An upconverter for a television signal headend distribution...

H - Electricity – 04 – N

Patent

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Details

H04N 7/08 (2006.01) H04J 1/06 (2006.01) H04N 5/40 (2006.01) H04N 5/46 (2006.01) H04N 7/10 (2006.01) H04N 7/24 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2364345

An upconverter for converting IF television signals to VHF or UHF signals prior to broadcast is configured to process either analog or digital televison signals. The upconverter identifies the type of incoming television signal and generates an appropriate reference signal depending on whether the incoming televison signal is digital or analog. In an analog format, the reference signal is used by the modulator generating the IF signal to synchronize phase with the signals output by various other upconverters. In a digital format, the reference signal is used, for example, as a test signal for the upconversion circuit.

L'invention porte sur un convertisseur éleveur de fréquence permettant de convertir des signaux de télévision à fréquence intermédiaire en signaux VHF ou UHF avant diffusion. Ce convertisseur est configuré de manière à traiter des signaux de télévision analogiques ou numériques et il identifie le type de signal entrant et génère un signal de référence approprié en fonction de la nature du signal entrant, à savoir numérique ou analogique. Dans un format analogique, le signal de référence est utilisé par le modulateur générant le signal à fréquence intermédiaire de façon à synchroniser la phase avec les signaux émis par divers convertisseurs éleveurs de fréquence. Dans un format numérique, le signal de référence est utilisé, par exemple, comme signal de test pour le circuit de conversion élévation de fréquence.

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