Method of radio telecommunication and device for implementation thereof

Claim 1

A device for radio telecommunication in the simplex mode or in the alternate duplex mode between central stations and a certain number of secondary stations, this device being provided in each of said stations and comprising a transmitter-received stage (2), a microphone-loudspeaker assembly (3), connectors (8,9) for connecting respectively to the transmitter-receiver and to the microphone-loudspeaker assembly, an alphanumeric luminous display device (11), a microprocessor (13) containing a PROM program memory and connected on the one hand to a data introduction stage (14) and on the other hand to a transmission memory (15) connected to the transmitter (2a) of said transmitter-receiver stage (2) through a modulator-demodulator (MODEM) (16) and through a said connector (8) via a line (17) for information transmitted at low frequency (INFEBF), a reception memory (18) connected to the receiver (2b) of said transmitter-receiver stage (2) through the MODEM (16) via a line (18) for information received at low frequency (INFEBF), said reception memory (18) being also connected to a stage (19) for indicating messages received via the microprocessor (13) and comprising a voice synthesizer (21), the output of which is connected via a line BFHP to the loudspeaker HP of said microphone-loudspeaker assembly (3), said assembly (3) comprising further a microphone M from which extends a low-frequency transmission line BFE which returns to the line (17) which terminates at the transmitter (2a) via another said connector (9), via a control unit CTR and a multiwire cable (22) so as to return to the low-frequency information line (17), said assembly (3) also comprising a control unit (23) from which extend call connections AP and alternate transmission connections AL which terminates via the same channel at the transmitter (2a), said control unit CTR being in a mutually dependent relationship with the microprocessor (13) and receiving via a multiwire cable (24), service data derived from the receiver (2b), namely a received-code data item (25), a free-channel data item (26) and a data item (27) indicating the presence of a low-frequency message which is intended for the loudspeaker, said microprocessor (13) further comprising a counter K which counts the pulses of a clock H and is connected to the transmission memory (15) by means of a dating connection (D).

Claim 2

A device for radio telecommunication in the simplex mode or in the alternate duplex mode between central stations and a certain number of secondary stations, this device being provided in each of said stations and comprising a transmitter-received stage (2), a microphone-loudspeaker assembly (3), connectors (8,9) for connecting respectively to the transmitter-receiver and to the microphone-loudspeaker assembly, an alphanumeric luminous display device (11), a microprocessor (13) containing a PROM program memory and connected on the one hand to a data introduction stage (14) and on the other hand to a transmission memory (15) connected to the transmitter (2a) of said transmitter-receiver stage (2) through a modulator-demodulator (MODEM) (16) and through a said connector (8) via a line (17) for information transmitted at low frequency (INFEBF), a reception memory (18) connected to the receiver (2b) of said transmitter-receiver stage (2) through the MODEM (16) via a line (18) for information received at low frequency (INFEBF), said reception memory (18) being also connected to a stage (19) for indicating messages received via the microprocessor (13) and comprising a voice synthesizer (21), the output of which is connected via a line BFHP to the loudspeaker HP of said microphone-loudspeaker assembly (3), said assembly (3) comprising further a microphone M from which extends a low-frequency transmission line BFE which returns to the line (17) which terminates at the transmitter (2a) via another said connector (9), via a control unit CTR and a multiwire cable (22) so as to return to the low-frequency information line (17), said assembly (3) also comprising a control unit (23) from which extend call connections AP and alternate transmission connections AL which terminates via the same channel at the transmitter (2a), said control unit CTR being in a mutually dependent relationship with the microprocessor (13) and receiving via a multiwire cable (24), service data derived from the receiver (2b), namely a received-code data item (25), a free-channel data item (26) and a data item (27) indicating the presence of a low-frequency message which is intended for the loudspeaker, said microprocessor (13) further comprising a counter K which counts the pulses of a clock H and is connected to the transmission memory (15) by means of a dating connection (D).