H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/03 (2006.01) H04L 12/28 (2006.01) H04L 25/24 (2006.01) H04N 7/10 (2006.01)
Patent
CA 2192610
A method and device for use with a communication system having a single cable line containing externally transmitted data within a fixed frequency band for providing interaction between a transmitting terminal device and a receiving terminal device without disrupting the externally transmitted data. A modulator is provided for shifting a signal generated by the transmitting device to a frequency not receivable by the receiving device. A low pass filter passes the shifted signal to a block converter which converts the signal to a frequency outside of the fixed frequency band but which is receivable by the receiving device. An amplifier is provided for amplifying the converted signal and the externally transmitted data for receipt of the amplified signal by the receiving device.
'invention est une méthode et un dispositif servant à établir l'interaction entre un dispositif terminal de transmission et un dispositif terminal de réception sans perturber les données transmises extérieurement dans un système de communication à ligne unique véhiculant des données transmises extérieurement dans une bande de fréquences fixe. Un modulateur transpose à une fréquence que le dispositif de réception ne peut recevoir les signaux produits par le dispositif de transmission. Un filtre passe-bas transmet le signal transposé à un convertisseur qui convertit ce signal à une fréquence extérieure à la bande de fréquences fixe, mais que le dispositif de réception peut recevoir. Un amplificateur amplifie le signal converti et les données transmises extérieurement pour que le dispositif de réception puisse les recevoir.
At&t Corp.
Kirby Eades Gale Baker
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