Scanning line position control system for shifting the position

Details Scanning line position control system for shifting the position Scanning line position control system for shifting the position

1986-07-29

1987-10-20

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358140, 358148, H04N 5262, H04N 504, H04N 701

Patent

active

047018003

ABSTRACT:
A scanning line control system shifts the timing at which a vertical synchronizing signal is generated, by h/N, to insert (N-1) scanning lines, in appearance, during one line-to-line interval for producing accurate hard copies of images displayed on a video monitor. The scanning line control system generates a signal of a frequency Nfh in synchronism with a horizontal synchronizing signal where (N-1) is the maximum number of scanning lines inserted during one line-to-line interval and fh is the frequency of the horizontal synchronizing signal. The signal of the frequency Nfh is decoded by a logic circuit in which there is preset a value corresponding to the vertical synchronizing signal as it is frequency-divided by N. The logic circuit is decoded by a train of N pulses produced by dividing the frequency Nfh synchronous with the horizontal synchronizing signal. A vertical deflection circuit is triggered by an output from the logic circuit. The vertical synchronizing signal is therefore shifted in periods of h/N with the result that a maximum of (N-1) scanning lines can be inserted, in appearance, during one line-to-line interval. A hard copy produced by photographing an image formed at a reduced line-to-line interval has a uniform contrast.

REFERENCES:
patent: 3814855 (1974-06-01), Kokado
patent: 4096530 (1978-06-01), Plugge et al.
patent: 4415931 (1983-11-01), Dischert

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