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VIDEO_DC_RESTORER

2016-09-10 02:16  
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VIDEO_DC_RESTORER
The main requirement for efficient dc restoration is to provide a short time-constant during the clamp period,with a long time-constant during the active line time.The switch within the Harris HI201HS has anon resistance of 30 Ω and the PMI buffer, BUF03,has an input resistance of 50 MΩ.The tuned circuit presents a high impedance at the 4.43-MHz color subcarrier frequency SO that the color-burst signal is retained if the video signal contains this information,