Hdtv receiver having fast digital if agc and analog rf agc

Details Hdtv receiver having fast digital if agc and analog rf agc Hdtv receiver having fast digital if agc and analog rf agc

H - Electricity

04

N

H04N 5/52 (2006.01) H04N 5/455 (2006.01) H04N 5/50 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2384452

An HDTV receiver includes an AGC system that develops an RF AGC voltage that is derived on an analog basis and an IF AGC voltage that is derived on a digital basis. The digital voltage is developed from an error signal that is comprises the most significant bits of a continuously operated large accumulator (54) that is supplied with the algebraically combined output of the digital signal and an AGC reference number (52). A steady rest having cams for adjusting both vertical and the horizontal position of the centerline of a cylindrical workplace.

Cette invention concerne un récepteur de télévision haute définition comprenant un système à commande automatique de gain (CAG) qui produit une tension CAG haute fréquence (HF) de type analogique et une tension CAG de fréquence moyenne (FI) de type numérique. La tension numérique découle d'un signal d'erreur comprenant les bits les plus importants d'un gros accumulateur (54) à fonctionnement continu qui est alimenté par la sortie combinée au plan algébrique du signal numérique et d'un numéro de référence (52) CAG.

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