Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-11-01
1976-09-14
Griffin, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
178DIG25, 178DIG34, 313421, H04N 514
Patent
active
039808190
ABSTRACT:
Method and apparatus for enhancing the edges of video images displayed on a cathode ray tube. The scanning velocity of the cathode ray tube electron beam is modulated so as to counteract the blurring effect which occurs when a video amplitude transition causes an increase in beam current and a corresponding increase in the size of the electron beam spot at the screen of the cathode ray tube. When such a transition occurs, the beam is deflected in the direction of normal scan at a rate which corresponds to the rate of change in the size of the diameter of the spot so as to substantially arrest the spot edge, thereby causing a displayed video transition to have a better defined vertical edge. Horizontal edges of images are sharpened by auxiliary vertical deflection of the electron beam. Image edges are further improved by a video peaking scheme which eliminates the large spot size growth usually associated with large amplitude video transitions which have been peaked.
REFERENCES:
patent: 2678964 (1954-05-01), Loughlin
patent: 3377425 (1968-04-01), Buzan
patent: 3479453 (1969-11-01), Townsend
patent: 3629498 (1971-12-01), Tan
patent: 3798353 (1974-03-01), Illetschko
patent: 3830958 (1974-08-01), Fuse et al.
patent: 3859544 (1975-01-01), Nero
Griffin Robert L.
Masinick Michael A.
Pederson John J.
Zenith Radio Corporation
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