System for use in television receivers for providing improved sh

Details System for use in television receivers for providing improved sh System for use in television receivers for providing improved sh

1974-11-05

1976-04-06

Libman, George H.

Telegraphy

Systems

Simplex-reversing periodic

178DIG34, 315382, H04N 544

Patent

active

039491668

ABSTRACT:
For improving the sharpness of images produced on the screen of a cathode ray tube in a television receiver or other video signal reproducing device, a control signal is produced to vary in response to transient changes in the level of a video signal by which each electron beam in the cathode ray tube is density-modulated, and such control signal is supplied to a beam focusing electrode of the cathode ray tube so as to control the shape of a beam landing spot on the screen and thereby to prevent the image on the screen from becoming vague at its contours.

REFERENCES:
patent: 2784342 (1957-05-01), Van Overbeek
patent: 2994803 (1961-08-01), Goldberg
patent: 3038101 (1962-06-01), Schlesinger
McMann et al., Improved Signal Processing Techniques for Color Television Broadcasting, Journal of the SMPTE, Vol. 77, Mar. 1968, p. 221.

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