发明公开
EP0133190A1 Encoding and decoding of a television signal
失效
Kodierung und Dekodierung eines Fernsehsignals。
- 专利标题： Encoding and decoding of a television signal
- 专利标题（中）： Kodierung und Dekodierung eines Fernsehsignals。
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申请号： EP83304447.2申请日： 1983-08-01
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公开(公告)号： EP0133190A1公开(公告)日： 1985-02-20
- 发明人: Cheung, William Shiu Hung
- 申请人： Payview Limited
- 申请人地址： G.P.O. Box 3000 Hong Kong HK
- 专利权人： Payview Limited
- 当前专利权人： Payview Limited
- 当前专利权人地址： G.P.O. Box 3000 Hong Kong HK
- 代理机构： Cline, Roger Ledlie
- 主分类号： H04N7/16
- IPC分类号： H04N7/16
摘要：
A video signal is encoded in a pattern which changes 'rom field to field. The encoding pattern starts at the Nth line where N is a random number generated afresh for each 'ield, and thereafter alternate lines have their video portions ioninverted and inverted. Further encoding may be achieved by shifting the horizontal synchronisation pulses of certain lines starting from the Nth line and this shifting is applied to bands of lines separated by bands of lines in which the synchronisation pulse is left unchanged, in a regular pattern.
In a transmission system, the encoded video signal is combined with the encoding data and an audio signal for modulation of an rf carrier. The decoding information may be applied to a sub-carrier.
In a transmission system, the encoded video signal is combined with the encoding data and an audio signal for modulation of an rf carrier. The decoding information may be applied to a sub-carrier.
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