发明公开
- 专利标题: Television receiver having skew corrected clock
- 专利标题(中): 电视接收器带有修正时钟
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申请号: EP93200689.3申请日: 1988-03-28
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公开(公告)号: EP0550420A3公开(公告)日: 1993-08-18
- 发明人: Romesburg, Eric Douglas , Fling, Russell Thomas
- 申请人: RCA Thomson Licensing Corporation
- 申请人地址: 2 Independence Way Princeton New Jersey 08540 US
- 专利权人: RCA Thomson Licensing Corporation
- 当前专利权人: RCA Thomson Licensing Corporation
- 当前专利权人地址: 2 Independence Way Princeton New Jersey 08540 US
- 代理机构: Ahrens, Thomas
- 优先权: US32258 19870331; US32261 19870331
- 主分类号: H04N5/12
- IPC分类号: H04N5/12
摘要:
A digital TV receiver includes an apparatus for generating a skew corrected clock. The apparatus consists of a fixed frequency, free running oscillator (22) for producing a signal (FFOS) having a frequency which is a fixed integer multiple K of the desired nominal frequency of the skew-corrected clock signal, and a divide-by-K circuit (30) which is reset once every horizontal line. The divide-by-K circuit comprises a divide-by-m circuit connected in series with a flip-flop (50), with said divide-by-m circuit (40) being reset by a first control signal (FCS) once every horizontal line. The apparatus additionally includes means (Fig. 2/SCS) for preventing the output of the flip-flop (50) from changing while the divide-by-m circuit is reset in response to the first control signal (FCS). In accordance with another aspect of this invention, the state of the divide-by-K circuit (30) is captured (150/SES) and saved for use in a chroma demodulation apparatus (Fig. 6) just before it is reset.
公开/授权文献
- EP0550420B1 Television receiver having skew corrected clock 公开/授权日:1999-10-27
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