Patent ID: 6363209
Filing Date: 2002-03-26
Classification: G06F,G11B,H04N

Abstract:
A signal record medium having recorded thereon a video signal and/or an audio signal of which a least significant bit of a plurality of portions of said video signal, and/or said audio signal has been modified to include an identification relevant to said video signal and/or said audio signal within a portion of said video signal and/or said audio signal including, or in the vicinity of, a determined high level portion thereof within a predetermined time interval, and in a configuration so as to reduce the effects of the inclusion of said identification on said video signal and/or said audio signal, and wherein said identification is detected by an apparatus that separates said identification from said video signal and/or said audio signal by sampling all of the least significant bits of all of the video signal and/or audio signal in said predetermined time interval and processing all of said detected least significant bits.