Sync compensated agc system for vsb receiver

H - Electricity – 04 – L

Patent

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H04L 27/08 (2006.01) H04N 5/52 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2239886

A technique and apparatus for developing AGC voltage in a receiver capable of receiving VSB signals that do not have the average magnitudes of the data symbol levels and the sync symbol levels related so as to produce the same average level. One technique eliminates the sync symbols from determination of the AGC voltage. A preferred technique corrects for the different symbol levels (56, 58 and 60) of the sync by multiplexing (54) in an offset at the proper time or multiplying the sync symbols by a compensating factor.

L'invention concerne une technique et un appareil pour développer une tension à commande de gain automatique dans un récepteur permettant de recevoir des signaux de bande latérale résiduelle qui ne présentent pas les grandeurs moyennes des niveaux de symboles de données et des niveaux de symboles de synchronisation concernés de manière à produire le même niveau moyen. Une technique consiste à supprimer les symboles de synchronisation à partir de la détermination de la tension à commande de gain automatique. Une technique préférée consiste à corriger les niveaux de symboles différents (56, 58 et 60) de la synchronisation en assurant un multiplexage (54) dans un décalage au moment opportun ou en multipliant les symboles de synchronisation par un facteur de compensation.

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