Abstract: The invention concerns a control device for the emission of carrier currents on a low voltage network, comprising a sensing module (1), by magnetic coupling, for generating from carrier currents detected high frequency signals (shdf), a local oscillator (2) generating a reference frequency radioelectic signal (fr) of a frequency comprised in the signal band (shdf) and a frequency-changing module (3) delivering an audio baseband signal (sbb) based on the (shdf) and (fr) signals. A demodulating circuit (4) delivers a detected low frequency signal (sdbf) based on the baseband signal (sbb) to a transducer circuit (50, 51) generating a sound signal controlling the current carrier frames. The invention is applicable to the implementation and management of current carrier installations on low voltage networks.

Abstract: The invention concerns an interface device of bi-directional connection of current carrying low voltage/radio frequency. It includes a module for coupling currents carrying low voltage/radio frequency delivering in reception signals (rcp) representing reception of carrier currents, a first channel of currents carrying low voltage/radio frequency delivering a signal modulating radio frequency transmission (sme). A coupling device receives in transmission the modulating signal for transmitting a radio frequency signal (srfe) representing the carrier currents, and, in reception, a reception radio frequency signal (srfr) transmitted to a second channel of currents carrying low voltage/radio frequency. The second channel delivers signals (ecp) representing the carrier currents in transmission to the module for transmission of the low voltage line. The invention is useful for house automation and for managing subscriber services.

Abstract: A directional separator-coupler circuit is provided for a medium-frequency carrier current on an electrical line of a low-voltage alternating current network. The separator-coupler circuit comprises a parallel resonant circuit (C,L) inserted into the electrical line and a circuit (E) for the transmission-reception of the carrier currents which are voltage-coupled to the resonant circuit by a connecting circuit (D). The connecting circuit also comprises a series connecting branch (L.sub.d, C.sub.d) which enables current coupling of the transmission-reception circuit (E) and the medium-frequency line, as well as decoupling thereof.