发明公开
- 专利标题： 50 HZ Parabolic signal filter
- 专利标题（中）： 筛选抛物线50HZ的信号。
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申请号： EP95102654.1申请日： 1995-02-24
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公开(公告)号： EP0671847A1公开(公告)日： 1995-09-13
- 发明人: Helfrich, Kenneth Jay
- 申请人： THOMSON CONSUMER ELECTRONICS, INC.
- 申请人地址： 10330 North Meridian St. Indianapolis, IN 46206 US
- 专利权人： THOMSON CONSUMER ELECTRONICS, INC.
- 当前专利权人： THOMSON CONSUMER ELECTRONICS, INC.
- 当前专利权人地址： 10330 North Meridian St. Indianapolis, IN 46206 US
- 代理机构： Wördemann, Hermes, Dipl.-Ing.
- 优先权： US207915 19940308
- 主分类号： H04N3/27
- IPC分类号： H04N3/27 ; H04N3/233
摘要：
A scanning waveform generator for operation at a first or a second scanning frequency comprises a source (IC100) of a parabolic shaped signal having a frequency selectable between the first or second scanning frequency. A means (456) for generating a switching signal indicative of a video signal operating at one of a first or a second scanning frequency. A means (CS50, CS60 C4, C5, 460) for generating a sawtooth shaped waveform is coupled to the switching signal for switching between the first or the second scanning frequency. A means (U1, R6) for generating an S correction signal is coupled to the source (IC100) and to the sawtooth generating means (CS50, CS60 C4, C5, 460). A means (R1, C1, Q1) for filtering the parabolic signal is controllably coupled to the switching signal generator(456), and is also coupled to the S correction signal generating means (U1, R6). The filtered parabolic signal has an substantially the same shape during the first or second scanning frequency.
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