Abstract: According to one embodiment, a radio communication apparatus includes a first reservation slot securing unit, a second reservation slot securing unit and a radio communication unit. The first reservation slot securing unit secures a first reservation slot for performing radio communication through a first transmission output in a radio communicable slot to be shared in time division in a group by adjustment in periodically formed beacon slots. The second reservation slot securing unit secures a second reservation slot for performing radio communication through a second transmission output smaller than the first transmission output in the radio-communicable period, when the first reservation slot securing unit fails in securing the first reservation slot. And the radio communication unit performs radio communication through the first transmission output or the second transmission output by using at least either the first reservation slot or the second reservation slot.

Abstract: According to one embodiment, a wireless communication apparatus includes a reserved period ensuring unit which ensures a reserved period to be occupied for communication in a communicable period time-shared in a group by adjustment in a periodic beacon period, a wireless communication unit which performs wireless communication using the reserved period, a group generating unit which generates a new group in which a periodic beacon period is formed not to temporally overlap the beacon period and causes the apparatus to belong to the new group, when the reserved period ensuring unit fails to ensure the reserved period, and a controlling unit which controls the reserved period ensuring unit to ensure the reserved period not to temporally overlap the beacon period of the original group in the communicable period of the new group to which the apparatus is caused to belong by the group generating unit.

Abstract: A communication apparatus has a speaker, a headband which connects to the speaker at an end thereof, a wireless communication module coupled to the speaker, and an antenna arranged on the headband, and coupled to said wireless communication module.

Abstract: A security system includes an analyzer configured to perform voiceprint analysis for bark of an animal, and a communication unit configured to transmit information representing a peripheral situation around the animal to a terminal when the analyzer detects a voiceprint representing a threat.

Abstract: When an automatic battery detector detects that the remaining capacity of a battery has become lower than a predetermined value, a central processing controller lengthens the continuous operation time by reducing power consumption. The central processing controller controls a radio communication device to switch the operation mode from class 2 to class 3. Class 2 provides a high output level, and class 3 provides a low output level. Alternatively or additionally, the central processing controller controls a D/A conversion amplifier circuit to turn off a Dolby system.

Abstract: A communication apparatus has a speaker, a headband which connects to the speaker at an end thereof, a wireless communication module coupled to the speaker, and an antenna arranged on the headband, and coupled to said wireless communication module.