H - Electricity – 04 – N
Patent
H - Electricity
04
N
355/7
H04N 9/28 (2006.01) H01J 29/51 (2006.01)
Patent
CA 1196730
-27- Abstract of the Disclosure An apparatus and method of providing vertical smoothing of convergence correction signals in a digital convergence system is disclosed. The surface of a cath- ode ray tube is subdivided into a matrix including a plurality of intersecting rows and columns and having a plurality of intersections corresponding thereto. A value is assigned to each intersection of a row and a column of said matrix. An electron beam traces a plu- rality of scan lines within each of the rows of the matrix. For each scan line within a row of the matrix, a convergence correction signal is synthesized using the plurality of values associated with the plurality of intersections in said row. A plurality of horizontal discontinuities are present in the convergence correc- tion signal as a result of the different magnitudes asso- ciated with the plurality of values used to synthesize the convergence correction signal. Using conventional filtering techniques, the impact of the horizontal dis- continuities in the convergence correction signal may be minimized thereby providing horizontal smoothing of the convergence correction signal. When the electron beam begins tracing the plurality of scan lines in the next, subsequent row of the matrix, a vertical discontinuity is produced, i.e., a gap or an overlap between groups of scan lines traced by the electron beam. The impact of these vertical discontinuities can be minimized by pro- viding vertical smoothing of the convergence correction signal. This vertical smoothing is accomplished by using a linear interpolator to interpolate between values asso- ciated with two adjacent, vertically oriented intersec- tions of said matrix, and by progressively changing the magnitude of the convergence correction signal in re- sponse thereto. Vertical smoothing of the convergence correction signal is accomplished and the vertical dis- continuities between groups of scan lines traced by the electron beams are eliminated.
431968
Kirby Eades Gale Baker
Tektronix Inc.
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