首页>
外国专利>
Black level control for video signal - has blanking signal applied to base and composite video signal to emitter of transistor switch
Black level control for video signal - has blanking signal applied to base and composite video signal to emitter of transistor switch
展开▼
机译：视频信号的黑电平控制-将消隐信号应用于基极，将复合视频信号应用于晶体管开关的发射极
展开▼
页面导航
摘要
著录项
相似文献
摘要
The black level control has a capacitor (2) transferring the video signal (picture + blanking) signal) to a transistor emiter. A blanking signal (A) is applied to the transistor's base and turns it off during the blanking period. The blanking signal is likewide applied via a capacitor (7) to the transistor base. The transistor base is connected via a diode (8) to a constant potential (9) to set the black level voltage in the video signal. A trigger (4) is connected to the transistor emitter on the output side in order to remove signal levels below the set black level voltage (UK) in the video signal. The advantage lies in few components and incorrecting the unwanted dark current component in the video signal.
展开▼
