signals are inputs to a multiplexer, which outputs a combined video signal representative of both the program guide information and the picture represented by the selected video signal.
摘要翻译： 模拟和数字视频信号各自表示图像，并且每个可以携带节目指南信息。 解复用器具有作为输入的数字视频信号和作为输出的节目指南信息。 解调器至少具有作为输入的模拟视频信号的亮度分量和作为输出的节目指南信息。 微处理器，视频图形适配器，解复用器和解调器通过数据总线相互连接。 节目指南输出中的任何一个都可传送到视频图形适配器，视频图形适配器格式化表示节目指南信息的图形视频信号。 图形视频信号和所选择的视频信号之一是输入到多路复用器，其输出表示节目指南信息和由所选择的视频信号表示的图像的组合视频信号。
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公开(公告)号：US5467144A
公开(公告)日：1995-11-14
申请号：US985683
申请日：1992-12-03
CPC分类号： H04N7/0122 , H04N5/45
摘要： A video display for a television apparatus has a wide format display ratio and is synchronized with a first video signal representative of first picture. A PIP processor is responsive to a second video signal representative of a second picture to define an auxiliary picture smaller in size than the video display. A FIFO line memory stores successive lines of video information representative of the auxiliary picture, which are combined with certain successive lines of video information representative of the first picture. A counter initialized at a time corresponding to the start of each horizontal line of the first video signal generates a variable time delay. A FIFO control circuit successively initiates a transfer of the lines of video information representative of the auxiliary picture from the line memory for combination with the video information representative of the main picture after the variable time delay. The variable time delay determines one of a plurality of horizontal panning positions of the auxiliary picture across all of the video display. A manually operable remote control can be used for adjusting the variable time delay.
摘要翻译： 电视机的视频显示器具有宽的格式显示比，并且与表示第一图像的第一视频信号同步。 PIP处理器响应于表示第二图像的第二视频信号来定义尺寸小于视频显示的辅助图像。 FIFO行存储器存储表示辅助图像的连续的视频信息行，其与表示第一图像的某些连续的视频信息行组合。 在与第一视频信号的每条水平线的开始相对应的时间处初始化的计数器产生可变时间延迟。 FIFO控制电路连续地启动表示来自行存储器的辅助画面的视频信息的行的传送，以与可变时间延迟之后的表示主画面的视频信息组合。 可变时间延迟确定辅助图像的所有视频显示的多个水平平移位置之一。 可以使用手动操作的遥控器来调节可变时间延迟。
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公开(公告)号：US5351087A
公开(公告)日：1994-09-27
申请号：US938233
申请日：1991-05-29
CPC分类号： H04N7/0122 , H04N3/223 , H04N3/27 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N9/641
摘要： A two stage interpolation system provides greater bandwidth for signals compressed and expanded by interpolation, for example video signals displayed in a zoom or enlarged mode. A finite impulse response filter generates from a first signal of digital samples a second signal of digital samples representing signal points between the samples of the first signal. The first signal is delayed, but otherwise substantially unmodified. The second signal and the delayed first signal are interleaved, for example by a multiplexer, to produce a third signal of digital values having a sample density twice that of the first signal. A compensated variable interpolator derives from the third signal a fourth signal of digital samples in which the frequency content of information represented by the first signal has been changed. The first signal can have frequency components as high as approximately 40% of the sampling rate for the first signal without significant reduction of bandwidth in the fourth signal, even when expanded. In the case of enlarging the picture represented by a video signal, the video signal can be truncated, for example in a FIFO line memory, prior to being delayed and processed by the finite impulse response filter. The compensated variable interpolator can be controlled, for example by a microprocessor or hardware equivalent, to provide selected ratios of compression or expansion.
摘要翻译： PCT No.PCT / US91 / 03734 Sec。 371日期：1992年10月23日 102（e）日期1992年10月23日PCT 1991年5月29日PCT PCT。 WO91 / 19393 PCT出版物 日期为1991年12月12日。两级插值系统为通过插值压缩和扩展的信号提供更大的带宽，例如以缩放或放大模式显示的视频信号。 有限脉冲响应滤波器从数字样本的第一信号产生表示第一信号的样本之间的信号点的数字样本的第二信号。 第一个信号被延迟，但是基本上未被修改。 第二信号和延迟的第一信号例如由多路复用器进行交织，以产生具有两倍于第一信号的采样密度的数字值的第三信号。 补偿的可变内插器从第三信号中导出数字采样的第四信号，其中由第一信号表示的信息的频率内容已经改变。 即使在扩展时，第一信号可以具有高达第一信号的采样率的大约40％的频率分量，而不会显着降低第四信号中的带宽。 在放大由视频信号表示的图像的情况下，视频信号可以被截断，例如在FIFO行存储器中，在被有限脉冲响应滤波器延迟和处理之前。 补偿的可变内插器可以例如通过微处理器或硬件等效来控制，以提供选定的压缩或扩展比。
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公开(公告)号：US5294987A
公开(公告)日：1994-03-15
申请号：US911648
申请日：1992-07-10
CPC分类号： H04N7/0122 , H04N3/227 , H04N3/24 , H04N5/45 , H04N5/775
摘要： A television apparatus includes a display for a video signal representing a picture. The video signal has a vertical synchronizing component defining fields of horizontal lines which can have other than a standard number of horizontal lines per field under certain operating conditions. A counter measures the number of horizontal lines in each field. A panning circuit generates a vertical reset signal which is phase shifted by a selected number of horizontal lines relative to the vertical synchronizing component of the video signal for vertically panning the picture on the video display by the selected number of horizontal lines. The selected number of horizontal lines is adjusted responsive to the measured lengths of the fields to maintain the selected amount of vertical panning even under the certain operating conditions.
摘要翻译： 电视设备包括用于表示图像的视频信号的显示器。 视频信号具有垂直同步分量，其限定在某些操作条件下每场的标准数量的水平线以外的水平线的场。 一个计数器测量每个字段中的水平行数。 平移电路产生相对于视频信号的垂直同步分量相移所选数量的水平线的垂直复位信号，用于垂直平移视频显示器上的图像所选择的数量的水平线。 响应于所测量的场长度来调整所选数量的水平线，以便即使在某些操作条件下也能保持所选择的垂直平移量。
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