A bidirectional cable network with a mixing tap for...

H - Electricity – 04 – N

Patent

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Details

H04N 7/173 (2006.01) G02B 6/42 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2239263

Noise energy and other undesirable signals are suppressed in a return frequency band of a return path of a bidirection cable network. Data signals in a third frequency band and a prybar signal to a mixing tap. The mixing tap contains a filter for eliminating signals in the return frequency band generated at the user site. The prybar signal is received by the mixing tap and activates a local oscillator. The third band signals and oscillation signals are applied to a mixer in the mixing tap and the third band signals are converted to return band signals. This mixing tap then applies the return band to the return path of the cable network.

L'invention est une méthode d'élimination des bruits at autres signaux indésirables dans la bande de fréquences du trajet de retour d'un réseau câblé bidirectionnel. Des signaux de données compris dans une troisième bande de fréquences et un signal d'activation sont transmis à une prise de mélange. Cette prise est doté d'un filtre servant à éliminer les signaux qui sont engendrés dans la bande de fréquences de retour au site de l'utilisateur. Le signal d'activation est reçu à la prise de mélange où il active un oscillateur local. Les signaux qui se trouvent dans la troisième bande et les signaux d'oscillation sont appliqués à un mélangeur incorporé à la prise de mélange et les signaux de la troisième bande sont convertis en signaux à transmettre dans la bande de retour. La prise de mélange achemine alors les signaux de retour via le trajet de retour du réseau câblé.

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