Raster display smoothing technique

Details Raster display smoothing technique Raster display smoothing technique

1985-08-23

1987-06-30

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340747, 340722, G09G 114

Patent

active

046774319

ABSTRACT:
An apparatus and method for smoothing the reproduction of digitized waveforms on a raster scan line display by providing control signals which increase and decrease the electron beam pattern along the scan line in a trapezoidal pattern which is representative of the amplitude of the sampled waveform along that scan line. A microprocessor provides a plurality of digital signals which define the slopes of the increasing and decreasing ramps of the trapazoids and their starting points along the scan line. The digital signals for an entire frame of scan lines are stored during the frame blanking interval of the display and are accessed for each scan line during the scan line blanking interval. The digital signals are stored in a random access memory (RAM) at raster scan line addresses provided by the processor through a scroll counter and at digital signal addresses provided through a display controller. During scan line blanking intervals the scroll counter incrementally steps through raster scan line addresses starting with the last address provided by the processor during the storing of the data.

REFERENCES:
patent: 4212009 (1980-07-01), Adleman et al.
patent: 4318097 (1982-03-01), Oura
patent: 4586037 (1986-04-01), Rosener et al.
patent: 4591844 (1986-05-01), Hickin et al.
patent: 4604614 (1986-08-01), Farr et al.
patent: 4612540 (1986-09-01), Pratt

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