| 摘要 |
A summing section adds, by summing process, additional information corresponding to the least significant bit of the digital video signal S1 to the digital video signal S1 and records the video signal S2 to which the additional information is added to a recording medium with a writing section. When the video signal, being recorded on a recording medium, to which the additional information is added is duplicated to the other recording medium, the additional information is extracted for utilization by subtracting the original video signal to which the additional information is not added from the duplicated video signal to which the additional information is added.
|
