H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/78—Circuit arrangements in which low-frequency speech signals proceed in one direction on the line, while speech signals proceeding in the other direction on the line are modulated on a high-frequency carrier signal
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Combination conventional telephony and high-bit-rate digital channel transmission system comprising high pass filters which comprise both first order and second order high pass filters
Dispositif de radiocommunication mettant en oeuvre au moins deux antennes, respectivement pour les radiocommunications et la radiolocalisation et systeme correspondant