Abstract: The portable communication terminal for communicating on at least two independent radio networks, comprises, in a single housing: Communication means (47, 49) by time multiplexing on a single radio channel, TDMA type full-duplex, for audio communication in “conference” and “hands-free” mode on a first autonomous network without infrastructure, Access means (43, 50) for half-duplex audio communication on a second autonomous network, independent from the first full-duplex network, A connection to a microphone (41) and a speaker (52), A wireless connection for a cellular telephone network, At least one pushbutton (45) for switching the communication of the microphone and the loudspeaker to and from the communication on the first network, the second network or the cellular telephone network by means of electronic switching circuits and An electronic codec type audio signal mixer (42, 51) having a plurality of inputs and outputs, configured to mix half-duplex communications on the full-duplex local area network

Abstract: The portable communication terminal for communicating on at least two independent radio networks, comprises, in a single housing: Communication means (47, 49) by time multiplexing on a single radio channel, TDMA type full-duplex, for audio communication in “conference” and “hands-free” mode on a first autonomous network without infrastructure, Access means (43, 50) for half-duplex audio communication on a second autonomous network, independent from the first full-duplex network, A connection to a microphone (41) and a speaker (52), A wireless connection for a cellular telephone network, At least one pushbutton (45) for switching the communication of the microphone and the loudspeaker to and from the communication on the first network, the second network or the cellular telephone network by means of electronic switching circuits and An electronic codec type audio signal mixer (42, 51) having a plurality of inputs and outputs, configured to mix half-duplex communications on the full-duplex local area network

Abstract: A communication terminal having a digital communication circuit and an automatic synchronizer. The digital communication circuit utilizes time division multiplexing in a single radio channel, selectable in a frequency band. The terminal implements a wireless communication in a conference and hands-free mode on an autonomous network between at least two wearers of similar terminals. The automatic synchronizer synchronizes to the signal of other terminal in the group to synchronize its internal time reference. This ensures the continuity of communication between each terminal in the group within a range of each other, even when the communication is lost with other terminals in the group. No particular terminal is required to maintain the synchronization in the group.

Abstract: A communication terminal having a digital communication circuit and an automatic synchronizer. The digital communication circuit utilizes time division multiplexing in a single radio channel, selectable in a frequency band. The terminal implements a wireless communication in a conference and hands-free mode on an autonomous network between at least two wearers of similar terminals. The automatic synchronizer synchronizes to the signal of other terminal in the group to synchronize its internal time reference. This ensures the continuity of communication between each terminal in the group within a range of each other, even when the communication is lost with other terminals in the group. No particular terminal is required to maintain the synchronization in the group.