Patent ID: 6449425
Filing Date: 2002-09-10
Classification: G11B,H04N

Abstract:
An information signal output control method, comprising the steps of:detecting first and second duplication control signals of different types generated correlatively and added to an information signal to be output, wherein said first duplication control signal is attached to said information signal on an interval of a vertical retrace line erasing period, and said second duplication control signal is a wide-band low-level duplication control signal produced by processing a narrow band high-level duplication control signal and is superimposed on said information signal; and performing output control of said information signal in response to a result of said detecting of said first and second duplication control signals of different types, whereby when both of said first and second duplication control signals are detected said information signal is output, when both of said first and second duplication control signals are not detected said information signal is output, and when only one of said first and second duplication control signals is detected said information signal is not output.