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    • 35. 发明授权
    • Composite video color signal generation from digital color signals
    • 从数字彩色信号生成复合视频彩色信号
    • US4442428A
    • 1984-04-10
    • US292074
    • 1981-08-12
    • Mark E. DeanDavid A. KummerJesus A. Saenz
    • Mark E. DeanDavid A. KummerJesus A. Saenz
    • H04N11/20G09G1/28G09G5/04H04N9/04H04N9/077
    • G09G1/285
    • A 3.58 MHz subcarrier signal and a 14.318 MHz clock signal are applied to three flipflops (50, 52 and 54) in such a manner that there appears on the output terminals (Q and Q) of the latches individual phase-shifted subcarriers having relative phases of 0.degree., 180.degree., 90.degree., 270.degree., 135.degree. and 315.degree. , respectively, representing the colors yellow, blue, red, cyan, magenta and green, respectively. Computer-generated digital color signals (+BLUE, +GREEN, +RED) are applied to the switching inputs (A, B, C) of a multiplexer (56) in order selectively to switch to the output of the multiplexer individual ones of the phase-shifted subcarriers in accordance with the code represented by the digital color signals. The individual subcarriers are combined in a summing circuit (62, 64) with television synchronizing and blanking pulses to produce a composite video color signal which is directly compatible with a conventional composite monitor and, after R.F. modulation, with a conventional television receiver. Brighter versions of the colors are obtained by increasing the direct current level (+INTENSITY) at the summing circuit.
    • 一个3.58MHz的子载波信号和一个14.318MHz的时钟信号以这样一种方式施加到三个触发器(50,52和54)上,使得存在锁存器的输出端子(Q和& upbar&Q),各个相移子载波具有相对的 分别为0°,180°±20°,90°,270°,135°和315°的相,分别表示黄色,蓝色,红色,青色,品红色和绿色的颜色。 计算机生成的数字彩色信号(+ BLUE,+ GREEN,+ RED)被施加到多路复用器(56)的切换输入(A,B,C),以便有选择地切换到复用器的输出 根据由数字彩色信号表示的码相移子载波。 各个子载波在加法电路(62,64)中与电视同步和消隐脉冲组合以产生与常规复合监视器直接兼容的复合视频彩色信号,并且在R.F.之后。 用传统的电视接收机进行调制。 通过增加求和电路上的直流电平(+ INTENSITY)获得更明亮的颜色。