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    Chroma processing circuitry with selectable color correction mode
    18.
    发明授权
    Chroma processing circuitry with selectable color correction mode 失效
    具有可选颜色校正模式的色谱处理电路

    公开(公告)号：US3662097A

    公开(公告)日：1972-05-09

    申请号：US3662097D

    申请日：1970-05-18

    Applicant: ZENITH RADIO CORP

    Inventor： RENNICK JOHN L

    IPC: H04N9/64 ,  H04N9/12

    CPC classification number: H04N9/643

    Abstract: Chroma processing circuitry for a color television receiver wherein nominally derived primary color signals in accordance with extracted reference information in a first selectable mode of operation may be suitably modified in a second selectable mode of operation to minimize the effect of any phase errors otherwise readily discernible as undesirable departures in fleshtone hues. The referenced modification comprises a predetermined reduction in green-purple color information relative to derived luminance and orange-cyan information. Three embodiments are disclosed. In one such embodiment employing I and Q demodulation techniques, the chroma signal as applied to the input of the included Q demodulator is selectively reduced by associated control circuitry; the signal information along the Q axis or demodulation angle representing essentially green-purple color information. In another embodiment, employing convention (R-Y) and (B-Y) color difference demodulators, the desired reduction in green-purple information is provided by suitable alteration of the respective phase delays effected in components of the reference signal selectively applied to the demodulators which in turn alters each of the demodulation angles at which such demodulators operate. In still another embodiment, appropriate modification of the final primary color signals is accomplished by selected changes in the circuit parameters of an output matrix network associated with the color difference demodulators.

    Abstract translation: 用于彩色电视接收机的色度处理电路，其中根据第一可选择操作模式中提取的参考信息的标称衍生的原色信号可以在第二可选择操作模式中被适当地修改，以最小化否则容易识别的任何相位误差的影响， 不合需要的偏离色彩。 参考的修改包括相对于导出的亮度和橙 - 青信息的绿紫色信息的预定减少。 公开了三个实施例。 在采用I和Q解调技术的一个这样的实施例中，施加到所包含的Q解调器的输入端的色度信号由相关联的控制电路选择性地减少; 沿Q轴的信号信息或基本上呈绿紫色的信息的解调角度。 在另一个实施例中，采用常规（RY）和（BY）色差解调器，通过适当改变在选择性地施加到解调器的参考信号的分量中影响的相应相位延迟的适当改变来提供期望的绿紫色信息的减少， 改变这种解调器操作的每个解调角度。 在另一个实施例中，通过对与色差解调器相关联的输出矩阵网络的电路参数的选择的改变来实现最终原色信号的适当修改。

    Matrix amplifier with gain adjusting means ineffective to alter the color of black
    19.
    发明授权
    Matrix amplifier with gain adjusting means ineffective to alter the color of black 失效
    具有增益调整功能的矩阵放大器无法改善黑色的颜色

    公开(公告)号：US3636245A

    公开(公告)日：1972-01-18

    申请号：US3636245D

    申请日：1970-08-13

    Applicant: ZENITH RADIO CORP

    Inventor： RENNICK JOHN L

    IPC: H04N9/67 ,  H04N9/50

    CPC classification number: H04N9/67

    Abstract: A solid-state matrix amplifier network is set forth and described for selectively combining three color-difference signals from a chrominance demodulator with a luminance signal to form suitable color-control drive signals for a three-gun image reproducer of a color television receiver. The matrix amplifier network includes a novel gain adjustment arrangement for obtaining correct grey scale tracking which does not interact with the controls effecting DC setup for the image reproducer nor alter the color of black established during such setup procedures.

    Abstract translation: 提出并描述了一种固态矩阵放大器网络，用于将来自色度解调器的三个色差信号与亮度信号选择性地组合，以形成用于彩色电视接收机的三枪图像再现器的合适的颜色控制驱动信号。 矩阵放大器网络包括用于获得正确的灰度跟踪的新颖的增益调整装置，其不与影响图像再现器的DC设置的控制相互作用，也不改变在这种设置过程中建立的黑色。

    Subcarrier regeneration system
    20.
    发明授权
    Subcarrier regeneration system 失效
    SUBCARRIER再生系统

    公开(公告)号：US3585285A

    公开(公告)日：1971-06-15

    申请号：US3585285D

    申请日：1968-11-21

    Applicant: ZENITH RADIO CORP

    Inventor： RENNICK JOHN L

    IPC: H03B5/36 ,  H04N9/455 ,  H04N9/46 ,  H03F3/04 ,  H03F21/00

    CPC classification number: H04N9/455 ,  H03B5/36 ,  H03B2200/0098

    Abstract: A subcarrier regeneration stage and control arrangement for a color television receiver includes a 3.58 MHz. crystal-controlled oscillator, a phase detector and a novel voltage-controllable phase shift network in the feedback loop of the oscillator for maintaining the oscillator in phase synchronism with a received NTSC reference burst signal. The phase shift network comprises a pair of transistors differentially gain-controlled by the phase detector output voltage and having their collectors coupled to respective ends of a passive phase shift circuit such that the output from one transistor is phase-advanced and the output from the other transistor is phase-retarded. The oscillator signal is concurrently applied to the emitters of the two transistors and translated through the network with a net phase shift dependent on the detector controlled gain differential between the two transistors. Also incorporated in the regeneration stage is a hue control circuit employing a second pair of transistors differentially gain-controlled by a DC control voltage from a viewer-adjustable hue control to vary the phase of the oscillator signal as applied to the demodulator. This second pair of transistors is forward biased by a control circuit during the intervals between synchronizing bursts to disable the phase detector, thereby minimizing drift and preventing the detector from responding to chrominance information signals and noise, and is back-biased during reference burst intervals to prevent translation of the oscillator output signal to the demodulator during these periods. Because the regeneration stage utilizes differentially paired transistors throughout and a minimum of inductive components, it is particularly well suited for construction in microelectronic form.

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