| 摘要 |
A DIGITAL RECORDING AND PLAYBACK UNIT WHICH PREVENTS DETERIORATION OF REPRODUCED VIDEO IMAGE DUE TO CONFUSION IN SERVO CONTROL OCCURRING AT A CHRONOLOGICALLY DISCONTINUED PORTION IN THE RECORDING AT THE TIME OF PLAYBACK WHEN A WIDE HEAD IS USED FOR REPRODUCING ASSEMBLED VIDEO DATA RECORDED IN A NARROW TRACK WIDTH. THE DIGITAL RECORDING AND PLAYBACK UNIT INCLUDE A DECODING CIRCUIT (5) FOR DECODING THE REPRODUCING SIGNAL TO DIGITAL PLAYBACK DATA, AN ERROR CORRECTION CIRCUIT (106) FOR RESTORING ERRONEOUS PORTIONS OF THE DATA DECODED BY THE DECODING CIRCUIT (5), A FIRST FRAME MEMORY (9) USED FOR MAKING CORRECTIONS BY THE ERROR CORRECTION CIRCUIT (106), A DESHUFFLING CIRCUIT (108) FOR REASSEMBLING DATA RESTORED BY THE ERROR CORRECTION CIRCUIT (106), A SECOND FRAME MEMORY (10) USED FOR DESHUFFLING BY THE DESHUFFLING CIRCUIT (108), A DETECTING CIRCUIT (LL)FOR DETECTING A CHRONOLOGICALLY DISCONTINUED PORTION IN THE RECORDING AT THE TIME OF PLAYBACK, AND A CONTROL CIRCUIT (12) FOR INSTRUCTING WRITING AND READING TO AND FROM THE FIRST AND SECOND FRAME MEMORIES BASED ON THE OUTPUT OF THE DETECTING CIRCUIT (11). HELICAL SCANNING IS EMPLOYED AND ONE FRAME OF THE VIDEO IMAGE CONSISTING OF MULTIPLE TRACKS IS RECORDED IN A TRACK WIDTH OF 2 W/3, WHERE W IS THE WIDTH OF A RECORDING AND PLAYBACK HEAD.FIGURE 2
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