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GAIN-CONTROLLED LUMINANCE COMPENSATION

机译:增益控制的亮度补偿

摘要

In apparatus for reproducing a video signal which is recorded on a recording medium with a luminance component thereof non-linearly pre-emphasized and the signal portions thereof greater than a predetermined level being clipped; there are provided a non-linear de-emphasizing circuit which non-linearly attenuates the reproduced luminance component in a manner substantially complementary to the amount of the non-linear pre-emphasis, a gain control element, for example, in the form of a transistor, having a variable gain, and a compensating circuit for substantially recovering the clipped signal portions upon reproduction of the video signal, and in which the compensating circuit increases the gain of the gain control element for the portions of the reproduced luminance component at the predetermined level. The compensating circuit desirably includes a switching diode connected at one terminal to the collector of the gain control transistor and to a reference voltage at the other terminal such that the diode is made conductive for the portions of the reproduced luminance component of the video signal at the predetermined level to increase the gain of the transistor at the collector thereof.
机译:在用于再现视频信号的设备中,该视频信号以非线性地预加重其亮度分量并且大于预定电平的信号部分被削波而记录在记录介质上;提供了一种非线性去加重电路,其以与非线性预加重的量基本互补的方式非线性地衰减所再现的亮度分量,例如,增益控制元件为具有可变增益的晶体管,和补偿电路,用于在视频信号的再现时基本恢复削波的信号部分,并且其中补偿电路针对预定亮度的再现亮度分量的部分增加增益控制元件的增益。水平。补偿电路最好包括一个开关二极管,该开关二极管的一端连接到增益控制晶体管的集电极,另一端连接到参考电压,从而使该二极管对于视频信号的再现亮度分量的一部分导电。预定电平以增加其集电极处的晶体管的增益。

著录项

  • 公开/公告号AU4657279A

    专利类型

  • 公开/公告日1979-11-29

    原文格式PDF

  • 申请/专利权人 SONY CORPORATION;

    申请/专利号AU19790046572

  • 发明设计人 KAZUO YAMAGIWA;YUKOHIKO MACHIDA;

    申请日1979-05-01

  • 分类号H04N9/539;H03G7/06;

  • 国家 AU

  • 入库时间 2022-08-22 18:02:00

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