Patent ID: 6345145
Filing Date: 2002-02-05
Classification: G06F,G11B,H04N

Abstract:
A signal recording method comprising:detecting a high level portion of a video signal and/or audio signal in a predetermined time interval, modifying a least significant bit of a plurality of portions of said video signal and/or said audio signal data within said predetermined time interval 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 said high level portion 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 only by sampling and detecting 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; and recording the video signal and/or the audio signal, which have been modified to include said identification, on a signal record medium.