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.

Abstract: A garment or accessory includes: at least one sensor for measuring at least one physiological parameter of the wearer of the garment or accessory; at least one element for determining the stress as a function of at least one measurement of the physiological parameter; and a remote transmission link, by wireless element, of data representative of measurements from each sensor. In some embodiments, a sensor is adapted to measure heart rate, the blood's oxygen saturation rate and the body temperature of the wearer, preferably by pinching the lobe of an ear of the wearer. For example, this sensor is an optical sensor that uses two separate wavelengths. In some embodiments, the element for determination of the composite stress determines the composite stress as function of the variability of heart rate, the body temperature, the heart rate of the user, and the voice and/or orientation.