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11.发明授权Video cameras capable of switching an aspect ratio and view finders for use in the same 失效能够切换长宽比的摄像机和查看器用于同一个
公开(公告)号：US5414463A
公开(公告)日：1995-05-09
申请号：US943413
申请日：1992-09-09
申请人： Minoru Katoh , Kotaro Kawamura , Hidenobu Katayori
发明人： Minoru Katoh , Kotaro Kawamura , Hidenobu Katayori
CPC分类号： H04N7/0122 , H04N3/223 , H04N5/23293 , H04N5/772
摘要： A video camera capable of switching an aspect ratio and an electronic view finder for use in the same. In response to a switching control signal from an aspect ratio switching circuit, a video signal having a different degree of horizontal compression and an aspect switching control signal are fed to the view finder, a magnetic recording/reproducing circuit and an external device. The magnetic recording/reproducing circuit simultaneously records the video signal and the switching control signal. In reproduction, the magnetic recording/reproducing circuit reproduces and outputs the recorded switching control signal. In response to the switching control signal, the external device changes the deflection angle of a built-in display circuit and switches the aspect ratio to display the video signal. The electronic view finder receives a video signal having a different horizontal compression degree, and at the same time receives the aspect ratio switching control signal to operate the switching circuit in the view finder to change the deflection angle and hence switch the aspect ratio to display the image.
摘要翻译： 能够切换长宽比的摄像机和用于其的电子取景器。 响应于来自宽高比切换电路的切换控制信号，具有不同程度的水平压缩和方面切换控制信号的视频信号被馈送到取景器，磁记录/再现电路和外部设备。 磁记录/再现电路同时记录视频信号和切换控制信号。 在再现中，磁记录/再现电路再现并输出记录的切换控制信号。 响应于开关控制信号，外部装置改变内置显示电路的偏转角度并切换宽高比以显示视频信号。 电子取景器接收具有不同水平压缩程度的视频信号，并且同时接收宽高比切换控制信号以操作取景器中的切换电路以改变偏转角度，因此切换宽高比以显示 图片。
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公开(公告)号：US5374963A
公开(公告)日：1994-12-20
申请号：US940904
申请日：1992-10-28
申请人： Donald H. Willis
发明人： Donald H. Willis
CPC分类号： H04N7/0122 , G06T3/40 , H04N3/223 , H04N3/27 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N9/641
摘要： A dithering technique in accordance with an inventive arrangement saves two bits per sample in a wideband video signal. In accordance with this arrangement, a dither signal is added to an n-bit video signal. The adder should include a limiter to avoid overflows. The samples are truncated after the addition. In truncation, the least significant two bits are simply discarded. Usually, dither values are small positive integers which tend to increase the DC content of the signal. A dither signal which can provide significant improvement in a subsampled signal is a two frequency dither in which the higher frequency has the higher amplitude. The dither signal can have any repetitive sequence of the numbers 0, 1, 2, 3 in any order within said sequence, for example, 0, 2, 1, 3, 0, 2, 1, 3, . . . , etc. The quarter-frequency component is usually more objectionable than the half-frequency component, even though the quarter-frequency component has half the amplitude of the half-frequency component. Accordingly, a dedithering scheme can be chosen to suppress only the quarter-frequency component. A first signal path of the dedithering circuit is for delay and amplitude matching. A second signal path includes a combination inverted bandpass filter and limiter. The inverted bandpass filter cancels the frequency at the center of the passband when added to the delay and amplitude matched original signal. The limiter assures that only amplitudes of dither size will be cancelled.
