Quasi-vertical synchronizing signal generator

Details Quasi-vertical synchronizing signal generator Quasi-vertical synchronizing signal generator

1979-04-05

1981-03-17

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Record editing

360 36, 360 37, 360 77, 360 78, H04N 578

Patent

active

042570735

ABSTRACT:
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 accordance 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. 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.

REFERENCES:
patent: 3869709 (1975-03-01), Yamagishi et al.
patent: 4133009 (1979-01-01), Kittler et al.
patent: 4139867 (1979-02-01), Foerster
patent: 4167762 (1979-09-01), Hashizaki et al.
patent: 4203138 (1980-05-01), Elenbaas
"Schaltbeispiele"-Siemens, 1976/77, pp. 48-51.

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