Method for superimposing and detecting additional information signal, method for detecting additional information signal, device for detecting additional information signal, and device for recording information signal

An additional information detection device comprising:

• a detector for receiving an information signal;
• and
• a coincidence section coupled with said detector, wherein said detector detects an additional information signal superimposed on said information signal a plurality of times and said coincidence section outputs a signal indicating whether said plurality of times of detection of the additional information signal are coincident.

An additional information signal detection method in which an additional information signal is detected from an information signal generated by superimposing repeatedly a plurality of times said additional information signal on a main information signal, said additional information signal detection method comprising the steps of:

• detecting said additional information signal with a plurality of detections;
• and
• determining that said additional information signal is superimposed on said main information signal if said plurality of said detections of said additional information signal are coincident.

An additional information signal detection device, which detects an additional information from an information signal generated by superimposing repeatedly a plurality of times additional information on a main information signal, said additional information detection device comprising:

• detection means for detecting said additional information with a plurality of detections;
• and
• determination means for determining that said additional information is superimposed on said main information signal when said plurality of detections are coincident.

An information signal recording control device comprising:

• a detection section for receiving and processing an information signal;
• and
• a write control section coupled with said detection section, wherein said detection section detects an additional information signal superimposed on said information signal a plurality of times and outputs a signal indicating whether a plurality of detection results of the additional information signal are coincident, and whereby said write control section controls writing of said information signal in a recording medium according to said signal output from said detection section.