摘要翻译： PCT No.PCT / US91 / 03743 Sec。 371日期：1992年10月28日 102（e）1992年10月28日的PCT日期1991年5月29日提交。根据本发明的装置的抖动技术在宽带视频信号中保存每个样本两个比特。 根据这种配置，将抖动信号加到n位视频信号上。 加法器应包括一个限制器以避免溢出。 样品在加入后被截断。 在截断中，最低有效的两位被简单地丢弃。 通常，抖动值是小的正整数，倾向于增加信号的直流含量。 可以在二次采样信号中提供显着改进的抖动信号是其中较高频率具有较高振幅的两次频率抖动。 抖动信号可以在所述序列内以任何顺序具有数字0,1,2,3的任何重复序列，例如0,2,1,3,0,2,1,3。 。 。 等等。四分之一频率分量通常比半频分量更令人反感，即使四分之一频率分量具有半频分量幅度的一半。 因此，可以选择去抖动方案来仅抑制四分之一频率分量。 去噪电路的第一个信号路径用于延迟和幅度匹配。 第二信号路径包括组合反相带通滤波器和限制器。 反相带通滤波器在加到延迟和幅度匹配的原始信号时取消通带中心的频率。 限幅器确保仅抖动大小的幅度将被取消。
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公开(公告)号：US5351135A
公开(公告)日：1994-09-27
申请号：US57026
申请日：1993-05-05
申请人： Timothy W. Saeger
发明人： Timothy W. Saeger
IPC分类号： H04N5/46 , H04N3/223 , H04N3/27 , H04N5/445 , H04N5/45 , H04N7/00 , H04N7/01 , H04N9/64 , H04N9/79 , H04N21/488 , H04N7/04 , H04N5/278 , H04N7/08
CPC分类号： H04N21/4884 , H04N3/223 , H04N3/27 , H04N5/44513 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N7/0122 , H04N9/641 , H04N9/7925 , 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, the letterbox format pictures sometimes having auxiliary information disposed in a border area; and, a circuit for preventing the letterbox detector from sampling the video information in any portion of the border area in which the auxiliary information can be expected to be disposed, when present. In the case of logos, which are generally disposed near or at the right side of the lower border, a horizontal sampling range will exclude the right side of each horizontal line.
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; 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的信箱检测器，并且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，信箱格式图片有时具有布置在边界中的辅助信息 区; 以及用于防止信箱检测器在存在可预期辅助信息的边界区域的任何部分中对视频信息进行采样的电路。 在通常设置在下边界附近或右侧的标志的情况下，水平采样范围将排除每条水平线的右侧。
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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：US5289284A
公开(公告)日：1994-02-22
申请号：US691031
申请日：1992-11-12
IPC分类号： H04N5/46 , G06F3/00 , G06T3/40 , G09G5/00 , G09G5/14 , G09G5/377 , G09G5/391 , H04N3/223 , H04N3/227 , H04N3/27 , H04N5/073 , H04N5/14 , H04N5/262 , H04N5/265 , H04N5/44 , H04N5/45 , H04N7/00 , H04N7/01 , H04N7/015 , H04N7/26 , H04N9/64 , H04N11/06 , H04N11/20 , H04N11/24 , H04N5/272
CPC分类号： H04N9/641 , G06T3/0012 , G06T3/4007 , H04N19/90 , H04N3/223 , H04N3/227 , H04N3/27 , H04N5/2624 , H04N5/45 , H04N7/007 , H04N7/01 , H04N7/0105 , H04N7/0122 , H04N7/015 , H04N9/64
摘要： A line memory and control system comprises a line memory, for example a first in first out (FIFO) device. A comparator compares a first value, specifying a location in the horizontal line period where reading or writing of the line memory is to begin, with a second value, fixing pixel location within each line period. A register stores the number of data samples stored in the line memory. A counter counts the number of data samples which have actually been written into the line memory or read from the line memory. The counter has an output of the comparator as a first input and the number of data samples previously stored in the line memory as a second input. In the case of both compression and expansion, a line memory control system assures that the number of samples written into each FIFO line memory be the same as the number of samples read out of each FIFO line memory.
摘要翻译： PCT No.PCT / US91 / 03810 Sec。 371日期：1992年11月12日 102（e）1992年11月12日的PCT日期1991年5月30日提交。一种线路存储器和控制系统包括行存储器，例如先进先出（FIFO）装置。 一个比较器比较一个第一个值，用于指定在行存储器的开始读取或写入的水平行周期中的位置与第二个值，固定每个行周期内的像素位置。 寄存器存储存储在行存储器中的数据样本的数量。 一个计数器计数实际上被写入行存储器或从行存储器中读取的数据样本的数量。 计数器具有作为第一输入的比较器的输出和先前存储在行存储器中的数据样本的数量作为第二输入。 在压缩和扩展的情况下，行存储器控制系统确保写入每个FIFO行存储器的样本数量与从每个FIFO行存储器读出的样本数相同。
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公开(公告)号：US5250879A
公开(公告)日：1993-10-05
申请号：US958594
申请日：1992-10-08
申请人： Kark R. Koblitz
发明人： Kark R. Koblitz
摘要： In a vertical sawtooth generator of a vertical deflection circuit, a first comparator generates an output signal when a retrace portion of a sawtooth signal is at a first magnitude to initiate a vertical trace portion of the sawtooth signal. An amplifier responsive to the sawtooth signal generates a feedback current at a time that occurs more than one-half of the length of vertical trace portion after vertical trace is initiated. The feedback current is coupled to a capacitor to develop a capacitor voltage. The capacitor voltage is applied via a voltage-to-current converter to an integrating capacitor to develop in the integrating capacitor the trace portion of the sawtooth signal.
