Patent ID: 6704490
Filing Date: 2004-03-09
Classification: G11B,H04N

Abstract:
An information recorder/reproducer which records video signals having the number N of tracks corresponding to a broadcasting system for each basic unit of video signals and corresponding to the broadcasting system and control signals corresponding to each of said tracks on a magnetic tape and which reproduces these signals, comprising:a capstan for transferring said magnetic tape in a am longitudinal direction thereof; an FG signal generation unit for outputting FG signals proportional to a number of revolutions of said capstan; a fixed head for recording and reproducing said control signals which correspond to each of said tracks in the positions along said longitudinal direction of said magnetic tape; a recording control signal generation unit for generating control signals which correspond to each track and of which the duties differ for every N tracks and which are outputted to said fixed head; a waveform formation block for generating control signals at the time of recording based on the signals reproduced by said fixed head; a CTL signal duty ratio determination unit for detecting a duty ratio of a positive polarity to negative polarity section to a negative polarity to positive polarity section in one period of said control signals, from the control signals outputted from said waveform formation block, and from FG signals of said FG signal generation unit; a CTL signal counting unit for counting the number of outputs of said control signals obtained by said waveform formation block; and a broadcasting system determination unit for determining the broadcasting system of the video signals recorded on said magnetic tape based on the output of said CTL signal duty ratio determination unit and the output of said CTL signal counting unit.