Data comparison agc system for vsb receiver

H - Electricity – 04 – L

Patent

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H04L 27/08 (2006.01)

Patent

CA 2239888

A technique and apparatus for developing AGC voltage in a receiver (fig. 1) capable of receiving VSB signals (RF IN) that do not have the data symbol levels and the sync symbol levels related so as to produce the same average magnitude level. Successive portions of the signal are accumulated, stored (38-44) and compared (46) with the smaller of the samples to be used to develop the AGC voltage. By comparing the first and third of three successive samples, the effect of the larger than desired sync levels in the over-the-air VSB signals is completely eliminated.

L'invention concerne une technique et un appareil pour développer une tension à commande de gain automatique dans un récepteur (figure 1) permettant de recevoir des signaux de bande latérale résiduelle (RF IN) qui ne présentent pas les niveaux de symboles de données et les niveaux de symboles de synchronisation concernés pour produire le même niveau de grandeur moyen. Les parties successives du signal sont cumulées, mémorisées (38-44) et comparées (46) avec le plus petit des échantillons à utiliser pour développer la tension à commande de gain automatique. En comparant le premier et le troisième des trois échantillons successifs, l'effet du niveau de synchronisation plus grand que nécessaire dans les signaux à bande latérale résiduelle dans l'air est totalement supprimé.

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