| 摘要 |
PCT No. PCT/GB82/00030 Sec. 371 Date Oct. 5, 1982 Sec. 102(e) Date Oct. 5, 1982 PCT Filed Feb. 5, 1982 PCT Pub. No. WO82/02810 PCT Pub. Date Aug. 19, 1982.The present invention relates to digital television tape recording and more particularly to such recording using helical scan apparatus of the segmented type i.e. where one field of video is recorded by a plurality of rotations of the headwheel. The invention also provides apparatus for recording or playing back a digital television signal comprising a helical scanning device including a drum which may be a rotatable headwheel provided with a plurality of recording/playback heads, guide means for wrapping a magnetic recording tape around a portion of the circumference of the drum, means for rotating the headwheel, and means for moving the tape around the surface of the drum whereby one field of a television video picture is recorded or played back by a plurality of rotations of the headwheel, characterized in that the recording/playback heads are disposed on the headwheel.
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