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573 条记录 (耗时 0.014 秒)

    Temperature compensated video signal processing circuit with a video signal clipping device
    71.
    发明授权
    Temperature compensated video signal processing circuit with a video signal clipping device 失效
    具有视频信号剪辑装置的温度补偿视频信号处理电路

    公开(公告)号：US3965371A

    公开(公告)日：1976-06-22

    申请号：US579702

    申请日：1975-05-21

    申请人： Itsuzo Sato ,  Kikuo Saito

    发明人： Itsuzo Sato ,  Kikuo Saito

    IPC分类号： H03F3/343 ,  H03F3/34 ,  H03K5/01 ,  H04N5/14 ,  H04N5/16 ,  H04N5/20 ,  H03K5/08

    CPC分类号： H04N5/16 ,  H03K5/01

    摘要： A temperature dependent variation of the voltage drop across a clipping pn junction device which causes the clipping voltage level of a DC restored video signal to vary is compensated by the base-to-emitter voltage variation of an emitter follower transistor having substantially the same temperature characteristic as the clipping pn junction device. A variation in the DC level of the DC restored video signal resulting from the base-to-emitter voltage variation of the emitter follower transistor is compensated by a feed back type differential amplifier whose output is fed back to one input thereof through an emitter follower transistor and a pn junction device.

    摘要翻译： 导致DC恢复的视频信号的削波电压电平变化的限幅pn结装置上的电压降的温度变化由具有基本相同温度特性的射极跟随器晶体管的基极 - 发射极电压变化补偿 作为剪切pn结装置。 由射极跟随器晶体管的基极到发射极电压变化产生的DC恢复的视频信号的直流电平的变化由反馈型差分放大器补偿，反馈型差分放大器的输出通过射极跟随器晶体管反馈到其一个输入 和pn结装置。

    Dark current correction circuit in two-tube color television camera
    72.
    发明授权
    Dark current correction circuit in two-tube color television camera 失效
    双管彩色电视摄像机中的暗电流校正电路

    公开(公告)号：US3934266A

    公开(公告)日：1976-01-20

    申请号：US536654

    申请日：1974-12-26

    申请人： Takashi Shinozaki ,  Seigo Kokufukata

    发明人： Takashi Shinozaki ,  Seigo Kokufukata

    IPC分类号： H04N5/16 ,  H01J31/46 ,  H04N9/07 ,  H04N9/09

    CPC分类号： H04N5/217 ,  H04N9/07

    摘要： A dark current correction circuit in a two-tube color camera having first and second camera tubes respectively for chrominance signals and luminance signals comprises a circuit for applying to the first camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, a circuit provided in the picked-up output signal system of the first camera tube and operating to compensate or cancel a dark current component within the picked-up output signal, a circuit for applying to the second camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, and a circuit for mixing with the picked-up output luminance signal of the second camera tube a horizontal blanking pulse at a level in accordance with the temperature variation in the image pickup surface of that camera tube. The level controlled horizontal blanking pulse, upon being applied to the picked-up output luminance signal, effects correction of a dark current variation component within the luminance signal due to temperature variation in the image pickup surface of the camera tube and for a dark current variation component due to variation of the target voltage.

    摘要翻译： 具有分别用于色度信号和亮度信号的第一和第二照相机管的双管彩色照相机中的暗电流校正电路包括用于根据其摄像表面中的温度变化向第一照相机管施加目标电压的电路， 设置在所述第一相机管的拾取输出信号系统中并且用于补偿或消除所拾取的输出信号内的暗电流分量的电路，用于根据温度向第二相机管施加目标电压的电路 其摄像表面的变化，以及与第二照相机管的拾取输出亮度信号混合的电路，其水平消隐脉冲的电平与该相机管的摄像表面的温度变化相对应。 电平控制水平消隐脉冲在被施加到拾取输出亮度信号时，由于摄像机管的图像拾取表面中的温度变化和暗电流变化而影响亮度信号内的暗电流变化分量的校正 由于目标电压的变化导致的分量。

    Peak detector and sample and hold circuit
    73.
    发明授权
    Peak detector and sample and hold circuit 失效
    峰值检测器和采样保持电路

    公开(公告)号：US3920891A

    公开(公告)日：1975-11-18

    申请号：US44639774

    申请日：1974-02-27

    申请人： GTE SYLVANIA INC

    发明人： RHEE DONG WOO

    IPC分类号： H04N5/16 ,  H04N9/72 ,  H04N3/16

    CPC分类号： H04N9/72 ,  H04N5/16

    摘要： In a signal receiver responsive to a composite video signal having pulse and video signals portion and having apparatus for providing a video signal, a peak detecting and current sampling means provides a signal representative of the peak level of the video signal and this signal is applied to a threshold detector means which holds the peak level of video signal for a time period after the peak level changes and cause operation of a switching means to effect a rapid change in the output of the peak detecting means to a new level when the given time period if expended. Thus, the video signal is employed to establish black, white, or chroma levels in a signal receiver.

    Broadband video process with very high input impedance
    74.
    发明授权
    Broadband video process with very high input impedance 失效
    宽带视频流程具有非常高的输入阻抗

    公开(公告)号：US3609230A

    公开(公告)日：1971-09-28

    申请号：US3609230D

    申请日：1968-06-24

    申请人： NASA

    发明人： WOOD JAMES W

    IPC分类号： H04N5/18 ,  H04N5/21 ,  H04N5/16 ,  H03F3/16

    CPC分类号： H04N5/21 ,  H04N5/185

    摘要： A broadband video processor is disclosed. It includes a veryhigh-input impedance stage which incorporates a field effect transistor. The processor is relatively immune to ambient noise. Also, the high impedance enables the use of a small input capacitor which accounts for fast DC restoring.

    Noise limiting circuit using switched filter
    75.
    发明授权
    Noise limiting circuit using switched filter 失效
    噪音限制电路使用切换滤波器

    公开(公告)号：US3564129A

    公开(公告)日：1971-02-16

    申请号：US3564129D

    申请日：1967-12-08

    申请人： RANK ORGANISATION LTD

    发明人： BLAXTAN PETER WILLIAM

    IPC分类号： H04N5/16 ,  H04N5/21 ,  H03G5/18 ,  H04N5/08

    CPC分类号： H04N5/16 ,  H04N5/21

    摘要： An electrical noise limiting circuit for use in an apparatus producing a composite signal including an information carrying signal of a selected bandwidth including a train of recurrent pulses. The circuit includes a switch responsive to the pulses in the composite signal, and a filter selectively connected to the apparatus by the switch. The filter reduces the level of the noise component in the composite signal at least during the periods of one or more of the pulses.