Cathode ray tube character smoother

Details Cathode ray tube character smoother Cathode ray tube character smoother

1979-07-06

1981-11-03

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

315386, 340744, G08B 536

Patent

active

042988675

ABSTRACT:
Disclosed is a cathode ray tube (CRT) character generator system which includes delay apparatus for storing digitally generated raster control signals. Raster control signals thus stored are combined with more recent raster control signals in an analog fashion in order to generate a composite, or interpolated, raster control signal which is resolved in horizontal time increments of finer resolution than that obtainable from the original digitally generated raster control signal. Raster control signals of prior horizontal scan lines are also compared with those of more recent horizontal scan lines in order to detect the steepness of the slope, if any, along the edges of the character to be displayed. A rise-time control signal is generated to control the rise and fall times of the interpolated raster control signal in proportion to this detected slope. The smoothed interpolated raster control signal thus formed turns the sweeping electron beam of the CRT display system on and off in a manner that smooths the sloping character edges that would otherwise appear jagged, or stair-case like.

REFERENCES:
patent: 3680076 (1972-07-01), Duffek et al.
patent: 3697976 (1972-10-01), Fenton
patent: 3812491 (1974-05-01), Barraclough et al.
patent: 3894292 (1975-07-01), Wilkinson et al.
patent: 3969716 (1976-07-01), Roberts
patent: 4095216 (1978-06-01), Spicer

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