Horizontal automatic frequency control (afc) circuit

Details Horizontal automatic frequency control (afc) circuit Horizontal automatic frequency control (afc) circuit

G - Physics

09

G

G09G 1/04 (2006.01) H04N 3/227 (2006.01) H04N 5/12 (2006.01)

Patent

CA 2352546

A horizontal automatic frequency control (AFC) used in a display having a display device such as a cathode ray tube (CRT) is provided. The AFC circuit reduces a horizontal distortion and horizontal jitter on the CRT. The AFC circuit includes a video signal processor for demodulating and converting an input video signal into a desired signal such as a YUV signal or an RGB signal, a synchronous separator for separating a synchronizing signal from the video signal, a dual-port line memory, an Hout generator for generating a horizontal driving pulse which drives a horizontal deflection yoke, a read clock generator for generating a read clock (RCK) signal which is synchronized in phase with a flyback pulse, and a horizontal deflection driver for controlling horizontal deflection of the CRT and generating the flyback pulse. The line memory absorbs a horizontal position change of a displayed image caused by a temperature change or a load change in the horizontal deflection driver.

Il est décrit un régulateur de fréquence automatique (RFA) horizontal servant dans un écran d'affichage comportant un dispositif d'affichage, tel un tube cathodique. Le circuit RFA réduit la distorsion et la gigue horizontales sur le RFA. Ce circuit comprend un processeur de signal vidéo qui sert à démoduler un signal vidéo d'entrée et à le convertir en un signal souhaité, tel un signal YUV ou un signal RVB; un séparateur synchrone pour séparer un signal de synchronisation du signal vidéo; un générateur Hout pour générer une impulsion de commande qui commande une bobine de déviation horizontale; et un et à générer l'impulsion de retour. La mémoire absorbe le changement de position horizontale d'une image affichée que cause un changement de température ou un changement de charge dans la commande de déviation horizontale.

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