H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18, 352/21.1
H04N 5/782 (2006.01) H04N 5/932 (2006.01)
Patent
CA 1206609
ABSTRACT: Circuit arrangement for generating the vertical synchro- nizing information in a magnetic video tape apparatus. In magnetic video-tape equipment of the helical -scan type the vertical synchronizing information is situated at the beginning of a track near the edge of the magnetic tape. When the edge portion of the magnetic tape does not cooperate correctly with the head in the case of a faulty magnetic tape or apparatus, the vertical synchro- nizing information is not scanned and the resulting pic- ture will roll in a vertical direction. However, since the beginning of a track coincides with the edges of the head-change signal, the vertical synchronizing informa- tion, in accordance with the invention, is always derived from the head-change signal, i.e. even during normal un- disturbed operation, and is added to the CVBS signal, the signal scanned from the magnetic tape being blocked dur- ing this time. For this purpose the edge of the head -change signal is delayed and this delay is controlled so that normally the generation of the vertical synchro- nizing information from the line-pulse signals which are synchronised with the preceding track starts halfway be- tween two such line-pulse signals or their active edges. Also when the permissible phase shift of the head change signal relative to the line-pulse signal upon each head change is taken into account the vertical synchronizing information always starts an equal number of half-line periods after the beginning of a track, thereby preclud- ing a vertical picture jump, not even by half a line period.
413755
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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