Alpha-numeric-display system with selectable crawl

Details Alpha-numeric-display system with selectable crawl Alpha-numeric-display system with selectable crawl

1980-03-10

1982-03-16

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340731, 178 30, G09G 116

Patent

active

043203957

ABSTRACT:
A television-type system for displaying characters of an alpha-numeric test n a horizontal line moving across the face of a TV monitor includes pulse-generator-fed frequency dividers emitting pulse sequences of which three are transmitted via viewer-operated selectors for forming two frequencies f.sub.L and f.sub.Z applied to shift registers of a character generator to determine character height and width and another frequency f.sub.G applied to the stepping input of a delay-increment counter to determine character speed. In response to character codes transmitted from an input unit via a read/write memory, the character generator emits binary signals combinable with horizontal and vertical sync pulses into a video signal fed to the monitor. The counter is reset upon every horizontal sync pulse to have a modulus n equal to the contents of a total-delay counter stepped by the vertical sync pulses and reset after N of the same by a divder calculating the quotient N=T.sub.Z /T.sub.G in response to signals from the selectors coding the periods T.sub.Z, T.sub.G of sequences f.sub.Z, f.sub.G. The delay-increment counter enables the emission of frequency f.sub.Z only after counting n pulses of sequence f.sub.G, whereby the character display is shifted leftwardly upon each vertical sync pulse by distance corresponding to period T.sub.G. Upon completing N counts the total-delay counter enables its own resetting by the divider and increments an initial address of a counter addressing the read/write memory. An arithmetic unit resets the contents n of the total-delay counter upon a change in the selected sequence f.sub.G.

REFERENCES:
patent: 3406387 (1968-10-01), Werme
patent: 3611348 (1971-10-01), Rogers
patent: 3653027 (1972-03-01), Scheer
patent: 3891792 (1975-06-01), Kimura

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