Video copy protection

专利名称：Video copy protection

发明人：Kori, Teruhiko Sony Corp. Intel. Prop. Dept.申请号：EP97302523.2申请日：19970414公开号：EP0802676A3公开日：19980128

专利附图：

摘要：Regular burst signals from video line (n+0) to line (n+3) are replaced bymodified burst signals which function as copy prohibit signals. The phase of the modifiedburst signals is controlled by controlling at least one of the orthogonal vectors intowhich the phase of the regular burst signal is resolved, and the phase vector of the

modified burst signals is equal to the average value of the phase vector of the regularburst signals in lines (n+0) through (n+3). The phase vector of the modified burst signal inline (n+2) exhibits a phase difference of 135° from the phase vector of the original regularburst signal in that line and causes image disturbances when the thus-modified videosignal is recorded and reproduced by a VCR. The phase vector of the modified burstsignal in each of lines (n+0), (n+1) and (n+3) exhibits a difference as small as 45° from thephase vector of the original regular burst signal in those lines.

申请人：SONY CORPORATION

地址：6-7-35 Kitashinagawa Shinagawa-ku Tokyo 141 JP

国籍：JP

代理机构：Turner, James Arthur

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