摘要翻译： 在垂直偏转电路的垂直锯齿波发生器中，当锯齿波信号的回扫部分处于第一幅度时，第一比较器产生输出信号以启动锯齿波信号的垂直轨迹部分。 响应于锯齿波信号的放大器在垂直迹线起始之后的时间内产生大于垂直迹线部分的长度的一半的时间的反馈电流。 反馈电流耦合到电容器以产生电容器电压。 电容器电压通过电压 - 电流转换器施加到积分电容器，以在积分电容器中产生锯齿波信号的迹线部分。
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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：US4679211A
公开(公告)日：1987-07-07
申请号：US749518
申请日：1985-06-27
申请人： Walter Kurz
发明人： Walter Kurz
CPC分类号： H04N3/223
摘要： The output voltage of a variable output voltage power supply is supplied to the deflection system of a raster scanned CRT and is controlled by a frequency responsive control signal generator so as to maintain peak to peak deflection current substantially constant despite scanning frequency variations. Picture width and/or height may be controlled in this way.
摘要翻译： 可变输出电压电源的输出电压被提供给光栅扫描CRT的偏转系统，并且由频率响应控制信号发生器控制，以便尽管扫描频率变化仍保持峰 - 峰偏转电流基本恒定。 图像宽度和/或高度可以以这种方式进行控制。
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公开(公告)号：US4572993A
公开(公告)日：1986-02-25
申请号：US651316
申请日：1984-09-17
申请人： Peter E. Haferl
发明人： Peter E. Haferl
CPC分类号： H04N3/223
摘要： An energizing voltage is series coupled with a diode, an inductor, a flyback transformer primary winding and an input terminal of a deflection circuit. During trace, the diode is forward biased causing a voltage to be developed across and an input current to flow in the inductor. During retrace, opposite polarity retrace voltage commutates off the diode and decouples the input terminal from the energizing voltage at a varied instant within retrace, in accordance with the amplitude of the input current. The amplitude of the input current is related to the ultor load current. A voltage that is indicative of the input current is developed across a capacitor. A DC voltage between one plate of the capacitor and a reference conductor controls the deflection current in the deflection winding such that variations in the ultor voltage produce the same sense variations in the DC voltage that is supplied by the capacitor for maintaining a substantially constant raster width.
摘要翻译： 激励电压与二极管，电感器，回扫变压器初级绕组和偏转电路的输入端串联耦合。 在跟踪期间，二极管被正向偏置，导致跨越电压并且输入电流在电感器中流动。 在回扫期间，相反的极性回扫电压根据输入电流的幅度将二极管整流并在回扫期间在变化的瞬间将输入端与激励电压分离。 输入电流的幅度与阳极负载电流有关。 在电容器上形成表示输入电流的电压。 电容器的一个板和参考导体之间的直流电压控制偏转绕组中的偏转电流，使得阳极电压的变化产生由电容器提供的用于维持基本上恒定的光栅宽度的直流电压相同的感测变化 。
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公开(公告)号：US4318036A
公开(公告)日：1982-03-02
申请号：US205819
申请日：1980-11-10
申请人： Stan Bart , Gopal K. Srivastava
发明人： Stan Bart , Gopal K. Srivastava
CPC分类号： H04N3/223
摘要： A pulse width modulator is described for width-modulating horizontal rate pulses developed in a television receiver and for applying the width-modulated pulses to the receiver's horizontal drive system. In the illustrated embodiment, the modulator includes a differential amplifier which senses the receiver's high voltage and beam current to develop a control signal which varies in accordance with variations in the beam current and the high voltage. A second differential amplifier receives the control signal and horizontal rate pulses for developing pulses whose width is varied in response to variations in the control signal. The width-modulated pulses cause the horizontal drive system to generate a substantially constant horizontal picture size despite variations in line voltage and brightness.
摘要翻译： 描述了用于在电视接收机中产生的宽度调制水平速率脉冲并且将宽度调制脉冲施加到接收机的水平驱动系统的脉冲宽度调制器。 在所示实施例中，调制器包括差分放大器，其感测接收机的高电压和波束电流，以产生根据波束电流和高电压的变化而变化的控制信号。 第二差分放大器接收用于显影脉冲的控制信号和水平速率脉冲，其宽度响应于控制信号的变化而变化。 尽管线路电压和亮度有变化，但宽度调制脉冲使得水平驱动系统产生基本上恒定的水平图像尺寸。
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