发明授权
- 专利标题： Circuit arrangement for distinguishing between the two fields in a television signal
- 专利标题（中）： 用于区分电视信号中的两个场的电路装置
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申请号： US800890申请日： 1985-11-22
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公开(公告)号： US4683495A公开(公告)日： 1987-07-28
- 发明人: Thorsten Brock
- 申请人： Thorsten Brock
- 申请人地址： NY New York
- 专利权人： U.S. Philips Corporation
- 当前专利权人： U.S. Philips Corporation
- 当前专利权人地址： NY New York
- 优先权： DEX3443925 19841201
- 主分类号： H04N5/10
- IPC分类号： H04N5/10 ; H04N5/04
摘要：
To distinguish between the two fields in a television signal, television synchronizing pulses are applied to a pulse interval detector. The output signal of the pulse interval detector assumes a first signal state when pulse intervals are measured which are located between first and second limit values, and a second signal state when the pulse intervals are outside these limit values. The pulse interval detector is connected to a time measuring element which counts the pulse intervals of the synchronizing pulse when the first signal state is present. The time measuring element produces a field identification signal in dependence on the fact whether, for example, the first signal state is present for a longer period of time for one field than for the other field.
公开/授权文献
- US5867524A Spread spectrum clock generator and associated method 公开/授权日：1999-02-02
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