Digital waveform generator

Details Digital waveform generator Digital waveform generator

1986-07-09

1987-08-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, H01J 2956

Patent

active

046879730

ABSTRACT:
In a cathode ray tube display system, correction factors for X and Y position, astigmatism, focus and shading are recorded for preselected locations in digital memory circuits. Those correction factors bordering the actual beam position are selected and are converted to analog form. The correction factors applied to the system are determined by analogue interpolation, that is, the correction factors are combined in proportion to the proximity of the beam relative to those preselected locations where the correction factors were recorded. Use is made of resistance ladders and multiplexers in the interpolation circuits.

REFERENCES:
patent: 4203051 (1980-05-01), Hallett et al.
patent: 4203054 (1980-05-01), Sowter
patent: 4287506 (1981-09-01), Richards
patent: 4401922 (1983-08-01), Kamata et al.
patent: 4472707 (1984-09-01), Wilensky et al.
patent: 4491926 (1985-01-01), Richards
patent: 4620136 (1986-10-01), Bolger
Farrell et al, Design Handbook for Imagery Interpretation Equipment, Boeing Aerospace Co., pp. 4.4-23 and 4.4-24, Feb. 1984.

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