H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18.4
H04N 5/782 (2006.01) G11B 5/588 (2006.01) H04N 5/932 (2006.01)
Patent
CA 1134505
S01171 QUASI-VERTICAL SYNCHRONIZING SIGNAL GENERATOR ABSTRACT OF THE DISCLOSURE A quasi-vertical synchronizing signal generator is disclosed, for use with a helical scan video tape recorder (VTR) to generate a quasi-vertical synchronizing signal during a special video effects reproducing operation, which signal occurs at the same relative location during the scanning trace of the reproducing head even if the effective length of that trace varies in accord- ance with the special video effects then in operation. A signal is produced when the head reaches a pre-established location in the track which it is scanning, and then a delayed signal, which is delayed from the time that the head reached the pre-established location, is generated, this delayed time being selectable as a function of the particular special video effect which has been selected for operation. The delayed signal constitutes the quasi- vertical synchronizing signal. In one embodiment, the actual vertical synchronizing signal is recorded in each track that is scanned by the head, and the signal which is produced when the head reaches a pre-established location is the reproduced vertical synchronizing signal. If the selected special video effect results in a longer-than-normal effective length of the scanning trace, then the quasi-vertical synchronizing signal is produced with a greater delay than if the selected special video effect results in a scanning trace of smaller-than-normal effective length. In accordance with another embodiment, the signal which is produced when the head reaches its pre-established location is generated by counting the number of horizontal synchronizing signals which are reproduced during the scanning trace, and when a predetermined -i- number has been counted, the location-representing signal is produced. If the effective length of the scanning trace is greater-than-normal, this predetermined number is higher than if the length of the scanning trace is less-than-normal. -ii-
324934
Gowling Lafleur Henderson Llp
Sony Corporation
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