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    • 21. 发明专利
    • MAGNETIC PICTURE RECORDING DEVICE
    • JPS55108909A
    • 1980-08-21
    • JP1533079
    • 1979-02-13
    • OLYMPUS OPTICAL CO
    • KIMURA KENJI
    • H04N5/92G11B20/02H04N5/919H04N5/95
    • PURPOSE:To generate automatically proper sampling signals required for Hadamard reverse conversion at a reproducing time by recording a time base correction signal synchronously with the sampling signal for Hadamard conversion together with video signals divided for plural channels. CONSTITUTION:The horizontal synchronizing signal is separated by synchronizing separator 3. Video signals are sampled with integral multiple frequencies of the frequency of the horizontal synchronizing signal through saw tooth wave generation circuit 4, phase shifter 5 and ring counter 6 synchronously with the horizontal synchronizing signal. Video signal subjected to Hadamard conversion through Hadamard conversion circuit 8, mixers 91..., FM modulators 111..., etc., and the time base correction signal synchronous with them are recorded by heads 151.... Simultaneously, the time base correction signal and the Hadamard conversion sampling signal are recorded by head 16, and at a reproducing time, phase distortion based on jitter, etc., is absorbed by time base correctors 191... and 20, and sampling for Hadamard reverse conversion is controlled to the same phase as the time base correction signal synchronous with the Hadamard conversion sampling signal.