发明授权
US07705917B2 Method and circuit for extracting synchronization signals in a video signal
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用于提取视频信号中的同步信号的方法和电路
- 专利标题: Method and circuit for extracting synchronization signals in a video signal
- 专利标题(中): 用于提取视频信号中的同步信号的方法和电路
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申请号: US10518828申请日: 2003-06-23
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公开(公告)号: US07705917B2公开(公告)日: 2010-04-27
- 发明人: Philippe Belin , Nicolas Guillerm
- 申请人: Philippe Belin , Nicolas Guillerm
- 申请人地址: NL Eindhoven
- 专利权人: NXP B.V.
- 当前专利权人: NXP B.V.
- 当前专利权人地址: NL Eindhoven
- 优先权: FR0208132 20020628
- 国际申请: PCT/IB03/02887 WO 20030623
- 国际公布: WO2004/004317 WO 20040108
- 主分类号: H04N5/10
- IPC分类号: H04N5/10
摘要:
The invention relates a method of extracting synchronization signals from an input video signal (Csync) comprising horizontal synchronization pulses at the start of video lines, for generating a horizontal synchronization signal (Hsync), said method comprising:—a calculation step (105) for calculating the duration (D) of the video lines in said input video signal (Csync),—a forcing step (108) for forcing said input video signal (Csync) to an output level, said output level corresponding to the level of said input video signal (Csync) after the horizontal synchronization pulses, said input signal (Csync) being forced between the end of each horizontal synchronization pulse and a moment defined by a first percentage (X1) of said line duration (D), for generating said horizontal synchronization signal (Hsync). Use: Extraction of synchronization signals.
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