Video printer which switches to a field a mode upon determining

Details Video printer which switches to a field a mode upon determining Video printer which switches to a field a mode upon determining

1994-08-19

1997-05-20

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

3589091, 386 84, H04N 100, H04N 576, H04N 5225

Patent

active

056317395

ABSTRACT:
A video printer is automatically set in a field mode even when a frame mode is manually selected if an input video signal is nonstandardized. To determine whether the input video signal is standardized or not, the number of equalizing pulses generated during each vertical synchronizing period, that is, the number of cutting pulses, are checked. Also, the polarity of a field index signal is checked as to whether the polarity is inverted during each vertical synchronizing period. If the number of cutting pulses is below a predetermined value, and/or if the polarity of the field index signal is maintained unchanged, the video signal is determined nonstandardized.

REFERENCES:
patent: 5047864 (1991-09-01), Fujito
patent: 5109281 (1992-04-01), Kobori et al.

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