| 摘要 |
PROBLEM TO BE SOLVED: To identify whether a signal recorded in a signal recording medium is an original signal or a copied one, by recording in a medium a video signal and/or an acoustic signal into which an identification signal is inserted. SOLUTION: A video signal inputted to a terminal 1 is inputted to an addition circuit 3 via an A/D converter 2, and an identification signal is added to the least significant bit of the luminance signal of the digital video signal inputted from the terminal 28. The signal is provided with compression encoding in a compression encoding circuit 4 according to MPEG 2 Standard and is sectored in a sector circuit 5, which adds an error detection sign to the signal. After a header is added to the signal in an addition circuit 6, a parity bit is added to the signal in a encoding circuit 7, and the signal is then converted into modulated data of 16-channel bit in a modulation circuit 8, and a synchronizing signal of an out-of-rule pattern is added in an addition circuit 9 and the signal is recorded in an optical disk 12 with a recording/reproducing head 14. |
