Abstract: The invention relates to a method and arrangement for reducing power consumption of a radio communication device. In a solution according to the invention an audio signal is monitored (801) and the radio communication devise is activated to transmit (802) a radio signal containing information of the audio signal only when (803) the audio signal contains speech. The power consumption of the radio communication device can be reduced without a need for manual control actions that could limit the freedom of action of a person who is using of the radio communication device.

Abstract: A self-contained breathing apparatus safety mask, a system and a method includes a radio frequency identification tag reader arranged to communication with a radio frequency tag so that the breathing apparatus can obtain an identification of the user for wireless radio group communication with breathing apparatuses of other users. The identifier contains information for establishing and changing the group communication parameters. The system also includes a remote speaker microphone in short range radio communication with the mask. The remote speaker microphone may be connected to private mobile system.

Abstract: A method and arrangement for connecting an ad-hoc communication network (101) to a permanent communication network (102) via a half-duplex communication link (140). The ad-hoc communication network is established between communication devices (103-106) and a gateway device (107) using a routing protocol that is run in the gateway device and in the communication devices. Relaying of data between the ad-hoc communication network and the permanent communication network is controlled by setting the following relaying operations into a pre-determined order of mutual priority: relaying data from the ad-hoc communication network to the permanent communication network and relaying data from the permanent communication network to the ad-hoc communication network. The pre-determined order of priority facilitates data transfer via the half-duplex communication link between the permanent communication network and the ad-hoc communication network that can be either a full-duplex network or a half-duplex network.

Abstract: The invention relates a method and arrangement for presenting visual information responsive to an audio signal. A solution according to the invention comprises an audio detector (101) arranged to detect an arrival direction of the audio signal, a display device (103) arranged to generate visual information (108) indicating the arrival direction of the audio signal, and a position sensor (104) arranged to generate a position signal indicating a change of a rotational position of a display surface of the display device. The display device is arranged to update the visual information according to the position signal. The solution is able to generate a visual indicator that indicates a direction from which an audio signal having a limited temporal duration, e.g. a gunshot voice, has arrived with respect to a changing rotational position of the display surface.

Abstract: The invention relates to a method and arrangement for extending viewing capability of a user who is looking through a transparent sheet. The transparent sheet can be, for example, a lens of goggles, an eye shield of a breathing mask, a visor of a helmet, or a windscreen of a vehicle. The arrangement comprises a receiver device (101) adapted to receive electromagnetic radiation, e.g. infrared radiation, that is outside the visual spectral region. The arrangement comprises a converter device (102) adapted to produce an electrical signal (111) at least partly on the basis of information carried by the received electromagnetic radiation. The arrangement comprises a transparent sheet (103) that has an electrically switchable diffractive optical area (104) adapted to display information carried by the electrical signal.

Abstract: The invention relates to a method and arrangement for reducing power consumption of a radio communication device. In a solution according to the invention an audio signal is monitored (801) and the radio communication devise is activated to transmit (802) a radio signal containing information of the audio signal only when (803) the audio signal contains speech. The power consumption of the radio communication device can be reduced without a need for manual control actions that could limit the freedom of action of a person who is using of the radio communication device.

Abstract: An alarm system includes a detector arranged in connection with a holster for carrying a force instrument, the detector detecting, if the force instrument is removed from the holster; information on the situation is produced on the basis of the identification and relayed to the user's control room so that a message is relayed to the communication unit of the user of the force instrument, the communication unit relaying the message further to the control room via a base station. The detector is adapted to detect the existence of the force instrument in the holster, its missing from or its movement out of or into the holster. A detector-cpu is adapted to receive a signal or message from the detector and forms at least part of the contents of the message on the basis of the signal or message, the detector-cpu being adapted to control the communication unit to transmit the message.

Abstract: A self-contained breathing apparatus safety mask, a system and a method is disclosed providing radio frequency identification tag reader arranged to communication with a radio frequency tag so that the breathing apparatus can obtain an identification of the user for wireless radio group communication with breathing apparatuses of another users. The identifier contains information for establishing and changing the group communication parameters. The system comprises also a remote speaker microphone in short range radio communication with the mask. The RSM may be connected to private mobile system.

Abstract: An alarm system includes a detector arranged in connection with a holster for carrying a force instrument, the detector detecting, if the force instrument is removed from the holster; information on the situation is produced on the basis of the identification and relayed to the user's control room so that a message is relayed to the communication unit of the user of the force instrument, the communication unit relaying the message further to the control room via a base station. The detector is adapted to detect the existence of the force instrument in the holster, its missing from or its movement out of or into the holster. A detector-cpu is adapted to receive a signal or message from the detector and forms at least part of the contents of the message on the basis of the signal or message, the detector-cpu being adapted to control the communication unit to transmit the message.