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1. (WO1991003129) SCANNING-PATTERN CORRECTION CIRCUIT FOR A TELEVISION SET

Pub. No.:    WO/1991/003129    International Application No.:    PCT/EP1990/001332
Publication Date: Mar 7, 1991 International Filing Date: Aug 14, 1990
IPC: H04N 3/233
H04N 9/28
Applicants: DEUTSCHE THOMSON-BRANDT GMBH
GLEIM, Günter
HEIZMANN, Friedrich
SCHEMMANN, Heinrich
CHAUVIN, Jacques
Inventors: GLEIM, Günter
HEIZMANN, Friedrich
SCHEMMANN, Heinrich
CHAUVIN, Jacques
Title: SCANNING-PATTERN CORRECTION CIRCUIT FOR A TELEVISION SET
Abstract:
In order to correct a scanning pattern, in particular as regards convergence, correction values for the crossing points in the scanning pattern are stored in a memory. The aim of the invention is to provide a simple circuit for interpolation between two correction values, which can be adapted in particular to different numbers of lines (N). A delta voltage (x) is generated for interpolation from one correction value (K1) to the next (K2) by means of a simple digital circuit comprising an adder (2), a register (3) and a D/A converter (8). The circuit is particularly suitable for convergence correction in a rear-projection TV set.