发明申请
- 专利标题: METHOD AND APPARATUS FOR DC RESTORATION USING FEEDBACK
- 专利标题(中): 使用反馈进行直流恢复的方法和装置
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申请号: US11309558申请日: 2006-08-22
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公开(公告)号: US20080062326A1公开(公告)日: 2008-03-13
- 发明人: Raymond William Hall , Donald E. Parreco
- 申请人: Raymond William Hall , Donald E. Parreco
- 申请人地址: US CA Anaheim
- 专利权人: RGB SYSTEMS, INC. (DBA EXTRON ELECTRONICS)
- 当前专利权人: RGB SYSTEMS, INC. (DBA EXTRON ELECTRONICS)
- 当前专利权人地址: US CA Anaheim
- 主分类号: H04N9/72
- IPC分类号: H04N9/72
摘要:
A feedback circuit for restoration of DC in video signals is presented. A sample pulse representing the back porch of an incoming video signal is generated from the horizontal sync signal. The sample pulse triggers a sample and hold circuit to acquire the correct offset voltage in the output signal during this back porch period. The offset voltage feeds back through a summing node upstream of either the circuit causing the offset or an input amplifier thereby restoring the video signal to the desired DC voltage level with respect to ground.
公开/授权文献
- US07787057B2 Method and apparatus for DC restoration using feedback 公开/授权日:2010-08-31
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