G - Physics – 11 – B
Patent
G - Physics
11
B
352/10.41
G11B 15/18 (2006.01) G11B 27/029 (2006.01) G11B 27/024 (2006.01)
Patent
CA 1265237
ABSTRACT OF THE DISCLOSURE A helical scan type video tape recorder (VTR) having an editing function mode in which a new video signal can be inserted between a cut-in point and cut-out point on a previously recorded video tape. The VTR comprises a rotary head drum; a rotary video head secured to the rotary head drum for recording video signals on the video tape in a plurality of skewed video tracks; a recording control circuit for supplying a recording current of the new video signal to the video head in response to a recording command signal; a rotary erase head secured to the rotary head drum for erasing a video signal recorded on selected ones of the video tracks, the rotary erase head being positioned to scan the tracks ahead of the video head by a predetermined interval; and an erasing control circuit for supplying an erasing current, in response to the recording command signal, to the rotary erase head during the editing interval of the editing function mode except for at least one or two intervals in which the rotary erase head traces tracks at the cut-in point and the cut-out point so that the erasing current does not leak to the adjacent track in advance of the cut-in point and to the adjacent track following the cut-out point. Consequently, a fringe effect caused by the operation of the erase head is prevented from affecting other tracks outside the cut-in and cut-out point tracks.
522010
Murakami Mituaki
Ohgawara Yoshiaki
Gowling Lafleur Henderson Llp
Sony Corporation
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